yii composer install

tests/codeception/_pages/LoginPage.php

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+<?php
+
+namespace tests\codeception\_pages;
+
+use yii\codeception\BasePage;
+
+/**
+ * Represents login page
+ * @property \AcceptanceTester|\FunctionalTester $actor
+ */
+class LoginPage extends BasePage
+{
+    public $route = 'site/login';
+
+    /**
+     * @param string $username
+     * @param string $password
+     */
+    public function login($username, $password)
+    {
+        $this->actor->fillField('input[name="LoginForm[username]"]', $username);
+        $this->actor->fillField('input[name="LoginForm[password]"]', $password);
+        $this->actor->click('login-button');
+    }
+}