yii composer install

tests/codeception/_pages/AboutPage.php

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+<?php
+
+namespace tests\codeception\_pages;
+
+use yii\codeception\BasePage;
+
+/**
+ * Represents about page
+ * @property \AcceptanceTester|\FunctionalTester $actor
+ */
+class AboutPage extends BasePage
+{
+    public $route = 'site/about';
+}

tests/codeception/_pages/ContactPage.php

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+<?php
+
+namespace tests\codeception\_pages;
+
+use yii\codeception\BasePage;
+
+/**
+ * Represents contact page
+ * @property \AcceptanceTester|\FunctionalTester $actor
+ */
+class ContactPage extends BasePage
+{
+    public $route = 'site/contact';
+
+    /**
+     * @param array $contactData
+     */
+    public function submit(array $contactData)
+    {
+        foreach ($contactData as $field => $value) {
+            $inputType = $field === 'body' ? 'textarea' : 'input';
+            $this->actor->fillField($inputType . '[name="ContactForm[' . $field . ']"]', $value);
+        }
+        $this->actor->click('contact-button');
+    }
+}

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');
+    }
+}