Remove some indirection in rake dbs test

Just pass in the expected database as argument rather than "caching"
it in a hash and using the hash in the helper methods.

railties/test/application/rake/dbs_test.rb

@@ -26,56 +26,48 @@ def set_database_url
         FileUtils.rm_rf("#{app_path}/config/database.yml")
       end
 
-      def expected
-        @expected ||= {}
-      end
-
-      def db_create_and_drop
+      def db_create_and_drop(expected_database)
         Dir.chdir(app_path) do
           output = `bundle exec rake db:create`
           assert_empty output
-          assert File.exist?(expected[:database])
-          assert_equal expected[:database], ActiveRecord::Base.connection_config[:database]
+          assert File.exist?(expected_database)
+          assert_equal expected_database, ActiveRecord::Base.connection_config[:database]
           output = `bundle exec rake db:drop`
           assert_empty output
-          assert !File.exist?(expected[:database])
+          assert !File.exist?(expected_database)
         end
       end
 
       test 'db:create and db:drop without database url' do
         require "#{app_path}/config/environment"
-        expected[:database] = ActiveRecord::Base.configurations[Rails.env]['database']
-        db_create_and_drop
+        db_create_and_drop ActiveRecord::Base.configurations[Rails.env]['database']
       end
 
       test 'db:create and db:drop with database url' do
         require "#{app_path}/config/environment"
         set_database_url
-        expected[:database] = database_url_db_name
-        db_create_and_drop
+        db_create_and_drop database_url_db_name
       end
 
-      def db_migrate_and_status
+      def db_migrate_and_status(expected_database)
         Dir.chdir(app_path) do
           `rails generate model book title:string;
            bundle exec rake db:migrate`
           output = `bundle exec rake db:migrate:status`
-          assert_match(%r{database:\s+\S*#{Regexp.escape(expected[:database])}}, output)
+          assert_match(%r{database:\s+\S*#{Regexp.escape(expected_database)}}, output)
           assert_match(/up\s+\d{14}\s+Create books/, output)
         end
       end
 
       test 'db:migrate and db:migrate:status without database_url' do
         require "#{app_path}/config/environment"
-        expected[:database] = ActiveRecord::Base.configurations[Rails.env]['database']
-        db_migrate_and_status
+        db_migrate_and_status ActiveRecord::Base.configurations[Rails.env]['database']
       end
 
       test 'db:migrate and db:migrate:status with database_url' do
         require "#{app_path}/config/environment"
         set_database_url
-        expected[:database] = database_url_db_name
-        db_migrate_and_status
+        db_migrate_and_status database_url_db_name
       end
 
       def db_schema_dump
@@ -96,12 +88,11 @@ def db_schema_dump
         db_schema_dump
       end
 
-      def db_fixtures_load
+      def db_fixtures_load(expected_database)
         Dir.chdir(app_path) do
           `rails generate model book title:string;
            bundle exec rake db:migrate db:fixtures:load`
-          assert_match(/#{expected[:database]}/,
-                    ActiveRecord::Base.connection_config[:database])
+          assert_match expected_database, ActiveRecord::Base.connection_config[:database]
           require "#{app_path}/app/models/book"
           assert_equal 2, Book.count
         end
@@ -109,26 +100,23 @@ def db_fixtures_load
 
       test 'db:fixtures:load without database_url' do
         require "#{app_path}/config/environment"
-        expected[:database] =  ActiveRecord::Base.configurations[Rails.env]['database']
-        db_fixtures_load
+        db_fixtures_load ActiveRecord::Base.configurations[Rails.env]['database']
       end
 
       test 'db:fixtures:load with database_url' do
         require "#{app_path}/config/environment"
         set_database_url
-        expected[:database] = database_url_db_name
-        db_fixtures_load
+        db_fixtures_load database_url_db_name
       end
 
-      def db_structure_dump_and_load
+      def db_structure_dump_and_load(expected_database)
         Dir.chdir(app_path) do
           `rails generate model book title:string;
            bundle exec rake db:migrate db:structure:dump`
           structure_dump = File.read("db/structure.sql")
           assert_match(/CREATE TABLE \"books\"/, structure_dump)
           `bundle exec rake environment db:drop db:structure:load`
-          assert_match(/#{expected[:database]}/,
-                        ActiveRecord::Base.connection_config[:database])
+          assert_match expected_database, ActiveRecord::Base.connection_config[:database]
           require "#{app_path}/app/models/book"
           #if structure is not loaded correctly, exception would be raised
           assert_equal 0, Book.count
@@ -137,15 +125,13 @@ def db_structure_dump_and_load
 
       test 'db:structure:dump and db:structure:load without database_url' do
         require "#{app_path}/config/environment"
-        expected[:database] =  ActiveRecord::Base.configurations[Rails.env]['database']
-        db_structure_dump_and_load
+        db_structure_dump_and_load ActiveRecord::Base.configurations[Rails.env]['database']
       end
 
       test 'db:structure:dump and db:structure:load with database_url' do
         require "#{app_path}/config/environment"
         set_database_url
-        expected[:database] = database_url_db_name
-        db_structure_dump_and_load
+        db_structure_dump_and_load database_url_db_name
       end
 
       def db_test_load_structure
@@ -157,8 +143,8 @@ def db_test_load_structure
           require "#{app_path}/app/models/book"
           #if structure is not loaded correctly, exception would be raised
           assert_equal 0, Book.count
-          assert_match(/#{ActiveRecord::Base.configurations['test']['database']}/,
-                        ActiveRecord::Base.connection_config[:database])
+          assert_match ActiveRecord::Base.configurations['test']['database'],
+            ActiveRecord::Base.connection_config[:database]
         end
       end