Инициализировано Yii2 приложение, выпилены лишние части, накинуты чуточку нужных

tests/codeception/api/functional/SignupCest.php

@@ -0,0 +1,90 @@
+<?php
+
+namespace tests\codeception\api\functional;
+
+use tests\codeception\api\_pages\SignupPage;
+use common\models\User;
+
+class SignupCest
+{
+
+    /**
+     * This method is called before each cest class test method
+     * @param \Codeception\Event\TestEvent $event
+     */
+    public function _before($event)
+    {
+    }
+
+    /**
+     * This method is called after each cest class test method, even if test failed.
+     * @param \Codeception\Event\TestEvent $event
+     */
+    public function _after($event)
+    {
+        User::deleteAll([
+            'email' => 'tester.email@example.com',
+            'username' => 'tester',
+        ]);
+    }
+
+    /**
+     * This method is called when test fails.
+     * @param \Codeception\Event\FailEvent $event
+     */
+    public function _fail($event)
+    {
+
+    }
+
+    /**
+     *
+     * @param \codeception_api\FunctionalTester $I
+     * @param \Codeception\Scenario $scenario
+     */
+    public function testUserSignup($I, $scenario)
+    {
+        $I->wantTo('ensure that signup works');
+
+        $signupPage = SignupPage::openBy($I);
+        $I->see('Signup', 'h1');
+        $I->see('Please fill out the following fields to signup:');
+
+        $I->amGoingTo('submit signup form with no data');
+
+        $signupPage->submit([]);
+
+        $I->expectTo('see validation errors');
+        $I->see('Username cannot be blank.', '.help-block');
+        $I->see('Email cannot be blank.', '.help-block');
+        $I->see('Password cannot be blank.', '.help-block');
+
+        $I->amGoingTo('submit signup form with not correct email');
+        $signupPage->submit([
+            'username' => 'tester',
+            'email' => 'tester.email',
+            'password' => 'tester_password',
+        ]);
+
+        $I->expectTo('see that email address is wrong');
+        $I->dontSee('Username cannot be blank.', '.help-block');
+        $I->dontSee('Password cannot be blank.', '.help-block');
+        $I->see('Email is not a valid email address.', '.help-block');
+
+        $I->amGoingTo('submit signup form with correct email');
+        $signupPage->submit([
+            'username' => 'tester',
+            'email' => 'tester.email@example.com',
+            'password' => 'tester_password',
+        ]);
+
+        $I->expectTo('see that user is created');
+        $I->seeRecord('common\models\User', [
+            'username' => 'tester',
+            'email' => 'tester.email@example.com',
+        ]);
+
+        $I->expectTo('see that user logged in');
+        $I->seeLink('Logout (tester)');
+    }
+}