diff --git a/Gemfile.lock b/Gemfile.lock
index df66c8fa..6f39d325 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    active_storage_validations (1.1.0)
+    active_storage_validations (1.1.1)
       activejob (>= 5.2.0)
       activemodel (>= 5.2.0)
       activestorage (>= 5.2.0)
@@ -46,6 +46,7 @@ GEM
       zeitwerk (~> 2.3)
     ast (2.4.1)
     builder (3.2.4)
+    byebug (11.1.3)
     coderay (1.1.3)
     combustion (1.3.1)
       activesupport (>= 3.0.0)
@@ -72,6 +73,8 @@ GEM
     mini_magick (4.11.0)
     mini_portile2 (2.5.1)
     minitest (5.14.3)
+    minitest-focus (1.4.0)
+      minitest (>= 4, < 6)
     nokogiri (1.11.3)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
@@ -134,10 +137,12 @@ PLATFORMS
 
 DEPENDENCIES
   active_storage_validations!
+  byebug
   combustion (~> 1.3)
   globalid
   marcel
   mini_magick (>= 4.9.5)
+  minitest-focus (~> 1.4)
   pry
   rubocop
   ruby-vips (>= 2.1.0)
diff --git a/README.md b/README.md
index 97642890..e5e22c29 100755
--- a/README.md
+++ b/README.md
@@ -368,6 +368,11 @@ BUNDLE_GEMFILE=gemfiles/rails_7_0.gemfile bundle exec rake test
 BUNDLE_GEMFILE=gemfiles/rails_next.gemfile bundle exec rake test
 ```
 
+Tips:
+- To focus a specific test, use the `focus` class method provided by [minitest-focus](https://github.com/minitest/minitest-focus)
+- To focus a specific file, use the TEST option provided by minitest, e.g. to only run size_validator_test.rb file you will execute the following command: `bundle exec rake test TEST=test/validators/size_validator_test.rb``
+
+
 ## Known issues
 
 - There is an issue in Rails which it possible to get if you have added a validation and generating for example an image preview of attachments. It can be fixed with this:
diff --git a/active_storage_validations.gemspec b/active_storage_validations.gemspec
index 5563d205..43073dfd 100644
--- a/active_storage_validations.gemspec
+++ b/active_storage_validations.gemspec
@@ -19,6 +19,7 @@ Gem::Specification.new do |s|
   s.files = Dir['{app,config,db,lib}/**/*', 'MIT-LICENSE', 'Rakefile', 'README.md']
 
   %w[activejob activemodel activestorage activesupport].each { |rails_subcomponent| s.add_dependency rails_subcomponent, '>= 5.2.0' }
+  s.add_development_dependency 'minitest-focus', "~> 1.4"
   s.add_development_dependency 'combustion', "~> 1.3"
   s.add_development_dependency 'mini_magick', ">= 4.9.5"
   s.add_development_dependency 'ruby-vips', ">= 2.1.0"
diff --git a/gemfiles/rails_6_0.gemfile.lock b/gemfiles/rails_6_0.gemfile.lock
index 0fc90c6d..27146090 100644
--- a/gemfiles/rails_6_0.gemfile.lock
+++ b/gemfiles/rails_6_0.gemfile.lock
@@ -70,9 +70,15 @@ GEM
     mini_magick (4.11.0)
     mini_portile2 (2.8.0)
     minitest (5.16.3)
+    minitest-focus (1.4.0)
+      minitest (>= 4, < 6)
     nokogiri (1.13.8)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
+    nokogiri (1.13.8-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.13.8-x86_64-linux)
+      racc (~> 1.4)
     parallel (1.20.1)
     parser (3.0.0.0)
       ast (~> 2.4.1)
@@ -141,6 +147,7 @@ DEPENDENCIES
   globalid
   marcel
   mini_magick (>= 4.9.5)
+  minitest-focus (~> 1.4)
   pry
   rubocop
   ruby-vips (>= 2.1.0)
diff --git a/gemfiles/rails_6_1.gemfile.lock b/gemfiles/rails_6_1.gemfile.lock
index 648148ea..3b0dd91a 100644
--- a/gemfiles/rails_6_1.gemfile.lock
+++ b/gemfiles/rails_6_1.gemfile.lock
@@ -72,9 +72,15 @@ GEM
     mini_magick (4.11.0)
     mini_portile2 (2.8.0)
     minitest (5.16.3)
+    minitest-focus (1.4.0)
+      minitest (>= 4, < 6)
     nokogiri (1.13.8)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
+    nokogiri (1.13.8-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.13.8-x86_64-linux)
+      racc (~> 1.4)
     parallel (1.20.1)
     parser (3.0.0.0)
       ast (~> 2.4.1)
@@ -142,6 +148,7 @@ DEPENDENCIES
   globalid
   marcel
   mini_magick (>= 4.9.5)
+  minitest-focus (~> 1.4)
   pry
   rubocop
   ruby-vips (>= 2.1.0)
diff --git a/gemfiles/rails_7_0.gemfile.lock b/gemfiles/rails_7_0.gemfile.lock
index 382adb9e..36fd2e48 100644
--- a/gemfiles/rails_7_0.gemfile.lock
+++ b/gemfiles/rails_7_0.gemfile.lock
@@ -68,6 +68,8 @@ GEM
     mini_mime (1.1.2)
     mini_portile2 (2.8.0)
     minitest (5.16.3)
+    minitest-focus (1.4.0)
+      minitest (>= 4, < 6)
     nokogiri (1.13.8)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
@@ -137,6 +139,7 @@ DEPENDENCIES
   globalid
   marcel
   mini_magick (>= 4.9.5)
+  minitest-focus (~> 1.4)
   pry
   rubocop
   ruby-vips (>= 2.1.0)
diff --git a/gemfiles/rails_next.gemfile.lock b/gemfiles/rails_next.gemfile.lock
index 15aa0f41..3bd981fc 100755
--- a/gemfiles/rails_next.gemfile.lock
+++ b/gemfiles/rails_next.gemfile.lock
@@ -130,6 +130,8 @@ GEM
     mini_mime (1.1.2)
     mini_portile2 (2.8.2)
     minitest (5.15.0)
+    minitest-focus (1.4.0)
+      minitest (>= 4, < 6)
     net-imap (0.2.3)
       digest
       net-protocol
@@ -215,6 +217,7 @@ DEPENDENCIES
   globalid
   marcel
   mini_magick (>= 4.9.5)
+  minitest-focus (~> 1.4)
   pry
   rails!
   rubocop
diff --git a/lib/active_storage_validations/aspect_ratio_validator.rb b/lib/active_storage_validations/aspect_ratio_validator.rb
index a1959de2..50d29dc6 100644
--- a/lib/active_storage_validations/aspect_ratio_validator.rb
+++ b/lib/active_storage_validations/aspect_ratio_validator.rb
@@ -1,11 +1,13 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
 require_relative 'metadata.rb'
 
 module ActiveStorageValidations
   class AspectRatioValidator < ActiveModel::EachValidator # :nodoc
     include OptionProcUnfolding
     include ErrorHandler
+    include Symbolizable
 
     AVAILABLE_CHECKS = %i[with].freeze
     PRECISION = 3
diff --git a/lib/active_storage_validations/attached_validator.rb b/lib/active_storage_validations/attached_validator.rb
index 47921400..6cc25bed 100644
--- a/lib/active_storage_validations/attached_validator.rb
+++ b/lib/active_storage_validations/attached_validator.rb
@@ -1,15 +1,20 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
+
 module ActiveStorageValidations
   class AttachedValidator < ActiveModel::EachValidator # :nodoc:
     include ErrorHandler
+    include Symbolizable
+
+    ERROR_TYPES = %i[blank].freeze
 
     def validate_each(record, attribute, _value)
       return if record.send(attribute).attached?
 
       errors_options = initialize_error_options(options)
 
-      add_error(record, attribute, :blank, **errors_options)
+      add_error(record, attribute, ERROR_TYPES.first, **errors_options)
     end
   end
 end
diff --git a/lib/active_storage_validations/concerns/symbolizable.rb b/lib/active_storage_validations/concerns/symbolizable.rb
new file mode 100644
index 00000000..bd2e7a05
--- /dev/null
+++ b/lib/active_storage_validations/concerns/symbolizable.rb
@@ -0,0 +1,10 @@
+module Symbolizable
+  extend ActiveSupport::Concern
+
+  class_methods do
+    def to_sym
+      validator_class = self.name.split("::").last
+      validator_class.sub(/Validator/, '').underscore.to_sym
+    end
+  end
+end
diff --git a/lib/active_storage_validations/content_type_validator.rb b/lib/active_storage_validations/content_type_validator.rb
index 6a16d0f7..2975e8e1 100644
--- a/lib/active_storage_validations/content_type_validator.rb
+++ b/lib/active_storage_validations/content_type_validator.rb
@@ -1,12 +1,16 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
+
 module ActiveStorageValidations
   class ContentTypeValidator < ActiveModel::EachValidator # :nodoc:
     include OptionProcUnfolding
     include ErrorHandler
+    include Symbolizable
 
     AVAILABLE_CHECKS = %i[with in].freeze
-    
+    ERROR_TYPES = %i[content_type_invalid].freeze
+
     def validate_each(record, attribute, _value)
       return true unless record.send(attribute).attached?
 
@@ -22,7 +26,7 @@ def validate_each(record, attribute, _value)
         next if is_valid?(file, types)
 
         errors_options[:content_type] = content_type(file)
-        add_error(record, attribute, :content_type_invalid, **errors_options)
+        add_error(record, attribute, ERROR_TYPES.first, **errors_options)
         break
       end
     end
diff --git a/lib/active_storage_validations/dimension_validator.rb b/lib/active_storage_validations/dimension_validator.rb
index 7c0f6b77..546a6baf 100644
--- a/lib/active_storage_validations/dimension_validator.rb
+++ b/lib/active_storage_validations/dimension_validator.rb
@@ -1,13 +1,28 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
 require_relative 'metadata.rb'
 
 module ActiveStorageValidations
   class DimensionValidator < ActiveModel::EachValidator # :nodoc
     include OptionProcUnfolding
     include ErrorHandler
+    include Symbolizable
 
     AVAILABLE_CHECKS = %i[width height min max].freeze
+    ERROR_TYPES = %i[
+      image_metadata_missing
+      dimension_min_inclusion
+      dimension_max_inclusion
+      dimension_width_inclusion
+      dimension_height_inclusion
+      dimension_width_greater_than_or_equal_to
+      dimension_height_greater_than_or_equal_to
+      dimension_width_less_than_or_equal_to
+      dimension_height_less_than_or_equal_to
+      dimension_width_equal_to
+      dimension_height_equal_to
+    ].freeze
 
     def process_options(record)
       flat_options = unfold_procs(record, self.options, AVAILABLE_CHECKS)
diff --git a/lib/active_storage_validations/error_handler.rb b/lib/active_storage_validations/error_handler.rb
index d16aafc9..496e5981 100644
--- a/lib/active_storage_validations/error_handler.rb
+++ b/lib/active_storage_validations/error_handler.rb
@@ -3,15 +3,18 @@ module ErrorHandler
 
     def initialize_error_options(options)
       {
-        message: (options[:message] if options[:message].present?)
-      }
+        validator_type: self.class.to_sym,
+        custom_message: (options[:message] if options[:message].present?)
+      }.compact
     end
 
-    def add_error(record, attribute, default_message, **errors_options)
-      message = errors_options[:message].presence || default_message
-      return if record.errors.added?(attribute, message)
+    def add_error(record, attribute, error_type, **errors_options)
+      type = errors_options[:custom_message].presence || error_type
+      return if record.errors.added?(attribute, type)
 
-      record.errors.add(attribute, message, **errors_options)
+      # You can read https://api.rubyonrails.org/classes/ActiveModel/Errors.html#method-i-add
+      # to better understand how Rails model errors work
+      record.errors.add(attribute, type, **errors_options)
     end
 
   end
diff --git a/lib/active_storage_validations/limit_validator.rb b/lib/active_storage_validations/limit_validator.rb
index 802ee8bb..cb5fe9e4 100644
--- a/lib/active_storage_validations/limit_validator.rb
+++ b/lib/active_storage_validations/limit_validator.rb
@@ -1,9 +1,12 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
+
 module ActiveStorageValidations
   class LimitValidator < ActiveModel::EachValidator # :nodoc:
     include OptionProcUnfolding
     include ErrorHandler
+    include Symbolizable
 
     AVAILABLE_CHECKS = %i[max min].freeze
 
diff --git a/lib/active_storage_validations/matchers/attached_validator_matcher.rb b/lib/active_storage_validations/matchers/attached_validator_matcher.rb
index 31486ad2..ff5f2665 100644
--- a/lib/active_storage_validations/matchers/attached_validator_matcher.rb
+++ b/lib/active_storage_validations/matchers/attached_validator_matcher.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/validatable.rb'
+
 module ActiveStorageValidations
   module Matchers
     def validate_attached_of(name)
@@ -7,6 +9,8 @@ def validate_attached_of(name)
     end
 
     class AttachedValidatorMatcher
+      include Validatable
+
       def initialize(attribute_name)
         @attribute_name = attribute_name
         @custom_message = nil
@@ -23,7 +27,10 @@ def with_message(message)
 
       def matches?(subject)
         @subject = subject.is_a?(Class) ? subject.new : subject
-        responds_to_methods && valid_when_attached && invalid_when_not_attached
+        responds_to_methods &&
+          is_valid_when_file_attached? &&
+          is_invalid_when_file_not_attached? &&
+          validate_custom_message?
       end
 
       def failure_message
@@ -42,27 +49,44 @@ def responds_to_methods
           @subject.public_send(@attribute_name).respond_to?(:detach)
       end
 
-      def valid_when_attached
-        @subject.public_send(@attribute_name).attach(attachable) unless @subject.public_send(@attribute_name).attached?
