init

tests/unit/models/LoginFormTest.php

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+<?php
+
+namespace tests\models;
+
+use app\models\LoginForm;
+
+class LoginFormTest extends \Codeception\Test\Unit
+{
+    private $model;
+
+    protected function _after()
+    {
+        \Yii::$app->user->logout();
+    }
+
+    public function testLoginNoUser()
+    {
+        $this->model = new LoginForm([
+            'username' => 'not_existing_username',
+            'password' => 'not_existing_password',
+        ]);
+
+        expect_not($this->model->login());
+        expect_that(\Yii::$app->user->isGuest);
+    }
+
+    public function testLoginWrongPassword()
+    {
+        $this->model = new LoginForm([
+            'username' => 'demo',
+            'password' => 'wrong_password',
+        ]);
+
+        expect_not($this->model->login());
+        expect_that(\Yii::$app->user->isGuest);
+        expect($this->model->errors)->hasKey('password');
+    }
+
+    public function testLoginCorrect()
+    {
+        $this->model = new LoginForm([
+            'username' => 'demo',
+            'password' => 'demo',
+        ]);
+
+        expect_that($this->model->login());
+        expect_not(\Yii::$app->user->isGuest);
+        expect($this->model->errors)->hasntKey('password');
+    }
+
+}