Refactor emails models objects, rework related tests

common/tests/unit/emails/templates/ChangeEmailTest.php

@@ -0,0 +1,36 @@
+<?php
+declare(strict_types=1);
+
+namespace common\tests\unit\emails\templates;
+
+use common\emails\templates\ChangeEmail;
+use common\tests\unit\TestCase;
+use yii\base\InvalidCallException;
+use yii\mail\MailerInterface;
+
+class ChangeEmailTest extends TestCase {
+
+    /**
+     * @var ChangeEmail()|\PHPUnit\Framework\MockObject\MockObject
+     */
+    private $template;
+
+    public function testParams() {
+        $this->template->setKey('mock-key');
+        $params = $this->template->getParams();
+        $this->assertSame('mock-key', $params['key']);
+    }
+
+    public function testInvalidCallOfParams() {
+        $this->expectException(InvalidCallException::class);
+        $this->template->getParams();
+    }
+
+    protected function _before() {
+        parent::_before();
+        /** @var MailerInterface|\PHPUnit\Framework\MockObject\MockObject $mailer */
+        $mailer = $this->createMock(MailerInterface::class);
+        $this->template = new ChangeEmail($mailer);
+    }
+
+}