-        @subject.validate
-        @subject.errors.details[@attribute_name].exclude?(error: error_message)
+      def is_valid_when_file_attached?
+        attach_dummy_file unless file_attached?
+        validate
+        is_valid?
       end
 
-      def invalid_when_not_attached
-        @subject.public_send(@attribute_name).detach
-        # Unset the direct relation since `detach` on an unpersisted record does not set `attached?` to false.
-        @subject.public_send("#{@attribute_name}=", nil)
+      def is_invalid_when_file_not_attached?
+        detach_file if file_attached?
+        validate
+        !is_valid?
+      end
+
+      def validate_custom_message?
+        return true unless @custom_message
 
-        @subject.validate
-        @subject.errors.details[@attribute_name].include?(error: error_message)
+        detach_file if file_attached?
+        validate
+        has_an_error_message_which_is_custom_message?
       end
 
-      def error_message
-        @custom_message || :blank
+      def attach_dummy_file
+        dummy_file = {
+          io: Tempfile.new('.'),
+          filename: 'dummy.txt',
+          content_type: 'text/plain'
+        }
+
+        @subject.public_send(@attribute_name).attach(dummy_file)
+      end
+
+      def file_attached?
+        @subject.public_send(@attribute_name).attached?
       end
 
-      def attachable
-        { io: Tempfile.new('.'), filename: 'dummy.txt', content_type: 'text/plain' }
+      def detach_file
+        @subject.public_send(@attribute_name).detach
+        # Unset the direct relation since `detach` on an unpersisted record does not set `attached?` to false.
+        @subject.public_send("#{@attribute_name}=", nil)
       end
     end
   end
diff --git a/lib/active_storage_validations/matchers/concerns/validatable.rb b/lib/active_storage_validations/matchers/concerns/validatable.rb
new file mode 100644
index 00000000..4a31a9e3
--- /dev/null
+++ b/lib/active_storage_validations/matchers/concerns/validatable.rb
@@ -0,0 +1,46 @@
+module Validatable
+  extend ActiveSupport::Concern
+
+  private
+
+  def validate
+    @subject.validate
+  end
+
+  def validator_errors_for_attribute
+    @subject.errors.details[@attribute_name].select do |error|
+      error[:validator_type] == validator_class.to_sym
+    end
+  end
+
+  def is_valid?
+    validator_errors_for_attribute.none? do |error|
+      error[:error].in?(available_errors)
+    end
+  end
+
+  def available_errors
+    [
+      *validator_class::ERROR_TYPES,
+      *error_from_custom_message
+    ].compact
+  end
+
+  def validator_class
+    self.class.name.gsub(/::Matchers|Matcher/, '').constantize
+  end
+
+  def error_from_custom_message
+    associated_validation = @subject.class.validators_on(@attribute_name).find do |validator|
+      validator.class == validator_class
+    end
+
+    associated_validation.options[:message]
+  end
+
+  def has_an_error_message_which_is_custom_message?
+    validator_errors_for_attribute.one? do |error|
+      error[:error] == @custom_message
+    end
+  end
+end
diff --git a/lib/active_storage_validations/matchers/content_type_validator_matcher.rb b/lib/active_storage_validations/matchers/content_type_validator_matcher.rb
index c59075f1..860b4ddb 100644
--- a/lib/active_storage_validations/matchers/content_type_validator_matcher.rb
+++ b/lib/active_storage_validations/matchers/content_type_validator_matcher.rb
@@ -2,6 +2,9 @@
 
 # Big thank you to the paperclip validation matchers:
 # https://github.com/thoughtbot/paperclip/blob/v6.1.0/lib/paperclip/matchers/validate_attachment_content_type_matcher.rb
+
+require_relative 'concerns/validatable.rb'
+
 module ActiveStorageValidations
   module Matchers
     def validate_content_type_of(name)
@@ -9,8 +12,11 @@ def validate_content_type_of(name)
     end
 
     class ContentTypeValidatorMatcher
+      include Validatable
+
       def initialize(attribute_name)
         @attribute_name = attribute_name
+        @allowed_types = @rejected_types = []
         @custom_message = nil
       end
 
@@ -35,20 +41,24 @@ def with_message(message)
 
       def matches?(subject)
         @subject = subject.is_a?(Class) ? subject.new : subject
-        responds_to_methods && allowed_types_allowed? && rejected_types_rejected? && validate_custom_message?
+
+        responds_to_methods &&
+          all_allowed_types_allowed? &&
+          all_rejected_types_rejected? &&
+          validate_custom_message?
       end
 
       def failure_message
         message = ["Expected #{@attribute_name}"]
 
-        if @allowed_types
-          message << "Accept content types: #{allowed_types.join(", ")}"
-          message << "#{@missing_allowed_types.join(", ")} were rejected"
+        if @allowed_types_not_allowed.present?
+          message << "Accept content types: #{@allowed_types.join(", ")}"
+          message << "#{@allowed_types_not_allowed.join(", ")} were rejected"
         end
 
-        if @rejected_types
-          message << "Reject content types: #{rejected_types.join(", ")}"
-          message << "#{@missing_rejected_types.join(", ")} were accepted"
+        if @rejected_types_not_rejected.present?
+          message << "Reject content types: #{@rejected_types.join(", ")}"
+          message << "#{@rejected_types_not_rejected.join(", ")} were accepted"
         end
 
         message.join("\n")
@@ -62,49 +72,46 @@ def responds_to_methods
           @subject.public_send(@attribute_name).respond_to?(:detach)
       end
 
-      def allowed_types
-        @allowed_types || []
+      def all_allowed_types_allowed?
+        @allowed_types_not_allowed ||= @allowed_types.reject { |type| type_allowed?(type) }
+        @allowed_types_not_allowed.empty?
       end
 
-      def rejected_types
-        @rejected_types || []
+      def all_rejected_types_rejected?
+        @rejected_types_not_rejected ||= @rejected_types.select { |type| type_allowed?(type) }
+        @rejected_types_not_rejected.empty?
       end
 
-      def allowed_types_allowed?
-        @missing_allowed_types ||= allowed_types.reject { |type| type_allowed?(type) }
-        @missing_allowed_types.none?
-      end
-
-      def rejected_types_rejected?
-        @missing_rejected_types ||= rejected_types.select { |type| type_allowed?(type) }
-        @missing_rejected_types.none?
+      def type_allowed?(type)
+        attach_file_of_type(type)
+        validate
+        is_valid?
       end
 
-      def type_allowed?(type)
+      def attach_file_of_type(type)
         @subject.public_send(@attribute_name).attach(attachment_for(type))
-        @subject.validate
-        @subject.errors.details[@attribute_name].none? do |error|
-          error[:error].to_s.include?(error_message)
-        end
       end
 
       def validate_custom_message?
         return true unless @custom_message
 
-        @subject.public_send(@attribute_name).attach(attachment_for('fake/fake'))
-        @subject.validate
-        @subject.errors.details[@attribute_name].select{|error| error[:content_type]}.all? do |error|
-          error[:error].to_s.include?(error_message)
-        end
+        attach_invalid_content_type_file
+        validate
+        has_an_error_message_which_is_custom_message?
       end
 
-      def error_message
-        @custom_message || :content_type_invalid.to_s
+      def attach_invalid_content_type_file
+        @subject.public_send(@attribute_name).attach(attachment_for('fake/fake'))
       end
 
       def attachment_for(type)
         suffix = type.to_s.split('/').last
-        { io: Tempfile.new('.'), filename: "test.#{suffix}", content_type: type }
+
+        {
+          io: Tempfile.new('.'),
+          filename: "test.#{suffix}",
+          content_type: type
+        }
       end
     end
   end
diff --git a/lib/active_storage_validations/matchers/dimension_validator_matcher.rb b/lib/active_storage_validations/matchers/dimension_validator_matcher.rb
index 982ca9f7..7eda47fb 100644
--- a/lib/active_storage_validations/matchers/dimension_validator_matcher.rb
+++ b/lib/active_storage_validations/matchers/dimension_validator_matcher.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/validatable.rb'
+
 module ActiveStorageValidations
   module Matchers
     def validate_dimensions_of(name)
@@ -7,6 +9,8 @@ def validate_dimensions_of(name)
     end
 
     class DimensionValidatorMatcher
+      include Validatable
+
       def initialize(attribute_name)
         @attribute_name = attribute_name
         @width_min = @width_max = @height_min = @height_max = nil
@@ -64,9 +68,19 @@ def height(height)
 
       def matches?(subject)
         @subject = subject.is_a?(Class) ? subject.new : subject
+
         responds_to_methods &&
-          width_not_smaller_than_min? && width_larger_than_min? && width_smaller_than_max? && width_not_larger_than_max? && width_equals? &&
-          height_not_smaller_than_min? && height_larger_than_min? && height_smaller_than_max? && height_not_larger_than_max? && height_equals?
+          width_not_smaller_than_min? &&
+          width_larger_than_min? &&
+          width_smaller_than_max? &&
+          width_not_larger_than_max? &&
+          width_equals? &&
+          height_not_smaller_than_min? &&
+          height_larger_than_min? &&
+          height_smaller_than_max? &&
+          height_not_larger_than_max? &&
+          height_equals? &&
+          validate_custom_message?
       end
 
       def failure_message
@@ -134,22 +148,38 @@ def height_equals?
       end
 
       def passes_validation_with_dimensions(width, height, check)
-        @subject.public_send(@attribute_name).attach attachment_for(width, height)
+        mock_dimensions_for(attach_file, width, height) do
+          validate
+          is_valid?
+        end
+      end
+
+      def validate_custom_message?
+        return true unless @custom_message
 
-        attachment = @subject.public_send(@attribute_name)
+        mock_dimensions_for(attach_file, -1, -1) do
+          validate
+          has_an_error_message_which_is_custom_message?
+        end
+      end
+
+      def mock_dimensions_for(attachment, width, height)
         Matchers.mock_metadata(attachment, width, height) do
-          @subject.validate
-          exclude_error_message = @custom_message || "dimension_#{check}"
-          @subject.errors.details[@attribute_name].none? do |error|
-            error[:error].to_s.include?(exclude_error_message) ||
-            error[:error].to_s.include?("dimension_min") ||
-            error[:error].to_s.include?("dimension_max")
-          end
+          yield
         end
       end
 
-      def attachment_for(width, height)
-        { io: Tempfile.new('Hello world!'), filename: 'test.png', content_type: 'image/png' }
+      def attach_file
+        @subject.public_send(@attribute_name).attach(dummy_file)
+        @subject.public_send(@attribute_name)
+      end
+
+      def dummy_file
+        {
+          io: Tempfile.new('Hello world!'),
+          filename: 'test.png',
+          content_type: 'image/png'
+        }
       end
     end
   end
diff --git a/lib/active_storage_validations/matchers/size_validator_matcher.rb b/lib/active_storage_validations/matchers/size_validator_matcher.rb
index b234f978..06618417 100644
--- a/lib/active_storage_validations/matchers/size_validator_matcher.rb
+++ b/lib/active_storage_validations/matchers/size_validator_matcher.rb
@@ -2,6 +2,9 @@
 
 # Big thank you to the paperclip validation matchers:
 # https://github.com/thoughtbot/paperclip/blob/v6.1.0/lib/paperclip/matchers/validate_attachment_size_matcher.rb
+
+require_relative 'concerns/validatable.rb'
+
 module ActiveStorageValidations
   module Matchers
     def validate_size_of(name)
@@ -9,6 +12,8 @@ def validate_size_of(name)
     end
 
     class SizeValidatorMatcher
+      include Validatable
+
       def initialize(attribute_name)
         @attribute_name = attribute_name
         @min = @max = nil
@@ -51,7 +56,13 @@ def with_message(message)
 
       def matches?(subject)
         @subject = subject.is_a?(Class) ? subject.new : subject
-        responds_to_methods && not_lower_than_min? && higher_than_min? && lower_than_max? && not_higher_than_max?
+
+        responds_to_methods &&
+          not_lower_than_min? &&
+          higher_than_min? &&
+          lower_than_max? &&
+          not_higher_than_max? &&
+          validate_custom_message?
       end
 
       def failure_message
@@ -86,17 +97,45 @@ def not_higher_than_max?
