moving logger test to its own file

activerecord/test/cases/migration/logger_test.rb

+require "cases/helper"
+
+module ActiveRecord
+  class Migration
+    class LoggerTest < ActiveRecord::TestCase
+      def test_migration_should_be_run_without_logger
+        previous_logger = ActiveRecord::Base.logger
+        ActiveRecord::Base.logger = nil
+        assert_nothing_raised do
+          ActiveRecord::Migrator.migrate(MIGRATIONS_ROOT + "/valid")
+        end
+      ensure
+        ActiveRecord::Base.logger = previous_logger
+      end
+    end
+  end
+end

activerecord/test/cases/migration_test.rb

@@ -1238,19 +1238,6 @@ def with_env_tz(new_tz = 'US/Eastern')
     ensure
       old_tz ? ENV['TZ'] = old_tz : ENV.delete('TZ')
     end
-
-end
-
-class MigrationLoggerTest < ActiveRecord::TestCase
-  def test_migration_should_be_run_without_logger
-    previous_logger = ActiveRecord::Base.logger
-    ActiveRecord::Base.logger = nil
-    assert_nothing_raised do
-      ActiveRecord::Migrator.migrate(MIGRATIONS_ROOT + "/valid")
-    end
-  ensure
-    ActiveRecord::Base.logger = previous_logger
-  end
 end
 
 class InterleavedMigrationsTest < ActiveRecord::TestCase