Merge pull request #21342 from yui-knk/test/add_assert_method

Add `assert_nothing_raised` to make clear test case perpose

activerecord/test/cases/migration_test.rb

@@ -115,7 +115,7 @@ def test_any_migrations
   end
 
   def test_migration_version
-    ActiveRecord::Migrator.run(:up, MIGRATIONS_ROOT + "/version_check", 20131219224947)
+    assert_nothing_raised { ActiveRecord::Migrator.run(:up, MIGRATIONS_ROOT + "/version_check", 20131219224947) }
   end
 
   def test_create_table_with_force_true_does_not_drop_nonexisting_table