         @max.nil? || @max == Float::INFINITY || !passes_validation_with_size(@max + 1)
       end
 
-      def passes_validation_with_size(new_size)
-        io = Tempfile.new('Hello world!')
-        Matchers.stub_method(io, :size, new_size) do
-          @subject.public_send(@attribute_name).attach(io: io, filename: 'test.png', content_type: 'image/pg')
-          @subject.validate
-          exclude_error_message = @custom_message || "file_size_not_"
-          @subject.errors.details[@attribute_name].none? do |error|
-            error[:error].to_s.include?(exclude_error_message)
-          end
+      def passes_validation_with_size(size)
+        mock_size_for(io, size) do
+          attach_file
+          validate
+          is_valid?
         end
       end
+
+      def validate_custom_message?
+        return true unless @custom_message
+
+        mock_size_for(io, -1.kilobytes) do
+          attach_file
+          validate
+          has_an_error_message_which_is_custom_message?
+        end
+      end
+
+      def mock_size_for(io, size)
+        Matchers.stub_method(io, :size, size) do
+          yield
+        end
+      end
+
+      def attach_file
+        @subject.public_send(@attribute_name).attach(dummy_file)
+      end
+
+      def dummy_file
+        {
+          io: io,
+          filename: 'test.png',
+          content_type: 'image/png'
+        }
+      end
+
+      def io
+        @io ||= Tempfile.new('Hello world!')
+      end
     end
   end
 end
diff --git a/lib/active_storage_validations/processable_image_validator.rb b/lib/active_storage_validations/processable_image_validator.rb
index e4c12c7b..ed7390b9 100644
--- a/lib/active_storage_validations/processable_image_validator.rb
+++ b/lib/active_storage_validations/processable_image_validator.rb
@@ -1,11 +1,13 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
 require_relative 'metadata.rb'
 
 module ActiveStorageValidations
   class ProcessableImageValidator < ActiveModel::EachValidator # :nodoc
     include OptionProcUnfolding
     include ErrorHandler
+    include Symbolizable
 
     if Rails.gem_version >= Gem::Version.new('6.0.0')
       def validate_each(record, attribute, _value)
diff --git a/lib/active_storage_validations/size_validator.rb b/lib/active_storage_validations/size_validator.rb
index 67b04350..c90c2207 100644
--- a/lib/active_storage_validations/size_validator.rb
+++ b/lib/active_storage_validations/size_validator.rb
@@ -1,13 +1,29 @@
 # frozen_string_literal: true
 
+require_relative 'concerns/symbolizable.rb'
+
 module ActiveStorageValidations
   class SizeValidator < ActiveModel::EachValidator # :nodoc:
     include OptionProcUnfolding
     include ErrorHandler
+    include Symbolizable
 
     delegate :number_to_human_size, to: ActiveSupport::NumberHelper
 
-    AVAILABLE_CHECKS = %i[less_than less_than_or_equal_to greater_than greater_than_or_equal_to between].freeze
+    AVAILABLE_CHECKS = %i[
+      less_than
+      less_than_or_equal_to
+      greater_than
+      greater_than_or_equal_to
+      between
+    ].freeze
+    ERROR_TYPES = %i[
+      file_size_not_less_than
+      file_size_not_less_than_or_equal_to
+      file_size_not_greater_than
+      file_size_not_greater_than_or_equal_to
+      file_size_not_between
+    ].freeze
 
     def check_validity!
       unless AVAILABLE_CHECKS.one? { |argument| options.key?(argument) }
@@ -39,6 +55,8 @@ def validate_each(record, attribute, _value)
     end
 
     def content_size_valid?(file_size, flat_options)
+      return false if file_size < 0
+
       if flat_options[:between].present?
         flat_options[:between].include?(file_size)
       elsif flat_options[:less_than].present?
diff --git a/test/active_storage_validations_test.rb b/test/active_storage_validations_test.rb
index 5984f350..53601abb 100644
--- a/test/active_storage_validations_test.rb
+++ b/test/active_storage_validations_test.rb
@@ -52,12 +52,14 @@ class ActiveStorageValidations::Test < ActiveSupport::TestCase
     assert_equal u.errors.details, avatar: [
       {
         error: :content_type_invalid,
+        validator_type: :content_type,
         authorized_types: 'PNG',
         content_type: 'text/plain'
       }
     ], proc_avatar: [
      {
        error: :content_type_invalid,
+       validator_type: :content_type,
        authorized_types: 'PNG',
        content_type: 'text/plain'
      }
@@ -266,7 +268,7 @@ class ActiveStorageValidations::Test < ActiveSupport::TestCase
     e.image.attach(html_file)
     e.proc_image.attach(html_file)
     assert !e.valid?
-    assert_equal e.errors.full_messages, ["Image is not a valid image", "Image has an invalid content type", "Proc image is not a valid image", "Proc image has an invalid content type"]
+    assert_equal e.errors.full_messages, ["Image is not a valid image", "Image is not a valid image", "Image has an invalid content type", "Proc image is not a valid image", "Proc image is not a valid image", "Proc image has an invalid content type"]
 
     e = OnlyImage.new
     e.image.attach(image_1920x1080_file)
diff --git a/test/dummy/app/models/attached.rb b/test/dummy/app/models/attached.rb
new file mode 100644
index 00000000..1fe5ac84
--- /dev/null
+++ b/test/dummy/app/models/attached.rb
@@ -0,0 +1,5 @@
+module Attached
+  def self.table_name_prefix
+    'attached_'
+  end
+end
diff --git a/test/dummy/app/models/attached/matcher.rb b/test/dummy/app/models/attached/matcher.rb
new file mode 100644
index 00000000..cf80c7da
--- /dev/null
+++ b/test/dummy/app/models/attached/matcher.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: attached_matchers
+#
+#  id         :integer          not null, primary key
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class Attached::Matcher < ApplicationRecord
+  has_one_attached :required
+  validates :required, attached: true
+
+  has_one_attached :required_with_message
+  validates :required_with_message, attached: { message: 'Mandatory.' }
+
+  has_one_attached :not_required
+end
diff --git a/test/dummy/app/models/content_type.rb b/test/dummy/app/models/content_type.rb
new file mode 100644
index 00000000..89d14b21
--- /dev/null
+++ b/test/dummy/app/models/content_type.rb
@@ -0,0 +1,5 @@
+module ContentType
+  def self.table_name_prefix
+    'content_type_'
+  end
+end
diff --git a/test/dummy/app/models/content_type/matcher.rb b/test/dummy/app/models/content_type/matcher.rb
new file mode 100644
index 00000000..4a1eff4a
--- /dev/null
+++ b/test/dummy/app/models/content_type/matcher.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: content_type_matchers
+#
+#  id         :integer          not null, primary key
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class ContentType::Matcher < ApplicationRecord
+  has_one_attached :allowing_one
+  validates :allowing_one, content_type: :png
+  has_one_attached :allowing_several
+  validates :allowing_several, content_type: ['image/png', 'image/gif']
+  has_one_attached :allowing_several_through_regex
+  validates :allowing_several_through_regex, content_type: [/\Aimage\/.*\z/]
+
+  has_one_attached :with_message
+  validates :with_message, content_type: { in: ['image/png'], message: 'Not authorized file type.' }
+
+  # Combinations
+  has_one_attached :allowing_one_with_message
+  validates :allowing_one_with_message, content_type: { in: ['file/pdf'], message: 'Not authorized file type.' }
+end
diff --git a/test/dummy/app/models/dimension.rb b/test/dummy/app/models/dimension.rb
new file mode 100644
index 00000000..a1f2a046
--- /dev/null
+++ b/test/dummy/app/models/dimension.rb
@@ -0,0 +1,5 @@
+module Dimension
+  def self.table_name_prefix
+    'dimension_'
+  end
+end
diff --git a/test/dummy/app/models/dimension/matcher.rb b/test/dummy/app/models/dimension/matcher.rb
new file mode 100644
index 00000000..0b844ddd
--- /dev/null
+++ b/test/dummy/app/models/dimension/matcher.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: dimension_matchers
+#
+#  id         :integer          not null, primary key
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class Dimension::Matcher < ApplicationRecord
+  %i(width height).each do |dimension|
+    has_one_attached :"#{dimension}_exact"
+    has_one_attached :"#{dimension}_in"
+    has_one_attached :"#{dimension}_min"
+    has_one_attached :"#{dimension}_max"
+    validates :"#{dimension}_exact", dimension: { "#{dimension}": 150 }
+    validates :"#{dimension}_in", dimension: { "#{dimension}": { in: 800..1200 } }
+    validates :"#{dimension}_min", dimension: { "#{dimension}": { min: 800 } }
+    validates :"#{dimension}_max", dimension: { "#{dimension}": { max: 1200 } }
+
+    # Combinations
+    has_one_attached :"#{dimension}_exact_with_message"
+    has_one_attached :"#{dimension}_in_with_message"
+    has_one_attached :"#{dimension}_min_with_message"
+    has_one_attached :"#{dimension}_max_with_message"
+    validates :"#{dimension}_exact_with_message", dimension: { "#{dimension}": 150, message: 'Invalid dimensions.' }
+    validates :"#{dimension}_in_with_message", dimension: { "#{dimension}": { in: 800..1200 }, message: 'Invalid dimensions.' }
+    validates :"#{dimension}_min_with_message", dimension: { "#{dimension}": { min: 800 }, message: 'Invalid dimensions.' }
+    validates :"#{dimension}_max_with_message", dimension: { "#{dimension}": { max: 1200 }, message: 'Invalid dimensions.' }
+  end
+
+  %i(min max).each do |bound|
+    has_one_attached :"#{bound}"
+    validates :"#{bound}", dimension: { "#{bound}": 800..600 }
+
+    # Combinations
+    has_one_attached :"#{bound}_with_message"
+    validates :"#{bound}_with_message", dimension: { "#{bound}": 800..600, message: 'Invalid dimensions.' }
+  end
+
+  has_one_attached :with_message
+  has_one_attached :without_message
+  validates :with_message, dimension: { width: 150, height: 150, message: 'Invalid dimensions.' }
+  validates :without_message, dimension: { width: 150, height: 150 }
+
+  # Combinations
+  has_one_attached :width_and_height_exact
+  has_one_attached :width_and_height_exact_with_message
+  validates :width_and_height_exact, dimension: { width: 150, height: 150 }
+  validates :width_and_height_exact_with_message, dimension: { width: 150, height: 150, message: 'Invalid dimensions.' }
+
+  has_one_attached :width_and_height_in
+  has_one_attached :width_and_height_in_with_message
+  validates :width_and_height_in, dimension: { width: { in: 800..1200 }, height: { in: 600..900 } }
+  validates :width_and_height_in_with_message, dimension: { width: { in: 800..1200 }, height: { in: 600..900 }, message: 'Invalid dimensions.' }
+
+  has_one_attached :width_and_height_min_max
+  has_one_attached :width_and_height_min_max_with_message
+  validates :width_and_height_min_max, dimension: { width: { min: 800, max: 1200 }, height: { min: 600, max: 900 } }
+  validates :width_and_height_min_max_with_message, dimension: { width: { min: 800, max: 1200 }, height: { min: 600, max: 900 }, message: 'Invalid dimensions.' }
+end
diff --git a/test/dummy/app/models/integration.rb b/test/dummy/app/models/integration.rb
new file mode 100644
index 00000000..02c47a73
--- /dev/null
+++ b/test/dummy/app/models/integration.rb
@@ -0,0 +1,5 @@
+module Integration
+  def self.table_name_prefix
+    'integration_'
+  end
+end
diff --git a/test/dummy/app/models/integration/matcher.rb b/test/dummy/app/models/integration/matcher.rb
new file mode 100644
index 00000000..df97960d
--- /dev/null
+++ b/test/dummy/app/models/integration/matcher.rb
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: dimension_matchers
+#
+#  id         :integer          not null, primary key
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class Integration::Matcher < ApplicationRecord
+  has_one_attached :example_1
+  validates :example_1, size: { less_than: 10.megabytes, message: 'must be less than 10 MB' },
+                        content_type: ['image/png', 'image/jpg', 'image/jpeg']
+end
diff --git a/test/dummy/app/models/project.rb b/test/dummy/app/models/project.rb
index ff8e02f9..4f5d8891 100644
--- a/test/dummy/app/models/project.rb
+++ b/test/dummy/app/models/project.rb
@@ -33,7 +33,6 @@ class Project < ApplicationRecord
   validates :documents, limit: { min: 1, max: 3 }
 
   validates :dimension_exact,               dimension: { width: 150, height: 150 }
-  validates :dimension_exact_with_message,  dimension: { width: 150, height: 150, message: 'Invalid dimensions.' }
   validates :dimension_range,               dimension: { width: { in: 800..1200 }, height: { in: 600..900 } }
   validates :dimension_min,                 dimension: { min: 800..600 }
   validates :dimension_max,                 dimension: { max: 1200..900 }
@@ -42,7 +41,6 @@ class Project < ApplicationRecord
   validates :proc_documents, limit: { min: -> (record) {1}, max: -> (record) {3} }
 
   validates :proc_dimension_exact,               dimension: { width: -> (record) {150}, height: -> (record) {150} }
-  validates :proc_dimension_exact_with_message,  dimension: { width: -> (record) {150}, height: -> (record) {150}, message: 'Invalid dimensions.' }
   validates :proc_dimension_range,               dimension: { width: { in: -> (record) {800..1200} }, height: { in: -> (record) {600..900} } }
   validates :proc_dimension_min,                 dimension: { min: -> (record) {800..600} }
   validates :proc_dimension_max,                 dimension: { max: -> (record) {1200..900} }
diff --git a/test/dummy/app/models/size.rb b/test/dummy/app/models/size.rb
new file mode 100644
index 00000000..0f23a17d
--- /dev/null
+++ b/test/dummy/app/models/size.rb
@@ -0,0 +1,5 @@
+module Size
+  def self.table_name_prefix
+    'size_'
+  end
+end
diff --git a/test/dummy/app/models/size/matcher.rb b/test/dummy/app/models/size/matcher.rb
