add files to project

tests/unit/models/ContactFormTest.php

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+<?php
+
+namespace tests\models;
+
+use app\models\ContactForm;
+
+class ContactFormTest extends \Codeception\Test\Unit
+{
+    private $model;
+    /**
+     * @var \UnitTester
+     */
+    public $tester;
+
+    public function testEmailIsSentOnContact()
+    {
+        /** @var ContactForm $model */
+        $this->model = $this->getMockBuilder('app\models\ContactForm')
+            ->setMethods(['validate'])
+            ->getMock();
+
+        $this->model->expects($this->once())
+            ->method('validate')
+            ->will($this->returnValue(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();
+
+        $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');
+    }
+}