Add truncate_tables method to SQLiteAdapter.

Without this, the PostgreSQLAdapter truncate_tables method would be
called and go kerblooie cuz t'ain't no PostgreSQL database in play.

.gitignore

@@ -8,4 +8,5 @@ vendor/
 examples/db/*.db
 examples/config/database.yml
 db/config.yml
+db/test.sqlite3
 .vagrant

db/sample.config.yml

@@ -24,3 +24,9 @@ postgres:
   host: 127.0.0.1
   encoding: unicode
   template: template0
+
+sqlite3:
+  adapter: sqlite3
+  database: db/test.sqlite3
+  pool: 5
+  timeout: 5000

lib/database_cleaner/active_record/truncation.rb

@@ -100,6 +100,10 @@ def delete_table(table_name)
       end
       alias truncate_table delete_table
 
+      def truncate_tables(tables)
+        tables.each { |t| truncate_table(t) }
+      end
+
       private
 
       # Returns a boolean indicating if the SQLite database is using the sqlite_sequence table.

spec/database_cleaner/active_record/truncation/sqlite3_spec.rb

@@ -0,0 +1,42 @@
+require 'spec_helper'
+require 'active_record'
+require 'support/active_record/sqlite3_setup'
+require 'database_cleaner/active_record/truncation'
+
+module ActiveRecord
+  module ConnectionAdapters
+    describe do
+      before(:all) { active_record_sqlite3_setup }
+
+      let(:adapter) { SQLite3Adapter }
+
+      let(:connection) do
+        active_record_sqlite3_connection
+      end
+
+      before(:each) do
+        connection.truncate_tables connection.tables
+      end
+
+      describe "#truncate_table" do
+        it "truncates the table" do
+          2.times { User.create }
+
+          connection.truncate_table('users')
+          User.count.should eq 0
+        end
+
+        it "resets AUTO_INCREMENT index of table" do
+          2.times { User.create }
+          User.delete_all
+
+          connection.truncate_table('users')
+
+          User.create.id.should eq 1
+        end
+      end
+
+    end
+  end
+end
+

spec/support/active_record/sqlite3_setup.rb

@@ -0,0 +1,40 @@
+require 'support/active_record/database_setup'
+require 'support/active_record/schema_setup'
+
+module SQLite3Helper
+  puts "Active Record #{ActiveRecord::VERSION::STRING}, sqlite3"
+
+  # ActiveRecord::Base.logger = Logger.new(STDERR)
+
+  def config
+    db_config['sqlite3']
+  end
+
+  def create_db
+    @encoding = config['encoding'] || ENV['CHARSET'] || 'utf8'
+    begin
+      establish_connection(config.merge('database' => 'sqlite3', 'schema_search_path' => 'public'))
+    rescue Exception => e
+      $stderr.puts e, *(e.backtrace)
+      $stderr.puts "Couldn't create database for #{config.inspect}"
+    end
+  end
+
+  def establish_connection config = config
+    ActiveRecord::Base.establish_connection(config)
+  end
+
+  def active_record_sqlite3_setup
+    create_db
+    establish_connection
+    load_schema
+  end
+
+  def active_record_sqlite3_connection
+    ActiveRecord::Base.connection
+  end
+end
+
+RSpec.configure do |c|
+  c.include SQLite3Helper
+end