new file mode 100644
index 00000000..8f8e8b0a
--- /dev/null
+++ b/test/dummy/app/models/size/matcher.rb
@@ -0,0 +1,49 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: size_matchers
+#
+#  id         :integer          not null, primary key
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+
+class Size::Matcher < ApplicationRecord
+  has_one_attached :less_than
+  has_one_attached :less_than_or_equal_to
+  has_one_attached :greater_than
+  has_one_attached :greater_than_or_equal_to
+  has_one_attached :between
+  validates :less_than, size: { less_than: 2.kilobytes }
+  validates :less_than_or_equal_to, size: { less_than_or_equal_to: 2.kilobytes }
+  validates :greater_than, size: { greater_than: 7.kilobytes }
+  validates :greater_than_or_equal_to, size: { greater_than_or_equal_to: 7.kilobytes }
+  validates :between, size: { between: 2.kilobytes..7.kilobytes }
+
+  has_one_attached :proc_less_than
+  has_one_attached :proc_less_than_or_equal_to
+  has_one_attached :proc_greater_than
+  has_one_attached :proc_greater_than_or_equal_to
+  has_one_attached :proc_between
+  validates :proc_less_than, size: { less_than: -> (record) { 2.kilobytes } }
+  validates :proc_less_than_or_equal_to, size: { less_than_or_equal_to: -> (record) { 2.kilobytes } }
+  validates :proc_greater_than, size: { greater_than: -> (record) { 7.kilobytes } }
+  validates :proc_greater_than_or_equal_to, size: { greater_than_or_equal_to: -> (record) { 7.kilobytes } }
+  validates :proc_between, size: { between: -> { 2.kilobytes..7.kilobytes } }
+
+  has_one_attached :with_message
+  validates :with_message, size: { less_than_or_equal_to: 5.megabytes, message: 'File is too big.' }
+
+  # Combinations
+  has_one_attached :less_than_with_message
+  has_one_attached :less_than_or_equal_to_with_message
+  has_one_attached :greater_than_with_message
+  has_one_attached :greater_than_or_equal_to_with_message
+  has_one_attached :between_with_message
+  validates :less_than_with_message, size: { less_than: 2.kilobytes, message: 'File is too big.' }
+  validates :less_than_or_equal_to_with_message, size: { less_than_or_equal_to: 2.kilobytes, message: 'File is too big.' }
+  validates :greater_than_with_message, size: { greater_than: 7.kilobytes, message: 'File is too small.' }
+  validates :greater_than_or_equal_to_with_message, size: { greater_than_or_equal_to: 7.kilobytes, message: 'File is too small.' }
+  validates :between_with_message, size: { between: 2.kilobytes..7.kilobytes, message: 'File is not in accepted size range.' }
+end
diff --git a/test/dummy/app/models/size/portfolio.rb b/test/dummy/app/models/size/portfolio.rb
index 3f26b8ea..e8bee33b 100644
--- a/test/dummy/app/models/size/portfolio.rb
+++ b/test/dummy/app/models/size/portfolio.rb
@@ -2,7 +2,7 @@
 
 # == Schema Information
 #
-# Table name: portfolios
+# Table name: size_portfolios
 #
 #  id         :integer          not null, primary key
 #  title      :string
diff --git a/test/dummy/app/models/size/several_validator.rb b/test/dummy/app/models/size/several_validator.rb
index 9c136ea3..2aa23552 100644
--- a/test/dummy/app/models/size/several_validator.rb
+++ b/test/dummy/app/models/size/several_validator.rb
@@ -2,7 +2,7 @@
 
 # == Schema Information
 #
-# Table name: several_validators
+# Table name: size_several_validators
 #
 #  id         :integer          not null, primary key
 #  title      :string
diff --git a/test/dummy/app/models/size/several_validator_proc.rb b/test/dummy/app/models/size/several_validator_proc.rb
index 6f5b270f..81eda4c7 100644
--- a/test/dummy/app/models/size/several_validator_proc.rb
+++ b/test/dummy/app/models/size/several_validator_proc.rb
@@ -2,7 +2,7 @@
 
 # == Schema Information
 #
-# Table name: several_validators
+# Table name: size_several_validator_procs
 #
 #  id         :integer          not null, primary key
 #  title      :string
diff --git a/test/dummy/app/models/size/zero_validator.rb b/test/dummy/app/models/size/zero_validator.rb
index 42f23705..3a64c56c 100644
--- a/test/dummy/app/models/size/zero_validator.rb
+++ b/test/dummy/app/models/size/zero_validator.rb
@@ -2,7 +2,7 @@
 
 # == Schema Information
 #
-# Table name: zero_validators
+# Table name: size_zero_validators
 #
 #  id         :integer          not null, primary key
 #  title      :string
diff --git a/test/dummy/app/models/size/zero_validator_proc.rb b/test/dummy/app/models/size/zero_validator_proc.rb
index 0f0f399b..29830376 100644
--- a/test/dummy/app/models/size/zero_validator_proc.rb
+++ b/test/dummy/app/models/size/zero_validator_proc.rb
@@ -2,7 +2,7 @@
 
 # == Schema Information
 #
-# Table name: zero_validator_procs
+# Table name: size_zero_validator_procs
 #
 #  id         :integer          not null, primary key
 #  title      :string
diff --git a/test/dummy/db/schema.rb b/test/dummy/db/schema.rb
index 6b2be953..bf1a8359 100644
--- a/test/dummy/db/schema.rb
+++ b/test/dummy/db/schema.rb
@@ -34,11 +34,31 @@
     end
   end
 
+  create_table :attached_matchers, force: :cascade do |t|
+    t.datetime :created_at, null: false
+    t.datetime :updated_at, null: false
+  end
+
+  create_table :content_type_matchers, force: :cascade do |t|
+    t.datetime :created_at, null: false
+    t.datetime :updated_at, null: false
+  end
+
+  create_table :dimension_matchers, force: :cascade do |t|
+    t.datetime :created_at, null: false
+    t.datetime :updated_at, null: false
+  end
+
   create_table :documents, force: :cascade do |t|
     t.datetime :created_at, precision: 6, null: false
     t.datetime :updated_at, precision: 6, null: false
   end
 
+  create_table :integration_matchers, force: :cascade do |t|
+    t.datetime :created_at, null: false
+    t.datetime :updated_at, null: false
+  end
+
   create_table :limit_attachments, force: :cascade do |t|
     t.string :name
   end
@@ -54,40 +74,45 @@
     t.datetime :updated_at, null: false
   end
 
-  create_table :portfolios, force: :cascade do |t|
-    t.string :title
+  create_table :ratio_models, force: :cascade do |t|
+    t.string :name
+    t.datetime :created_at, precision: 6, null: false
+    t.datetime :updated_at, precision: 6, null: false
+  end
+
+  create_table :size_matchers, force: :cascade do |t|
     t.datetime :created_at, null: false
     t.datetime :updated_at, null: false
   end
 
-  create_table :zero_validators, force: :cascade do |t|
+  create_table :size_portfolios, force: :cascade do |t|
     t.string :title
     t.datetime :created_at, null: false
     t.datetime :updated_at, null: false
   end
 
-  create_table :zero_validator_procs, force: :cascade do |t|
+  create_table :size_several_validator_procs, force: :cascade do |t|
     t.string :title
     t.datetime :created_at, null: false
     t.datetime :updated_at, null: false
   end
 
-  create_table :several_validators, force: :cascade do |t|
+  create_table :size_several_validators, force: :cascade do |t|
     t.string :title
     t.datetime :created_at, null: false
     t.datetime :updated_at, null: false
   end
 
-  create_table :several_validator_procs, force: :cascade do |t|
+  create_table :size_zero_validator_procs, force: :cascade do |t|
     t.string :title
     t.datetime :created_at, null: false
     t.datetime :updated_at, null: false
   end
 
-  create_table :ratio_models, force: :cascade do |t|
-    t.string :name
-    t.datetime :created_at, precision: 6, null: false
-    t.datetime :updated_at, precision: 6, null: false
+  create_table :size_zero_validators, force: :cascade do |t|
+    t.string :title
+    t.datetime :created_at, null: false
+    t.datetime :updated_at, null: false
   end
 
   create_table :users, force: :cascade do |t|
diff --git a/test/matchers/attached_validator_matcher_test.rb b/test/matchers/attached_validator_matcher_test.rb
index 689838cf..d63f8784 100644
--- a/test/matchers/attached_validator_matcher_test.rb
+++ b/test/matchers/attached_validator_matcher_test.rb
@@ -1,70 +1,71 @@
 # frozen_string_literal: true
 
 require 'test_helper'
+require 'matchers/support/matcher_helpers'
 require 'active_storage_validations/matchers'
 
-class ActiveStorageValidations::Matchers::AttachedValidatorMatcher::Test < ActiveSupport::TestCase
-  test 'positive match when providing class' do
-    matcher = ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(:avatar)
-    matcher.with_message("must not be blank")
-    assert matcher.matches?(User)
-  end
+describe ActiveStorageValidations::Matchers::AttachedValidatorMatcher do
+  include MatcherHelpers
 
-  test 'negative match when providing class' do
-    matcher = ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(:image_regex)
-    refute matcher.matches?(User)
-  end
+  let(:matcher) { ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(model_attribute) }
+  let(:klass) { Attached::Matcher }
 
-  test 'unknown attached when providing class' do
-    matcher = ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(:non_existing)
-    refute matcher.matches?(User)
-  end
+  describe '#with_message' do
+    let(:model_attribute) { :required_with_message }
 
-  test 'positive match when providing instance' do
-    matcher = ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(:avatar)
-    matcher.with_message("must not be blank")
-    assert matcher.matches?(User.new)
-  end
+    describe 'when provided with the model validation message' do
+      subject { matcher.with_message('Mandatory.') }
 
-  test 'negative match when providing instance' do
-    matcher = ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(:image_regex)
-    refute matcher.matches?(User.new)
-  end
+      it { is_expected_to_match_for(klass) }
+    end
 
-  test 'unknown attached when providing instance' do
-    matcher = ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(:non_existing)
-    refute matcher.matches?(User.new)
-  end
+    describe 'when provided with a different message than the model validation message' do
+      subject { matcher.with_message('<wrong message>') }
 
-  test 'positive match with valid conditional validation' do
-    matcher = ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(:conditional_image)
-    assert matcher.matches?(User.new(name: 'Foo'))
-  end
+      it { is_expected_not_to_match_for(klass) }
+    end
 
-  test 'negative match with invalid conditional validation' do
-    matcher = ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(:conditional_image)
-    refute matcher.matches?(User.new)
+    describe 'when not provided with the #with_message matcher method' do
+      subject { matcher }
+
+      it { is_expected_to_match_for(klass) }
+    end
   end
 
-  test 'positive match when providing instance with attachment' do
-    matcher = ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(:avatar)
-    matcher.with_message("must not be blank")
-    user = User.new
-    user.avatar.attach(io: Tempfile.new('.'), filename: 'image.png', content_type: 'image/png')
-    user.proc_avatar.attach(io: Tempfile.new('.'), filename: 'image.png', content_type: 'image/png')
-    assert matcher.matches?(user)
+  describe 'when the passed model attribute' do
+    describe 'does not exist' do
+      subject { matcher }
+
+      let(:model_attribute) { :not_present_in_model }
+
+      it { is_expected_not_to_match_for(klass) }
+    end
+
+    describe 'does not have an `attached: true` constraint' do
+      subject { matcher }
+
+      let(:model_attribute) { :not_required }
+
+      it { is_expected_not_to_match_for(klass) }
+    end
+
+    describe 'has a custom validation error message' do
+      describe 'but the matcher is not provided with a #with_message' do
+        subject { matcher }
+
+        let(:model_attribute) { :required_with_message }
+
+        it { is_expected_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'positive match when providing persisted instance with attachment' do
-    matcher = ActiveStorageValidations::Matchers::AttachedValidatorMatcher.new(:avatar)
-    matcher.with_message("must not be blank")
-    user = User.create!(
-      name: 'Pietje',
-      avatar: { io: Tempfile.new('.'), filename: 'image.png', content_type: 'image/png' },
-      photos: [{ io: Tempfile.new('.'), filename: 'image.png', content_type: 'image/png' }],
-      proc_avatar: { io: Tempfile.new('.'), filename: 'image.png', content_type: 'image/png' },
-      proc_photos: [{ io: Tempfile.new('.'), filename: 'image.png', content_type: 'image/png' }]
-    )
-    assert matcher.matches?(user)
+  describe 'when the matcher is provided with an instance' do
+    subject { matcher }
+
+    let(:model_attribute) { :required }
+    let(:instance) { klass.new }
+
+    it { is_expected_to_match_for(instance) }
   end
 end
diff --git a/test/matchers/content_type_validator_matcher_test.rb b/test/matchers/content_type_validator_matcher_test.rb
index ff45431a..89673ba6 100644
--- a/test/matchers/content_type_validator_matcher_test.rb
+++ b/test/matchers/content_type_validator_matcher_test.rb
@@ -1,98 +1,273 @@
 # frozen_string_literal: true
 
 require 'test_helper'
+require 'matchers/support/matcher_helpers'
 require 'active_storage_validations/matchers'
 
-class ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher::Test < ActiveSupport::TestCase
-  test 'positive match on both allowing and rejecting' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:avatar)
-    matcher.allowing('image/png')
-    matcher.rejecting('image/jpg')
+describe ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher do
+  include MatcherHelpers
 
-    assert matcher.matches?(User)
-  end
+  let(:matcher) { ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(model_attribute) }
+  let(:klass) { ContentType::Matcher }
 
-  test 'negative match on both allowing and rejecting' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:avatar)
