changeDefaultLanguageToDutch example

$mailTemplateTypeId = $this->getMailTemplateTypeId();
        static::assertNotNull($mailTemplateTypeId);
        static::assertNotNull($this->getMailTemplateId($mailTemplateTypeId));
    }

    public function testNewMailTemplatesAreAddedWithoutGermanAndEnglishLanguage(): void
    {
        // Rollback migration data and make sure its gone         $this->rollbackMigrationChanges();
        static::assertNull($this->getMailTemplateTypeId());

        $this->changeDefaultLanguageToDutch();

        // Rerun migration and make sure everything is added again         $migration = new Migration1672931011ReviewFormMailTemplate();
        $migration->update($this->connection);

        $mailTemplateTypeId = $this->getMailTemplateTypeId();
        static::assertNotNull($mailTemplateTypeId);
        static::assertNotNull($this->getMailTemplateId($mailTemplateTypeId));
    }

    public function testMigrationWithExistingTemplateData(): void
    {