fixed test break.

tests/unit/TestCase.php

 <?php
 
 namespace yiiunit;
+use yii\helpers\ArrayHelper;
 
 /**
  * This is the base class for all yii framework unit tests.
@@ -47,7 +48,7 @@ abstract class TestCase extends \PHPUnit_Framework_TestCase
 		];
 		$defaultConfig['vendorPath'] = dirname(dirname(__DIR__)) . '/vendor';
 
-		new $appClass(array_merge($defaultConfig, $config));
+		new $appClass(ArrayHelper::merge($defaultConfig, $config));
 	}
 
 	/**

tests/unit/extensions/authclient/OAuth1Test.php

@@ -11,7 +11,15 @@ class OAuth1Test extends TestCase
 {
 	protected function setUp()
 	{
-		$this->mockApplication([], '\yii\web\Application');
+		$config = [
+			'components' => [
+				'request' => [
+					'hostInfo' => 'http://testdomain.com',
+					'scriptUrl' => '/index.php',
+				],
+			]
+		];
+		$this->mockApplication($config, '\yii\web\Application');
 	}
 
 	/**

tests/unit/extensions/authclient/OAuth2Test.php

@@ -9,7 +9,15 @@ class OAuth2Test extends TestCase
 {
 	protected function setUp()
 	{
-		$this->mockApplication([], '\yii\web\Application');
+		$config = [
+			'components' => [
+				'request' => [
+					'hostInfo' => 'http://testdomain.com',
+					'scriptUrl' => '/index.php',
+				],
+			]
+		];
+		$this->mockApplication($config, '\yii\web\Application');
 	}
 
 	// Tests :