-    matcher.rejecting('image/png')
-    matcher.allowing('image/jpg')
+  describe '#allowing' do
+    describe 'one' do
+      let(:model_attribute) { :allowing_one }
+      let(:allowed_type) { 'image/png' }
 
-    refute matcher.matches?(User)
-  end
+      describe 'when provided with the exact allowed type' do
+        subject { matcher.allowing(allowed_type) }
 
-  test 'positive match when providing class' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:avatar)
-    matcher.allowing('image/png')
-    assert matcher.matches?(User)
-  end
+        it { is_expected_to_match_for(klass) }
+      end
 
-  test 'negative match when providing class' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:avatar)
-    matcher.allowing('image/jpeg')
-    refute matcher.matches?(User)
-  end
+      describe 'when provided with something that is not a valid type' do
+        subject { matcher.allowing(not_valid_type) }
 
-  test 'unknown attached when providing class' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:non_existing)
-    matcher.allowing('image/png')
-    refute matcher.matches?(User)
-  end
+        let(:not_valid_type) { 'not_valid' }
 
-  test 'positive match when providing instance' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:avatar)
-    matcher.allowing('image/png')
-    assert matcher.matches?(User.new)
-  end
+        it { is_expected_not_to_match_for(klass) }
+      end
+    end
 
-  test 'negative match when providing instance' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:avatar)
-    matcher.allowing('image/jpeg')
-    refute matcher.matches?(User.new)
-  end
+    describe 'several' do
+      let(:model_attribute) { :allowing_several }
+      let(:allowed_types) { ['image/png', 'image/gif'] }
+      let(:not_allowed_types) { ['video/mkv', 'file/pdf'] }
 
-  test 'unknown attached when providing instance' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:non_existing)
-    matcher.allowing('image/png')
-    refute matcher.matches?(User.new)
-  end
+      describe 'when provided with the exact allowed types' do
+        subject { matcher.allowing(*allowed_types) }
+
+        it { is_expected_to_match_for(klass) }
+      end
+
+      describe 'when provided with only allowed types but not all types' do
+        subject { matcher.allowing(allowed_types.sample) }
+
+        it { is_expected_to_match_for(klass) }
+      end
+
+      describe 'when provided with allowed and not allowed types' do
+        subject { matcher.allowing(allowed_types.sample, not_allowed_types.sample) }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+
+      describe 'when provided with only not allowed types' do
+        subject { matcher.allowing(*not_allowed_types) }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+
+      describe 'when provided with something that is not a valid type' do
+        subject { matcher.allowing(not_valid_type) }
+
+        let(:not_valid_type) { 'not_valid' }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+    end
 
-  test 'positive match for rejecting' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:avatar)
-    matcher.rejecting('image/jpeg')
-    assert matcher.matches?(User)
+    describe 'several through regex' do
+      let(:model_attribute) { :allowing_several_through_regex }
+      let(:some_allowed_types) { ['image/png', 'image/gif'] }
+      let(:not_allowed_types) { ['video/mkv', 'file/pdf'] }
+
+      describe 'when provided with only allowed types but not all types' do
+        subject { matcher.allowing(*some_allowed_types) }
+
+        it { is_expected_to_match_for(klass) }
+      end
+
+      describe 'when provided with allowed and not allowed types' do
+        subject { matcher.allowing(some_allowed_types.sample, not_allowed_types.sample) }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+
+      describe 'when provided with only not allowed types' do
+        subject { matcher.allowing(*not_allowed_types) }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+
+      describe 'when provided with something that is not a valid type' do
+        subject { matcher.allowing(not_valid_type) }
+
+        let(:not_valid_type) { 'not_valid' }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'negative match for rejecting' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:avatar)
-    matcher.rejecting('image/png')
-    refute matcher.matches?(User)
+  describe '#rejecting' do
+    let(:model_attribute) { :allowing_one }
+    let(:allowed_type) { 'image/png' }
+
+    describe 'when provided with the exact allowed type' do
+      subject { matcher.rejecting(allowed_type) }
+
+      it { is_expected_not_to_match_for(klass) }
+    end
+
+    describe 'when provided with any type but the allowed type' do
+      subject { matcher.rejecting(any_type) }
+
+      let(:any_type) { 'video/mkv' }
+
+      it { is_expected_to_match_for(klass) }
+    end
+
+    describe 'when provided with any types but the allowed type' do
+      subject { matcher.rejecting(*any_types) }
+
+      let(:any_types) { ['video/mkv', 'image/gif'] }
+
+      it { is_expected_to_match_for(klass) }
+    end
+
+    describe 'when provided with any types and the allowed type' do
+      subject { matcher.rejecting(*types) }
+
+      let(:any_types) { ['video/mkv', 'image/gif'] }
+      let(:types) { any_types + [allowed_type] }
+
+      it { is_expected_not_to_match_for(klass) }
+    end
+
+    describe 'when provided with something that is not a valid type' do
+      subject { matcher.rejecting(not_valid_type) }
+
+      let(:not_valid_type) { 'not_valid' }
+
+      it { is_expected_to_match_for(klass) }
+    end
   end
 
-  test 'positive match on subset of accepted content types' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:photos)
-    matcher.allowing('image/png')
-    assert matcher.matches?(User)
+  describe '#with_message' do
+    let(:model_attribute) { :with_message }
+
+    describe 'when provided with the allowed content type' do
+      before { matcher.allowing('image/png') }
+
+      describe 'and with the message specified in the model validations' do
+        subject { matcher.with_message('Not authorized file type.') }
+
+        it { is_expected_to_match_for(klass) }
+      end
+
+      describe 'and with a different message than the one specified in the model validations' do
+        subject { matcher.with_message('<wrong message>') }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+
+      describe 'but without the #with_message matcher method' do
+        subject { matcher }
+
+        it { is_expected_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'matches when combined with a another validator which has errors (file size = 0)' do
-    matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:moon_picture)
-    matcher.allowing('image/png')
-    assert matcher.matches?(User)
+  describe 'Combinations' do
+    describe '#allowing + #with_message' do
+      let(:model_attribute) { :allowing_one_with_message }
+      let(:allowed_type) { 'file/pdf' }
+
+      describe 'when provided with the exact allowed type' do
+        describe 'and when provided with the message specified in the model validations' do
+          subject do
+            matcher.allowing(allowed_type)
+            matcher.with_message('Not authorized file type.')
+          end
+
+          it { is_expected_to_match_for(klass) }
+        end
+      end
+    end
+
+    describe '#rejecting + #with_message' do
+      let(:model_attribute) { :allowing_one_with_message }
+      let(:not_allowed_type) { 'video/mkv' }
+
+      describe 'when provided with a not allowed type' do
+        describe 'and when provided with the message specified in the model validations' do
+          subject do
+            matcher.rejecting(not_allowed_type)
+            matcher.with_message('Not authorized file type.')
+          end
+
+          it { is_expected_to_match_for(klass) }
+        end
+      end
+    end
+
+    describe '#allowing + #rejecting' do
+      let(:model_attribute) { :allowing_one }
+      let(:allowed_type) { 'image/png' }
+      let(:not_allowed_type) { 'video/mkv' }
+
+      describe 'when provided with the exact allowed type' do
+        describe 'and when provided with a not allowed type specified in the model validations' do
+          subject do
+            matcher.allowing(allowed_type)
+            matcher.rejecting(not_allowed_type)
+          end
+
+          it { is_expected_to_match_for(klass) }
+        end
+      end
+    end
+
+    describe '#allowing + #rejecting + #with_message' do
+      let(:model_attribute) { :allowing_one_with_message }
+      let(:allowed_type) { 'file/pdf' }
+      let(:not_allowed_type) { 'video/mkv' }
+
+      describe 'when provided with the exact allowed type' do
+        describe 'and when provided with a not allowed type' do
+          describe 'and when provided with the message specified in the model validations' do
+            subject do
+              matcher.allowing(allowed_type)
+              matcher.rejecting(not_allowed_type)
+              matcher.with_message('Not authorized file type.')
+            end
+
+            it { is_expected_to_match_for(klass) }
+          end
+        end
+      end
+    end
   end
 
-  class WithMessageMatcher < ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher::Test
-    test 'matches when provided with the model validation message' do
-      matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:photo_with_messages)
-      matcher.allowing('image/png')
-      matcher.with_message('must be an authorized type')
-      assert matcher.matches?(User)
+  describe 'when the passed model attribute' do
+    describe 'does not exist' do
+      subject { matcher }
+
+      let(:model_attribute) { :not_present_in_model }
+
+      it { is_expected_not_to_match_for(klass) }
     end
 
-    test 'does not match when not provided with the model validation message2' do
-      matcher = ActiveStorageValidations::Matchers::ContentTypeValidatorMatcher.new(:photo_with_messages)
-      matcher.allowing('image/png')
-      matcher.with_message('<wrong message>')
-      refute matcher.matches?(User)
+    describe 'has a custom validation error message' do
+      describe 'but the matcher is not provided with a #with_message' do
+        subject { matcher }
+
+        let(:model_attribute) { :with_message }
+
+        it { is_expected_to_match_for(klass) }
+      end
     end
   end
+
+  describe 'when the matcher is provided with an instance' do
+    subject { matcher.with_message('Not authorized file type.') }
+
+    let(:model_attribute) { :with_message }
+    let(:instance) { klass.new }
+
+    it { is_expected_to_match_for(instance) }
+  end
 end
diff --git a/test/matchers/dimension_validator_matcher_test.rb b/test/matchers/dimension_validator_matcher_test.rb
index f1fb7a7e..87ba7ef2 100644
--- a/test/matchers/dimension_validator_matcher_test.rb
+++ b/test/matchers/dimension_validator_matcher_test.rb
@@ -1,204 +1,595 @@
 # frozen_string_literal: true
 
 require 'test_helper'
+require 'matchers/support/matcher_helpers'
 require 'active_storage_validations/matchers'
 
-class ActiveStorageValidations::Matchers::DimensionValidatorMatcher::Test < ActiveSupport::TestCase
-  test 'width positive match on lower' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.width_min 800
-    assert matcher.matches?(Project)
-  end
+module DimensionValidatorMatcherTest
+  module DoesNotMatchWithAnyValues
+    extend ActiveSupport::Concern
 
-  test 'width less than lower' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.width_min 700
-    refute matcher.matches?(Project)
+    included do
+      include DimensionValidatorMatcherTest::DoesNotMatchWhenLowerValueThanLowerRangeBoundValue
+      include DimensionValidatorMatcherTest::DoesNotMatchWhenValueEqualToLowerRangeBoundValue
+      include DimensionValidatorMatcherTest::DoesNotMatchWhenValueEqualToHigherRangeBoundValue
+      include DimensionValidatorMatcherTest::DoesNotMatchWhenHigherValueThanHigherRangeBoundValue
+    end
   end
 
-  test 'width higher than lower' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.width_min 900
-    refute matcher.matches?(Project)
-  end
+  module DoesNotMatchWhenLowerValueThanLowerRangeBoundValue
+    extend ActiveSupport::Concern
 
-  test 'width positive match on higher' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.width_max 1200
-    assert matcher.matches?(Project)
-  end
+    included do
+      let(:lower_than_lower_range_bound_value) { matcher_method.match?(/_between/) ? 150..200 : 150 }
 
-  test 'width less than higher' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.width_max 1100
-    refute matcher.matches?(Project)
-  end
+      describe 'when provided with a lower width than the lower range bound width specified in the model validations' do
+        subject { matcher.public_send(matcher_method, lower_than_lower_range_bound_value) }
 
-  test 'width higher than higher' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.width_max 1300
-    refute matcher.matches?(Project)
+        it { is_expected_not_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'width positive exact match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_exact)
-    matcher.width 150
-    matcher.height 150 # Make sure the validation on height is ok
-    assert matcher.matches?(Project)
-  end
+  module DoesNotMatchWhenValueEqualToLowerRangeBoundValue
+    extend ActiveSupport::Concern
 
-  test 'width positive exact match with custom message' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_exact_with_message)
-    matcher.width 150
-    matcher.height 150
-    matcher.with_message('Invalid dimensions.')
