Add a helper function to create new table

[MAILPOET-4835]

mailpoet/tests/integration/API/JSON/v1/SetupTest.php

@@ -16,15 +16,6 @@ use MailPoet\Settings\SettingsRepository;
 use MailPoet\Subscription\Captcha;
 use MailPoet\WP\Functions as WPFunctions;
 
-/**
- * The "created_at" column must be NULL in some tables to avoid "there can be only one
- * TIMESTAMP column with CURRENT_TIMESTAMP" error on MySQL version < 5.6.5 that occurs
- * even when other timestamp is simply "NOT NULL".
- *
- * Additionally, having multiple timestamp columns with "NOT NULL" seems to produce the
- * following error in some SQL modes:
- *   SQLSTATE[42000]: Syntax error or access violation: 1067 Invalid default value for 'updated_at'"
- */
 class SetupTest extends \MailPoetTest {
   public function _before() {
     parent::_before();