mailer->fileTransportCallback = function ($mailer, $message) { return 'testing_message.eml'; }; } protected function tearDown() { unlink($this->getMessageFile()); parent::tearDown(); } public function testContact() { $model = new ContactForm(); $model->attributes = [ 'name' => 'Tester', 'email' => 'tester@example.com', 'subject' => 'very important letter subject', 'body' => 'body of current message', ]; $model->sendEmail('admin@example.com'); $this->specify('email should be send', function () { expect('email file should exist', file_exists($this->getMessageFile()))->true(); }); $this->specify('message should contain correct data', function () use ($model) { $emailMessage = file_get_contents($this->getMessageFile()); expect('email should contain user name', $emailMessage)->contains($model->name); expect('email should contain sender email', $emailMessage)->contains($model->email); expect('email should contain subject', $emailMessage)->contains($model->subject); expect('email should contain body', $emailMessage)->contains($model->body); }); } private function getMessageFile() { return Yii::getAlias(Yii::$app->mailer->fileTransportPath) . '/testing_message.eml'; } }