-    assert matcher.matches?(Project)
-  end
+    included do
+      let(:lower_range_bound_value) { matcher_method.match?(/_between/) ? 800..1000 : 800 }
 
-  test 'width bigger than exact match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_exact)
-    matcher.width 999
-    matcher.height 150 # Make sure the validation on height is ok
-    refute matcher.matches?(Project)
-  end
+      describe 'when provided with the exact lower range bound width specified in the model validations' do
+        subject { matcher.public_send(matcher_method, lower_range_bound_value) }
 
-  test 'width smaller than exact match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_exact)
-    matcher.width 50
-    matcher.height 150 # Make sure the validation on height is ok
-    refute matcher.matches?(Project)
+        it { is_expected_not_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'height positive match on lower' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.height_min 600
-    assert matcher.matches?(Project)
-  end
+  module DoesNotMatchWhenValueEqualToHigherRangeBoundValue
+    extend ActiveSupport::Concern
 
-  test 'height less than lower' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.height_min 500
-    refute matcher.matches?(Project)
-  end
+    included do
+      let(:higher_range_bound_value) { matcher_method.match?(/_between/) ? 1200..1500 : 1200 }
 
-  test 'height higher than lower' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.height_min 700
-    refute matcher.matches?(Project)
-  end
+      describe 'when provided with the exact higher range bound width specified in the model validations' do
+        subject { matcher.public_send(matcher_method, higher_range_bound_value) }
 
-  test 'height positive match on higher' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.height_max 900
-    assert matcher.matches?(Project)
+        it { is_expected_not_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'height less than higher' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.height_max 800
-    refute matcher.matches?(Project)
-  end
+  module DoesNotMatchWhenHigherValueThanHigherRangeBoundValue
+    extend ActiveSupport::Concern
 
-  test 'height higher than higher' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.height_max 1000
-    refute matcher.matches?(Project)
-  end
+    included do
+      let(:higher_than_higher_range_bound_value) { matcher_method.match?(/_between/) ? 9999..10000 : 9999 }
 
-  test 'height positive exact match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_exact)
-    matcher.width 150 # Make sure the validation on width is ok
-    matcher.height 150
-    assert matcher.matches?(Project)
-  end
+      describe 'when provided with a higher width than the higher range bound width specified in the model validations' do
+        subject { matcher.public_send(matcher_method, higher_than_higher_range_bound_value) }
 
-  test 'height bigger than exact match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_exact)
-    matcher.width 150 # Make sure the validation on width is ok
-    matcher.height 999
-    refute matcher.matches?(Project)
+        it { is_expected_not_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'smaller smaller than exact match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_exact)
-    matcher.width 150 # Make sure the validation on width is ok
-    matcher.height 50
-    refute matcher.matches?(Project)
-  end
+  module OnlyMatchWhenExactValue
+    extend ActiveSupport::Concern
 
-  test 'works when providing an instance' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_range)
-    matcher.width_min 800
-    assert matcher.matches?(Project.new)
-  end
+    included do
+      describe 'when provided with a lower width than the width specified in the model validations' do
+        subject { matcher.public_send(matcher_method, 1) }
 
-  test 'unknown attached when providing class' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:non_existing)
-    matcher.width_min 800
-    refute matcher.matches?(Project)
-  end
+        it { is_expected_not_to_match_for(klass) }
+      end
 
-  test 'unknown attached when providing instance' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:non_existing)
-    matcher.width_min 800
-    refute matcher.matches?(Project.new)
-  end
+      describe 'when provided with the exact width specified in the model validations' do
+        subject { matcher.public_send(matcher_method, validator_value) }
 
-  # width_min and height_min combined
-  test 'both width_min and height_min on higher combined are a positive match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_min)
-    matcher.width_min 800
-    matcher.height_min 600
-    assert matcher.matches?(Project)
-  end
+        it { is_expected_to_match_for(klass) }
+      end
+
+      describe 'when provided with a higher width than the width specified in the model validations' do
+        subject { matcher.public_send(matcher_method, 9999) }
 
-  test 'width_min less than lower and height_min on higher combined are a negative match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_min)
-    matcher.width_min 700
-    matcher.height_min 600
-    refute matcher.matches?(Project)
+        it { is_expected_not_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'width_min on higher and height_min less than lower combined are a negative match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_min)
-    matcher.width_min 800
-    matcher.height_min 500
-    refute matcher.matches?(Project)
+  module OnlyMatchWhenExactValues
+    extend ActiveSupport::Concern
+
+    included do
+      %i(width height).each do |dimension|
+        describe "when provided with a lower #{dimension} than the #{dimension} specified in the model validations" do
+          subject do
+            matcher.width(dimension == :width ? 1 : 150)
+            matcher.height(dimension == :height ? 1 : 150)
+          end
+
+          it { is_expected_not_to_match_for(klass) }
+        end
+      end
+
+      describe 'when provided with the exact width and height specified in the model validations' do
+        subject do
+          matcher.width(150)
+          matcher.height(150)
+        end
+
+        it { is_expected_to_match_for(klass) }
+      end
+
+      %i(width height).each do |dimension|
+        describe "when provided with a higher #{dimension} than the #{dimension} specified in the model validations" do
+          subject do
+            matcher.width(dimension == :width ? 9999 : 150)
+            matcher.height(dimension == :height ? 9999 : 150)
+          end
+
+          it { is_expected_not_to_match_for(klass) }
+        end
+      end
+    end
   end
+end
+
+describe ActiveStorageValidations::Matchers::DimensionValidatorMatcher do
+  include MatcherHelpers
+
+  let(:matcher) { ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(model_attribute) }
+  let(:klass) { Dimension::Matcher }
+
+  %i(width height).each do |dimension|
+    describe "##{dimension}" do
+      let(:matcher_method) { dimension }
+
+      describe "when used on a #{dimension} exact validator (e.g. dimension: { #{dimension}: 150 })" do
+        let(:model_attribute) { :"#{dimension}_exact" }
+        let(:validator_value) { 150 }
+
+        include DimensionValidatorMatcherTest::OnlyMatchWhenExactValue
+      end
+
+      describe "when used on a #{dimension} in validator (e.g. dimension: { #{dimension}: { in: 800..1200 } })" do
+        let(:model_attribute) { :"#{dimension}_in" }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWithAnyValues
+      end
+
+      describe "when used on a #{dimension} min validator (e.g. dimension: { #{dimension}: { min: 800 } })" do
+        let(:model_attribute) { :"#{dimension}_min" }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWithAnyValues
+      end
+
+      describe "when used on a #{dimension} max validator (e.g. dimension: { #{dimension}: { max: 1200 } })" do
+        let(:model_attribute) { :"#{dimension}_max" }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWithAnyValues
+      end
+    end
+
+    describe "##{dimension}_between" do
+      let(:matcher_method) { :"#{dimension}_between" }
+
+      describe "when used on a #{dimension} exact validator (e.g. dimension: { #{dimension}: 150 })" do
+        let(:model_attribute) { :width_exact }
+        let(:validator_value) { 150 }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWithAnyValues
+      end
+
+      describe "when used on a #{dimension} in validator (e.g. dimension: { #{dimension}: { in: 800..1200 } })" do
+        let(:model_attribute) { :"#{dimension}_in" }
+
+        describe "when provided with the exact lower #{dimension} specified in the model validations" do
+          describe "and the exact higher #{dimension} specified in the model validations" do
+            subject { matcher.public_send(:"#{dimension}_between", 800..1200) }
+
+            it { is_expected_to_match_for(klass) }
+          end
+
+          describe "and a lower #{dimension} than the higher #{dimension} specified in the model validations" do
+            subject { matcher.public_send(:"#{dimension}_between", 800..1000) }
+
+            it { is_expected_not_to_match_for(klass) }
+          end
+
+          describe "and a higher #{dimension} than the higher #{dimension} specified in the model validations" do
+            subject { matcher.public_send(:"#{dimension}_between", 800..9999) }
+
+            it { is_expected_not_to_match_for(klass) }
+          end
+        end
+
+        describe "when provided with the exact higher #{dimension} specified in the model validations" do
+          describe "and the exact lowder #{dimension} specified in the model validations" do
+            subject { matcher.public_send(:"#{dimension}_between", 800..1200) }
+
+            it { is_expected_to_match_for(klass) }
+          end
+
+          describe "and a lower #{dimension} than the lower #{dimension} specified in the model validations" do
+            subject { matcher.public_send(:"#{dimension}_between", 1..1200) }
+
+            it { is_expected_not_to_match_for(klass) }
+          end
+
+          describe "and a higher #{dimension} than the lower #{dimension} specified in the model validations" do
+            subject { matcher.public_send(:"#{dimension}_between", 1000..1200) }
+
+            it { is_expected_not_to_match_for(klass) }
+          end
+        end
+      end
+
+      describe "when used on a #{dimension} min validator (e.g. dimension: { #{dimension}: { min: 1200 } })" do
+        let(:model_attribute) { :"#{dimension}_min" }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWithAnyValues
+      end
+
+      describe "when used on a #{dimension} max validator (e.g. dimension: { #{dimension}: { max: 1200 } })" do
+        let(:model_attribute) { :"#{dimension}_max" }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWithAnyValues
+      end
+    end
+
+    describe "##{dimension}_min" do
+      let(:matcher_method) { :"#{dimension}_min" }
+
+      describe "when used on a #{dimension} exact validator (e.g. dimension: { #{dimension}: 150 })" do
+        let(:model_attribute) { :"#{dimension}_exact" }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWithAnyValues
+      end
+
+      describe "when used on a #{dimension} in validator (e.g. dimension: { #{dimension}: { in: 800..1200 } })" do
+        let(:model_attribute) { :"#{dimension}_in" }
+        let(:validator_lower_range_bound_value) { 800 }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWhenLowerValueThanLowerRangeBoundValue
+
+        describe "when provided with the exact lower range bound #{dimension} specified in the model validations" do
+          subject { matcher.public_send(matcher_method, validator_lower_range_bound_value) }
+
+          it { is_expected_to_match_for(klass) }
+        end
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWhenValueEqualToHigherRangeBoundValue
+        include DimensionValidatorMatcherTest::DoesNotMatchWhenHigherValueThanHigherRangeBoundValue
+      end
+
+      describe "when used on a #{dimension} min validator (e.g. dimension: { #{dimension}: { min: 800 } })" do
+        let(:model_attribute) { :"#{dimension}_min" }
+        let(:validator_value) { 800 }
+
+        include DimensionValidatorMatcherTest::OnlyMatchWhenExactValue
+      end
 
-  test 'both width_min and height_min less than lower combined are a negative match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_min)
-    matcher.width_min 700
-    matcher.height_min 500
-    refute matcher.matches?(Project)
+      describe "when used on a #{dimension} max validator (e.g. dimension: { #{dimension}: { max: 1200 } })" do
+        let(:model_attribute) { :"#{dimension}_max" }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWithAnyValues
+      end
+    end
+
+    describe "##{dimension}_max" do
+      let(:matcher_method) { :"#{dimension}_max" }
+
+      describe "when used on a #{dimension} exact validator (e.g. dimension: { #{dimension}: 150 })" do
+        let(:model_attribute) { :"#{dimension}_exact" }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWithAnyValues
+      end
+
+      describe "when used on a #{dimension} in validator (e.g. dimension: { #{dimension}: { in: 800..1200 } })" do
+        let(:model_attribute) { :"#{dimension}_in" }
+        let(:validator_higher_range_bound_value) { 1200 }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWhenLowerValueThanLowerRangeBoundValue
+        include DimensionValidatorMatcherTest::DoesNotMatchWhenValueEqualToLowerRangeBoundValue
+
+        describe "when provided with the exact higher range bound #{dimension} specified in the model validations" do
+          subject { matcher.public_send(matcher_method, validator_higher_range_bound_value) }
+
+          it { is_expected_to_match_for(klass) }
+        end
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWhenHigherValueThanHigherRangeBoundValue
+      end
+
+      describe "when used on a #{dimension} min validator (e.g. dimension: { #{dimension}: { min: 800 } })" do
+        let(:model_attribute) { :"#{dimension}_min" }
+
+        include DimensionValidatorMatcherTest::DoesNotMatchWithAnyValues
+      end
+
+      describe "when used on a #{dimension} max validator (e.g. dimension: { #{dimension}: { max: 1200 } })" do
+        let(:model_attribute) { :"#{dimension}_max" }
+        let(:validator_value) { 1200 }
+
+        include DimensionValidatorMatcherTest::OnlyMatchWhenExactValue
+      end
+    end
   end
 
-  # width_max and height_max combined
-  test 'both width_max and height_max on higher combined are a positive match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_max)
-    matcher.width_max 1200
-    matcher.height_max 900
-    assert matcher.matches?(Project)
+  describe '#with_message' do
+    let(:model_attribute) { :with_message }
+
+    describe 'when provided with the exact dimension value(s) specified in the model validations' do
+      describe 'and with the message specified in the model validations' do
+        subject do
+          matcher.width(150)
+          matcher.height(150)
+          matcher.with_message('Invalid dimensions.')
