'#prefix'=>'<p>'.$this->t('Possible database updates were detected in the following extensions; you may be redirected to the database update page in order to complete the update process.').'</p>',
$this->assertStringContainsString('Possible database updates were detected in the following extensions; you may be redirected to the database update page in order to complete the update process.',$warning_messages->getText());
$this->assertStringContainsString('Possible database updates have been detected in the following extensions.',$warning_messages->getText());