diff --git a/tests/_bootstrap.php b/tests/_bootstrap.php
index b3d9bbc..e2dcb10 100644
--- a/tests/_bootstrap.php
+++ b/tests/_bootstrap.php
@@ -1 +1,3 @@
 <?php
+
+require_once(__DIR__.'/yii_bootstrap.php');
diff --git a/tests/_helpers/TestCase.php b/tests/_helpers/TestCase.php
new file mode 100644
index 0000000..e92aa51
--- /dev/null
+++ b/tests/_helpers/TestCase.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace tests\_helpers;
+
+class TestCase extends \PHPUnit_Framework_TestCase
+{
+
+	/**
+	 * Your application config, will be merged with base config when creating application.
+	 * @var array
+	 */
+	protected $config = array();
+
+	/**
+	 * Created application class
+	 * @var string
+	 */
+	protected $appClass = '\yii\web\Application';
+
+	protected function setUp()
+	{
+		parent::setUp();
+		$this->mockApplication();
+	}
+
+	protected function tearDown()
+	{
+		$this->destroyApplication();
+		parent::tearDown();
+	}
+
+	protected function mockApplication()
+	{
+		$baseConfig = require(__DIR__.'/../unit/_bootstrap.php');
+		$config = \yii\helpers\ArrayHelper::merge($baseConfig,$this->config);
+		new $this->appClass($config);
+	}
+
+	protected function destroyApplication()
+	{
+		\Yii::$app = null;
+	}
+
+	/**
+	 * Use this method when you need to dump variables with var_dump function.
+	 * This is caused by the buffering output of the codeception.
+	 * @param mixed $var
+	 */
+	protected static function varDump($var)
+	{
+		ob_start();
+		var_dump($var);
+		\Codeception\Util\Debug::debug(ob_get_clean());
+	}
+
+}
diff --git a/tests/unit/_bootstrap.php b/tests/unit/_bootstrap.php
index 14d14fd..b677bc1 100644
--- a/tests/unit/_bootstrap.php
+++ b/tests/unit/_bootstrap.php
@@ -2,9 +2,7 @@
 
 $config = require(__DIR__.'/../yii_bootstrap.php');
 
-$config = yii\helpers\ArrayHelper::merge(
+return yii\helpers\ArrayHelper::merge(
 	$config,
 	require(__DIR__ . '/../../config/codeception/unit.php')
 );
-
-$application = new yii\web\Application($config);
diff --git a/tests/unit/models/ContactFormTest.php b/tests/unit/models/ContactFormTest.php
index 689f124..66377c7 100644
--- a/tests/unit/models/ContactFormTest.php
+++ b/tests/unit/models/ContactFormTest.php
@@ -2,15 +2,7 @@
 
 namespace tests\unit\models;
 
-class ContactFormTest extends \PHPUnit_Framework_TestCase
+class ContactFormTest extends \tests\_helpers\TestCase
 {
 
-	protected function setUp()
-	{
-	}
-
-	protected function tearDown()
-	{
-	}
-
 }
diff --git a/tests/unit/models/LoginFormTest.php b/tests/unit/models/LoginFormTest.php
index 98d5351..1f06fa5 100644
--- a/tests/unit/models/LoginFormTest.php
+++ b/tests/unit/models/LoginFormTest.php
@@ -2,15 +2,7 @@
 
 namespace tests\unit\models;
 
-class LoginFormTest extends \PHPUnit_Framework_TestCase
+class LoginFormTest extends \tests\_helpers\TestCase
 {
 
-    protected function setUp()
-    {
-    }
-
-    protected function tearDown()
-    {
-    }
-
 }
\ No newline at end of file
diff --git a/tests/unit/models/UserTest.php b/tests/unit/models/UserTest.php
index f73e8a3..e01ce3d 100644
--- a/tests/unit/models/UserTest.php
+++ b/tests/unit/models/UserTest.php
@@ -4,7 +4,7 @@ namespace tests\unit\models;
 
 #use yii\test\DbTestTrait;
 
-class UserTest extends \PHPUnit_Framework_TestCase
+class UserTest extends \tests\_helpers\TestCase
 {
 
 	use DbTestTrait;
@@ -12,16 +12,14 @@ class UserTest extends \PHPUnit_Framework_TestCase
 	protected function setUp()
 	{
 		/*
+		 *
 		 * you can load fixtures in this way
 		 *
+		parent::setUp();
 		$this->loadFixtures([
 			'tbl_user',
 		]);
 		 */
 	}
 
-	protected function tearDown()
-	{
-	}
-
 }