model = $this->getMockBuilder('app\models\ContactForm') ->setMethods(['validate']) ->getMock(); $this->model->expects($this->once()) ->method('validate') ->willReturn(true); $this->model->attributes = [ 'name' => 'Tester', 'email' => 'tester@example.com', 'subject' => 'very important letter subject', 'body' => 'body of current message', ]; expect_that($this->model->contact('admin@example.com')); // using Yii2 module actions to check email was sent $this->tester->seeEmailIsSent(); /** @var MessageInterface $emailMessage */ $emailMessage = $this->tester->grabLastSentEmail(); expect('valid email is sent', $emailMessage)->isInstanceOf('yii\mail\MessageInterface'); expect($emailMessage->getTo())->hasKey('admin@example.com'); expect($emailMessage->getFrom())->hasKey('noreply@example.com'); expect($emailMessage->getReplyTo())->hasKey('tester@example.com'); expect($emailMessage->getSubject())->equals('very important letter subject'); expect($emailMessage->toString())->contains('body of current message'); } }