attributes = [ 'name' => 'Tester', 'email' => 'tester@example.com', 'subject' => 'very important letter subject', 'body' => 'body of current message', ]; expect_that($model->sendEmail('admin@example.com')); // using Yii2 module actions to check email was sent $this->tester->seeEmailIsSent(); $emailMessage = $this->tester->grabLastSentEmail(); expect('valid email is sent', $emailMessage)->isInstanceOf('yii\mail\MessageInterface'); expect($emailMessage->getTo())->hasKey('admin@example.com'); expect($emailMessage->getFrom())->hasKey('tester@example.com'); expect($emailMessage->getSubject())->equals('very important letter subject'); expect($emailMessage->toString())->contains('body of current message'); } }