Class#name returns a frozen string on ruby 2.7 (#83)

* Class#name returns a frozen string on ruby 2.7

* Run specs with ruby 2.7.2

.circleci/config.yml

@@ -6,7 +6,7 @@ version: 2
 jobs:
  build:
  docker:
- - image: circleci/ruby:2.4.4
+ - image: circleci/ruby:2.7.2
  environment:
  CC_TEST_REPORTER_ID: 03ab83a772148a577d29d4acf438d7ebdc95c632224122d0ba8dbb291eedebe6
  COVERAGE: true

Gemfile.lock

@@ -55,4 +55,4 @@ DEPENDENCIES
  upperkut!
 
 BUNDLED WITH
- 1.17.2
+ 2.1.4

lib/upperkut/util.rb

@@ -4,7 +4,7 @@
 module Upperkut
  module Util
  def to_underscore(object)
- klass_name = object
+ klass_name = object.dup
  klass_name.gsub!(/::/, '_')
  klass_name.gsub!(/([A-Z\d]+)([A-Z][a-z])/, '\1_\2')
  klass_name.gsub!(/([a-z\d])([A-Z])/, '\1_\2')

spec/upperkut/util_spec.rb

@@ -4,6 +4,16 @@ module Upperkut
  RSpec.describe Util do
  include Upperkut::Util
 
+ describe '#to_underscore' do
+ it 'transforms strings into their underscored version' do
+ expect(to_underscore("Upperkut::BufferedQueue")).to eq('upperkut_buffered_queue')
+ end
+
+ it 'transforms frozen strings into their underscored version properly' do
+ expect(to_underscore(Upperkut::Util.name)).to eq('upperkut_util')
+ end
+ end
+
  describe '#normalize_items' do
  it 'transforms hashes into items' do
  items_hash = [{ 'my_property' => 1 }]