yii composer install

tests/codeception/functional/LoginCept.php

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+<?php
+
+use tests\codeception\_pages\LoginPage;
+
+/* @var $scenario Codeception\Scenario */
+
+$I = new FunctionalTester($scenario);
+$I->wantTo('ensure that login works');
+
+$loginPage = LoginPage::openBy($I);
+
+$I->see('Login', 'h1');
+
+$I->amGoingTo('try to login with empty credentials');
+$loginPage->login('', '');
+$I->expectTo('see validations errors');
+$I->see('Username cannot be blank.');
+$I->see('Password cannot be blank.');
+
+$I->amGoingTo('try to login with wrong credentials');
+$loginPage->login('admin', 'wrong');
+$I->expectTo('see validations errors');
+$I->see('Incorrect username or password.');
+
+$I->amGoingTo('try to login with correct credentials');
+$loginPage->login('admin', 'admin');
+$I->expectTo('see user info');
+$I->see('Logout (admin)');