first commit

frontend/tests/unit/models/ContactFormTest.php

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+<?php
+namespace frontend\tests\unit\models;
+
+use Yii;
+use frontend\models\ContactForm;
+
+class ContactFormTest extends \Codeception\Test\Unit
+{
+    public function testSendEmail()
+    {
+        $model = new ContactForm();
+
+        $model->attributes = [
+            'name' => 'Tester',
+            'email' => 'tester@example.com',
+            'subject' => 'very important letter subject',
+            'body' => 'body of current message',
+        ];
+
+        expect_that($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');
+    }
+}