Merge branch 'develop-ascraeus' into develop

# By Nicofuma
# Via Nathaniel Guse (1) and Nicofuma (1)
* develop-ascraeus:
  [ticket/12432] Correcting the assertion
  [ticket/12432] Adding unit test
  [ticket/12432] Migrator should not revert custom functions

phpBB/phpbb/db/migrator.php

@@ -509,10 +509,17 @@ class migrator
 					throw new \phpbb\db\migration\exception('MIGRATION_INVALID_DATA_CUSTOM_NOT_CALLABLE', $step);
 				}
 
+				if ($reverse)
+				{
+					return false;
+				}
+				else
+				{
 					return array(
 						$parameters[0],
 						array($last_result),
 					);
+				}
 			break;
 
 			default:

tests/dbal/migration/revert.php

@@ -35,6 +35,14 @@ class phpbb_dbal_migration_revert extends \phpbb\db\migration\migration
 	{
 		return array(
 			array('config.add', array('foobartest', 0)),
+			array('custom', array(array(&$this, 'my_custom_function'))),
 		);
 	}
+
+	function my_custom_function()
+	{
+		global $migrator_test_revert_counter;
+
+		$migrator_test_revert_counter += 1;
+	}
 }

tests/dbal/migrator_test.php

@@ -174,10 +174,14 @@ class phpbb_dbal_migrator_test extends phpbb_database_test_case
 
 	public function test_revert()
 	{
+		global $migrator_test_revert_counter;
+
 		// Make sure there are no other migrations in the db, this could cause issues
 		$this->db->sql_query("DELETE FROM phpbb_migrations");
 		$this->migrator->load_migration_state();
 
+		$migrator_test_revert_counter = 0;
+
 		$this->migrator->set_migrations(array('phpbb_dbal_migration_revert', 'phpbb_dbal_migration_revert_with_dependency'));
 
 		$this->assertFalse($this->migrator->migration_state('phpbb_dbal_migration_revert'));
@@ -219,6 +223,8 @@ class phpbb_dbal_migrator_test extends phpbb_database_test_case
 		{
 			$this->fail('Revert did not remove test_column.');
 		}
+
+		$this->assertEquals(1, $migrator_test_revert_counter, 'Revert did call custom function again');
 	}
 
 	public function test_fail()