Добавлены тесты для новоявленного компонента

tests/codeception/common/unit/emails/EmailHelperTest.php

@@ -0,0 +1,18 @@
+<?php
+namespace tests\codeception\common\unit\emails;
+
+use common\emails\EmailHelper;
+use common\models\Account;
+use tests\codeception\common\unit\TestCase;
+
+class EmailHelperTest extends TestCase {
+
+    public function testBuildTo() {
+        /** @var Account|\Mockery\MockInterface $account */
+        $account = mock(Account::class)->makePartial();
+        $account->username = 'mock-username';
+        $account->email = 'mock@ely.by';
+        $this->assertEquals(['mock@ely.by' => 'mock-username'], EmailHelper::buildTo($account));
+    }
+
+}