Fix namespaces in unit tests (yiisoft#171)

Author: ricpelo

tests/unit/models/ContactFormTest.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace tests\models;
+namespace tests\unit\models;
 
 class ContactFormTest extends \Codeception\Test\Unit
 {

tests/unit/models/LoginFormTest.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace tests\models;
+namespace tests\unit\models;
 
 use app\models\LoginForm;
 

tests/unit/models/UserTest.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace tests\models;
+namespace tests\unit\models;
 
 use app\models\User;