+        end
+
+        it { is_expected_to_match_for(klass) }
+      end
+
+      describe 'and with a message not matching the message specified in the model validations' do
+        subject do
+          matcher.width(150)
+          matcher.height(150)
+          matcher.with_message('Invalid message.')
+        end
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+
+      describe 'but without the #with_message matcher method' do
+        subject do
+          matcher.width(150)
+          matcher.height(150)
+        end
+
+        it { is_expected_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'width_max higher than higher and height_max on higher combined are a negative match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_max)
-    matcher.width_max 1500
-    matcher.height_max 900
-    refute matcher.matches?(Project)
+  describe "Combinations" do
+    %i(width height).each do |dimension|
+      describe "##{dimension} + #with_message" do
+        let(:dimension_matcher_method) { dimension }
+        let(:model_attribute) { :"#{dimension}_exact_with_message" }
+
+        describe "when used on a #{dimension} exact with message validator (e.g. dimension: { #{dimension}: 150, message: 'Invalid dimensions.' })" do
+          describe "and when provided with the exact #{dimension} and message specified in the model validations" do
+            subject do
+              matcher.public_send(dimension_matcher_method, 150)
+              matcher.with_message('Invalid dimensions.')
+            end
+
+            it { is_expected_to_match_for(klass) }
+          end
+        end
+      end
+
+      describe "##{dimension}_between + #with_message" do
+        let(:dimension_matcher_method) { :"#{dimension}_between" }
+        let(:model_attribute) { :"#{dimension}_in_with_message" }
+
+        describe "when used on a #{dimension} in with message validator (e.g. dimension: { #{dimension}: { in: 800..1200 }, message: 'Invalid dimensions.' })" do
+          describe "and when provided with the exact #{dimension} range and message specified in the model validations" do
+            subject do
+              matcher.public_send(dimension_matcher_method, 800..1200)
+              matcher.with_message('Invalid dimensions.')
+            end
+
+            it { is_expected_to_match_for(klass) }
+          end
+        end
+      end
+
+      describe "##{dimension}_min + #with_message" do
+        let(:dimension_matcher_method) { :"#{dimension}_min" }
+        let(:model_attribute) { :"#{dimension}_min_with_message" }
+
+        describe "when used on a #{dimension} min with message validator (e.g. dimension: { #{dimension}: { min: 800 }, message: 'Invalid dimensions.' })" do
+          describe "and when provided with the min #{dimension} and message specified in the model validations" do
+            subject do
+              matcher.public_send(dimension_matcher_method, 800)
+              matcher.with_message('Invalid dimensions.')
+            end
+
+            it { is_expected_to_match_for(klass) }
+          end
+        end
+      end
+
+      describe "##{dimension}_max + #with_message" do
+        let(:dimension_matcher_method) { :"#{dimension}_max" }
+        let(:model_attribute) { :"#{dimension}_max_with_message" }
+
+        describe "when used on a #{dimension} max with message validator (e.g. dimension: { #{dimension}: { max: 1200 }, message: 'Invalid dimensions.' })" do
+          describe "and when provided with the max #{dimension} and message specified in the model validations" do
+            subject do
+              matcher.public_send(dimension_matcher_method, 1200)
+              matcher.with_message('Invalid dimensions.')
+            end
+
+            it { is_expected_to_match_for(klass) }
+          end
+        end
+      end
+    end
+
+    %i(min max).each do |bound|
+      describe "#width_#{bound} + #height_#{bound}" do
+        let(:model_attribute) { :"#{bound}" }
+
+        describe "when provided with both lower width and height than the width and height specified in the model validations" do
+          subject do
+            matcher.public_send(:"width_#{bound}", 1)
+            matcher.public_send(:"height_#{bound}", 1)
+          end
+
+          it { is_expected_not_to_match_for(klass) }
+        end
+
+        %i(width height).each do |dimension|
+          describe "when provided with a lower #{dimension} than the #{dimension} specified in the model validations" do
+            subject do
+              matcher.public_send(:"width_#{bound}", dimension == :width ? 1 : 800)
+              matcher.public_send(:"height_#{bound}", dimension == :height ? 1 : 600)
+            end
+
+            it { is_expected_not_to_match_for(klass) }
+          end
+        end
+
+        describe "when provided with the exact width and height specified in the model validations" do
+          subject do
+            matcher.public_send(:"width_#{bound}", 800)
+            matcher.public_send(:"height_#{bound}", 600)
+          end
+
+          it { is_expected_to_match_for(klass) }
+        end
+
+        %i(width height).each do |dimension|
+          describe "when provided with a higher #{dimension} than the #{dimension} specified in the model validations" do
+            subject do
+              matcher.public_send(:"width_#{bound}", dimension == :width ? 9999 : 800)
+              matcher.public_send(:"height_#{bound}", dimension == :height ? 9999 : 600)
+            end
+
+            it { is_expected_not_to_match_for(klass) }
+          end
+        end
+
+        describe "when provided with both higher width and height than the width and height specified in the model validations" do
+          subject do
+            matcher.public_send(:"width_#{bound}", 9999)
+            matcher.public_send(:"height_#{bound}", 9999)
+          end
+
+          it { is_expected_not_to_match_for(klass) }
+        end
+      end
+
+      describe "#width_#{bound} + #height_#{bound} + #with_message" do
+        let(:model_attribute) { :"#{bound}_with_message" }
+
+        describe "when provided with the exact width and height specified in the model validations" do
+          describe "and when provided with the message specified in the model validations" do
+            subject do
+              matcher.public_send(:"width_#{bound}", 800)
+              matcher.public_send(:"height_#{bound}", 600)
+              matcher.with_message('Invalid dimensions.')
+            end
+
+            it { is_expected_to_match_for(klass) }
+          end
+        end
+      end
+    end
+
+    describe '#width + #height' do
+      describe 'when used on a width exact and height exact validator (e.g. dimension: { width: 150, height: 150 })' do
+        let(:model_attribute) { :width_and_height_exact }
+
+        include DimensionValidatorMatcherTest::OnlyMatchWhenExactValues
+      end
+    end
+
+    describe '#width + #height + #with_message' do
+      let(:model_attribute) { :width_and_height_exact_with_message }
+
+      describe "when used on a width exact and height exact with message validator (e.g. dimension: { width: 150, height: 150, message: 'Invalid dimensions.' })" do
+        describe 'and when provided with the exact width, height and message specified in the model validations' do
+          subject do
+            matcher.width(150)
+            matcher.height(150)
+            matcher.with_message('Invalid dimensions.')
+          end
+
+          it { is_expected_to_match_for(klass) }
+        end
+      end
+    end
+
+    describe "#width_between + #height_between" do
+      let(:model_attribute) { :width_and_height_in }
+
+      describe "when provided with the width and height ranges specified in the model validations" do
+        subject do
+          matcher.width_between(800..1200)
+          matcher.height_between(600..900)
+        end
+
+        it { is_expected_to_match_for(klass) }
+
+        describe "when used on a width and height min max validator (e.g. dimension: { width: { min: 800, max: 1200 }, height: { min: 600, max: 900 } })" do
+          let(:model_attribute) { :width_and_height_min_max }
+
+          it { is_expected_to_match_for(klass) }
+        end
+      end
+    end
+
+    describe "#width_between + #height_between + #with_message" do
+      let(:model_attribute) { :width_and_height_in_with_message }
+
+      describe "when provided with the exact width and height ranges specified in the model validations" do
+        describe "and when provided with the message specified in the model validations" do
+          subject do
+            matcher.width_between(800..1200)
+            matcher.height_between(600..900)
+            matcher.with_message('Invalid dimensions.')
+          end
+
+          it { is_expected_to_match_for(klass) }
+        end
+      end
+    end
+
+    describe "#width_min + #width_max + #height_min + #height_max" do
+      let(:model_attribute) { :width_and_height_min_max }
+
+      describe "when provided with the width and height min max specified in the model validations" do
+        subject do
+          matcher.width_min(800)
+          matcher.width_max(1200)
+          matcher.height_min(600)
+          matcher.height_max(900)
+        end
+
+        it { is_expected_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'width_max on higher and height_max higher than higher combined are a negative match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_max)
-    matcher.width_max 1200
-    matcher.height_max 1100
-    refute matcher.matches?(Project)
+  describe 'when the passed model attribute' do
+    describe 'does not exist' do
+      subject { matcher.width(150) }
+
+      let(:model_attribute) { :not_present_in_model }
+
+      it { is_expected_not_to_match_for(klass) }
+    end
+
+    describe 'has a custom validation error message' do
+      describe 'but the matcher is not provided with a #with_message' do
+        subject { matcher.width(150) }
+
+        let(:model_attribute) { :width_exact_with_message }
+
+        it { is_expected_to_match_for(klass) }
+      end
+    end
   end
 
-  test 'both width_max and height_max higher than higher combined are a negative match' do
-    matcher = ActiveStorageValidations::Matchers::DimensionValidatorMatcher.new(:dimension_max)
-    matcher.width_min 1500
-    matcher.height_max 1100
-    refute matcher.matches?(Project)
+  describe 'when the matcher is provided with an instance' do
+    subject { matcher.width(150) }
+
+    let(:model_attribute) { :width_exact }
+    let(:instance) { klass.new }
+
+    it { is_expected_to_match_for(instance) }
   end
 end
diff --git a/test/matchers/integration/integration_test.rb b/test/matchers/integration/integration_test.rb
new file mode 100644
index 00000000..113b8f69
--- /dev/null
+++ b/test/matchers/integration/integration_test.rb
@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require 'test_helper'
+require 'matchers/support/matcher_helpers'
+require 'active_storage_validations/matchers'
+
+describe 'Integration tests' do
+  include MatcherHelpers
+
+  let(:klass) { Integration::Matcher }
+  let(:matcher_class) { "ActiveStorageValidations::Matchers::#{matcher_type.to_s.camelize}ValidatorMatcher".constantize }
+  let(:matcher) { matcher_class.new(model_attribute) }
+
+  describe 'example_1' do
+    # validates :example_1, size: { less_than: 10.megabytes, message: 'must be less than 10 MB' },
+    #                       content_type: ['image/png', 'image/jpg', 'image/jpeg']
+    let(:model_attribute) { :example_1 }
+
+    describe 'size matcher' do
+      let(:matcher_type) { :size }
+
+      describe 'when provided with the size value and size message specified in the model validations' do
+        subject do
+          matcher.less_than(10.megabytes)
+          matcher.with_message('must be less than 10 MB')
+        end
+
+        it { is_expected_to_match_for(klass) }
+      end
+    end
+
+    describe 'content_type matcher' do
+      let(:matcher_type) { :content_type }
+
+      describe 'when provided with the content_type value specified in the model validations' do
+        subject do
+          matcher.allowing('image/png', 'image/jpg', 'image/jpeg')
+        end
+
+        it { is_expected_to_match_for(klass) }
+      end
+    end
+  end
+end
diff --git a/test/matchers/size_validator_matcher_test.rb b/test/matchers/size_validator_matcher_test.rb
index 1a3b6f80..c80d1317 100644
--- a/test/matchers/size_validator_matcher_test.rb
+++ b/test/matchers/size_validator_matcher_test.rb
@@ -1,163 +1,268 @@
 # frozen_string_literal: true
 
 require 'test_helper'
+require 'matchers/support/matcher_helpers'
 require 'active_storage_validations/matchers'
 
-class ActiveStorageValidations::Matchers::SizeValidatorMatcher::Test < ActiveSupport::TestCase
+module SizeValidatorMatcherTest
+  module OnlyMatchWhenExactValue
+    extend ActiveSupport::Concern
 
-  class LessThanMatcher < ActiveStorageValidations::Matchers::SizeValidatorMatcher::Test
-    test 'matches when provided with the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_less_than)
-      matcher.less_than 2.kilobytes
-      assert matcher.matches?(Size::Portfolio)
-    end
+    included do
+      describe 'standard validator' do
+        describe 'when provided with a lower size than the size specified in the model validations' do
+          subject { matcher.public_send(matcher_method, 0.5.kilobyte) }
+  
+          it { is_expected_not_to_match_for(klass) }
+        end
+  
+        describe 'when provided with the exact size specified in the model validations' do
+          subject { matcher.public_send(matcher_method, validator_value) }
+  
+          it { is_expected_to_match_for(klass) }
+        end
+  
+        describe 'when provided with a higher size than the size specified in the model validations' do
+          subject { matcher.public_send(matcher_method, 99.kilobytes) }
+  
+          it { is_expected_not_to_match_for(klass) }
+        end
+      end
 
-    test 'does not match when provided a higher value than the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_less_than)
-      matcher.less_than 5.kilobytes
-      refute matcher.matches?(Size::Portfolio)
-    end
+      describe 'proc validator' do
+        let(:matcher) { ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:"proc_#{model_attribute}") }
+
+        describe 'when provided with a lower size than the size specified in the model validations' do
+          subject { matcher.public_send(matcher_method, 0.5.kilobyte) }
+
+          it { is_expected_not_to_match_for(klass) }
+        end
+
+        describe 'when provided with the exact size specified in the model validations' do
+          subject { matcher.public_send(matcher_method, validator_value) }
+
+          it { is_expected_to_match_for(klass) }
+        end
+
+        describe 'when provided with a higher size than the size specified in the model validations' do
+          subject { matcher.public_send(matcher_method, 99.kilobytes) }
 
-    test 'does not match when provided a lower value than the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_less_than)
-      matcher.less_than 0.5.kilobyte
-      refute matcher.matches?(Size::Portfolio)
+          it { is_expected_not_to_match_for(klass) }
+        end
+      end
     end
   end
+end
 
+describe ActiveStorageValidations::Matchers::SizeValidatorMatcher do
+  include MatcherHelpers
 
-  class LessThanOrEqualToMatcher < ActiveStorageValidations::Matchers::SizeValidatorMatcher::Test
-    test 'matches when provided with the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_less_than_or_equal_to)
-      matcher.less_than_or_equal_to 2.kilobytes
-      assert matcher.matches?(Size::Portfolio)
-    end
+  let(:matcher) { ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(model_attribute) }
+  let(:klass) { Size::Matcher }
 
-    test 'does not match when provided a higher value than the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_less_than_or_equal_to)
-      matcher.less_than_or_equal_to 5.kilobytes
-      refute matcher.matches?(Size::Portfolio)
-    end
+  describe '#less_than' do
+    let(:matcher_method) { :less_than }
+    let(:model_attribute) { matcher_method }
+    let(:validator_value) { 2.kilobytes }
 
-    test 'does not match when provided a lower value than the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_less_than_or_equal_to)
-      matcher.less_than_or_equal_to 0.5.kilobyte
-      refute matcher.matches?(Size::Portfolio)
-    end
+    include SizeValidatorMatcherTest::OnlyMatchWhenExactValue
   end
 
+  describe '#less_than_or_equal_to' do
+    let(:matcher_method) { :less_than_or_equal_to }
+    let(:model_attribute) { matcher_method }
+    let(:validator_value) { 2.kilobytes }
 
-  class GreaterThanMatcher < ActiveStorageValidations::Matchers::SizeValidatorMatcher::Test
-    test 'matches when provided with the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_greater_than)
-      matcher.greater_than 7.kilobytes
-      assert matcher.matches?(Size::Portfolio)
-    end
+    include SizeValidatorMatcherTest::OnlyMatchWhenExactValue
+  end
 
-    test 'does not match when provided a higher value than the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_greater_than)
-      matcher.greater_than 10.kilobytes
-      refute matcher.matches?(Size::Portfolio)
-    end
+  describe '#greater_than' do
+    let(:matcher_method) { :greater_than }
+    let(:model_attribute) { matcher_method }
+    let(:validator_value) { 7.kilobytes }
 
-    test 'does not match when provided a lower value than the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_greater_than)
-      matcher.greater_than 0.5.kilobyte
-      refute matcher.matches?(Size::Portfolio)
-    end
+    include SizeValidatorMatcherTest::OnlyMatchWhenExactValue
+  end
+
+  describe '#greater_than_or_equal_to' do
+    let(:matcher_method) { :greater_than_or_equal_to }
+    let(:model_attribute) { matcher_method }
+    let(:validator_value) { 7.kilobytes }
+
+    include SizeValidatorMatcherTest::OnlyMatchWhenExactValue
   end
 
+  describe '#between' do
+    let(:model_attribute) { :between }
+
+    describe 'when provided with the exact sizes specified in the model validations' do
+      subject { matcher.between 2.kilobytes..7.kilobytes }
 
-  class GreaterThanOrEqualToMatcher < ActiveStorageValidations::Matchers::SizeValidatorMatcher::Test
-    test 'matches when provided with the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_greater_than_or_equal_to)
-      matcher.greater_than_or_equal_to 7.kilobytes
-      assert matcher.matches?(Size::Portfolio)
+      it { is_expected_to_match_for(klass) }
     end
 
-    test 'does not match when provided a higher value than the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_greater_than_or_equal_to)
-      matcher.greater_than_or_equal_to 10.kilobytes
-      refute matcher.matches?(Size::Portfolio)
+    describe 'when provided with a higher size than the size specified in the model validations' do
+      describe 'for the highest possible size' do
+        subject { matcher.between 2.kilobytes..10.kilobytes }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+
+      describe 'for the lowest possible size' do
+        subject { matcher.between 5.kilobytes..7.kilobytes }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
     end
 
-    test 'does not match when provided a lower value than the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_greater_than_or_equal_to)
-      matcher.greater_than_or_equal_to 0.5.kilobyte
-      refute matcher.matches?(Size::Portfolio)
+    describe 'when provided with a lower size than the size specified in the model validations' do
+      describe 'for the highest possible size' do
+        subject { matcher.between 1.kilobytes..7.kilobytes }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+
+      describe 'for the lowest possible size' do
+        subject { matcher.between 1.kilobytes..7.kilobytes }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+    end
+
+    describe 'when provided with both lowest and highest possible sizes different than the model validations' do
+      subject { matcher.between 4.kilobytes..20.kilobytes }
+
+      it { is_expected_not_to_match_for(klass) }
     end
   end
 
+  describe '#with_message' do
+    let(:model_attribute) { :with_message }
+
+    describe 'when provided with the exact size' do
+      before { matcher.less_than_or_equal_to(5.megabytes) }
+
+      describe 'and with the message specified in the model validations' do
+        subject { matcher.with_message('File is too big.') }
+
+        it { is_expected_to_match_for(klass) }
+      end
 
-  class BetweenMatcher < ActiveStorageValidations::Matchers::SizeValidatorMatcher::Test
-    test 'matches when provided with the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_between)
-      matcher.between 2.kilobytes..7.kilobytes
-      assert matcher.matches?(Size::Portfolio)
+      describe 'when provided with a different message than the one specified in the model validations' do
+        subject { matcher.with_message('<wrong message>') }
+
+        it { is_expected_not_to_match_for(klass) }
+      end
+
+      describe 'but without the #with_message matcher method' do
+        subject { matcher }
+
+        it { is_expected_to_match_for(klass) }
+      end
     end
+  end
+
+  describe 'Combinations' do
+    describe '#less_than + #with_message' do
+      let(:model_attribute) { :less_than_with_message }
+
+      describe 'when provided with the exact size' do
+        describe 'and when provided with the message specified in the model validations' do
+          subject do
+            matcher.less_than 2.kilobytes
+            matcher.with_message('File is too big.')
+          end
 
-    test 'does not match when provided a higher value than the model validation value for highest possible size' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_between)
-      matcher.between 2.kilobytes..10.kilobytes
-      refute matcher.matches?(Size::Portfolio)
+          it { is_expected_to_match_for(klass) }
+        end
+      end
     end
 
-    test 'does not match when provided a lower value than the model validation value for highest possible size' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_between)
-      matcher.between 1.kilobytes..7.kilobytes
-      refute matcher.matches?(Size::Portfolio)
+    describe '#less_than_or_equal_to + #with_message' do
+      let(:model_attribute) { :less_than_or_equal_to_with_message }
+
+      describe 'when provided with the exact size' do
+        describe 'and when provided with the message specified in the model validations' do
+          subject do
+            matcher.less_than_or_equal_to 2.kilobytes
+            matcher.with_message('File is too big.')
+          end
+
+          it { is_expected_to_match_for(klass) }
+        end
+      end
     end
 
-    test 'does not match when provided a higher value than the model validation value for lowest possible size' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_between)
-      matcher.between 5.kilobytes..7.kilobytes
-      refute matcher.matches?(Size::Portfolio)
+    describe '#greater_than + #with_message' do
+      let(:model_attribute) { :greater_than_with_message }
+
+      describe 'when provided with the exact size' do
+        describe 'and when provided with the message specified in the model validations' do
+          subject do
+            matcher.greater_than 7.kilobytes
+            matcher.with_message('File is too small.')
+          end
+
+          it { is_expected_to_match_for(klass) }
+        end
+      end
     end
 
-    test 'does not match when provided a lower value than the model validation value for lowest possible size' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_between)
-      matcher.between 1.kilobytes..7.kilobytes
-      refute matcher.matches?(Size::Portfolio)
+    describe '#greater_than_or_equal_to + #with_message' do
+      let(:model_attribute) { :greater_than_or_equal_to_with_message }
+
+      describe 'when provided with the exact size' do
+        describe 'and when provided with the message specified in the model validations' do
+          subject do
+            matcher.greater_than_or_equal_to 7.kilobytes
+            matcher.with_message('File is too small.')
+          end
+
+          it { is_expected_to_match_for(klass) }
+        end
+      end
     end
 
-    test 'does not match when provided both lowest and highest possible values different than the model validation value' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_between)
-      matcher.between 4.kilobytes..20.kilobytes
-      refute matcher.matches?(Size::Portfolio)
+    describe '#between + #with_message' do
+      let(:model_attribute) { :between_with_message }
+
+      describe 'when provided with the exact size' do
+        describe 'and when provided with the message specified in the model validations' do
+          subject do
+            matcher.between 2.kilobyte..7.kilobytes
+            matcher.with_message('File is not in accepted size range.')
+          end
+
+          it { is_expected_to_match_for(klass) }
+        end
+      end
     end
   end
 
+  describe 'when the passed model attribute has a custom validation error message' do
+    describe 'but the matcher is not provided with a #with_message' do
+      subject { matcher.less_than_or_equal_to 5.megabytes }
 
-  class WithMessageMatcher < ActiveStorageValidations::Matchers::SizeValidatorMatcher::Test
-    test 'matches when provided with the model validation message' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_with_message)
-      matcher.between 2.kilobytes..7.kilobytes
-      matcher.with_message('is not in required file size range')
-      assert matcher.matches?(Size::Portfolio)
-    end
+      let(:model_attribute) { :with_message }
 
-    test 'does not match when not provided with the model validation' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_with_message)
-      matcher.between 2.kilobytes..7.kilobytes
-      matcher.with_message('<wrong message>')
-      refute matcher.matches?(Size::Portfolio)
+      it { is_expected_to_match_for(klass) }
     end
   end
 
+  describe 'when the passed model attribute does not exist' do
+    subject { matcher.less_than 2.kilobytes }
 
-  class UnknownAttachedAttribute < ActiveStorageValidations::Matchers::SizeValidatorMatcher::Test
-    test 'does not match when provided with an unknown attached attribute' do
-      matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:non_existing)
-      matcher.greater_than 2.kilobytes
-      refute matcher.matches?(Size::Portfolio)
-    end
+    let(:model_attribute) { :not_present_in_model }
+
+    it { is_expected_not_to_match_for(klass) }
   end
 
+  describe 'when the matcher is provided with an instance' do
+    subject { matcher.less_than 2.kilobytes }
+
+    let(:model_attribute) { :less_than }
+    let(:instance) { klass.new }
 
-  # Other tests
-  test 'matches when provided with an instance' do
-    matcher = ActiveStorageValidations::Matchers::SizeValidatorMatcher.new(:size_less_than)
-    matcher.less_than 2.kilobytes
-    assert matcher.matches?(Size::Portfolio.new)
+    it { is_expected_to_match_for(instance) }
   end
 end
diff --git a/test/matchers/support/matcher_helpers.rb b/test/matchers/support/matcher_helpers.rb
new file mode 100644
index 00000000..8fd2addb
--- /dev/null
+++ b/test/matchers/support/matcher_helpers.rb
@@ -0,0 +1,9 @@
+module MatcherHelpers
+  def is_expected_to_match_for(klass)
+    subject && assert(subject.matches?(klass))
+  end
+
+  def is_expected_not_to_match_for(klass)
+    subject && refute(subject.matches?(klass))
+  end
+end
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 232e315b..a8b70bcf 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -19,6 +19,8 @@
 # Load other test helpers
 require 'rails/test_help'
 require 'minitest/mock'
+require 'minitest/spec'
+require 'minitest/focus'
 
 # Filter out Minitest backtrace while allowing backtrace from other libraries
 # to be shown.