diff --git a/tests/php-unit-tests/unitary-tests/core/OQLTest.php b/tests/php-unit-tests/unitary-tests/core/OQLTest.php
index d6d7674ae..6db3fadb0 100644
--- a/tests/php-unit-tests/unitary-tests/core/OQLTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/OQLTest.php
@@ -41,10 +41,11 @@ class OQLTest extends ItopDataTestCase
 		utils::GetConfig()->Set('apc_cache.enabled', false, 'test');
 		utils::GetConfig()->Set('query_cache_enabled', false, 'test');
 		utils::GetConfig()->Set('expression_cache_enabled', false, 'test');
+
 		$sConfigFile = utils::GetConfig()->GetLoadedFile();
 		@chmod($sConfigFile, 0770);
-		utils::GetConfig()->WriteToFile();
-		@chmod($sConfigFile, 0444); // Read-only
+		$oConfig->WriteToFile();
+		@chmod($sConfigFile, 0444);
 	}
 
 	/**
diff --git a/tests/php-unit-tests/unitary-tests/core/iTopConfigParserTest.php b/tests/php-unit-tests/unitary-tests/core/iTopConfigParserTest.php
index fd47d9a74..e096c9981 100644
--- a/tests/php-unit-tests/unitary-tests/core/iTopConfigParserTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/iTopConfigParserTest.php
@@ -44,10 +44,10 @@ class iTopConfigParserTest extends ItopTestCase
 		parent::tearDown();
 		if ($this->conf_exists) {
 			// restoring config that was in place before the test
-			$sBackupConfigFileContent = file_get_contents($this->tmpSavePath);
-			$hItopConfigFile = @fopen($this->sConfigPath, 'w');
-			fwrite($hItopConfigFile, $sBackupConfigFileContent);
-			fclose($hItopConfigFile);
+			@chmod($this->sConfigPath, 0770);
+			$bRenameResult = rename($this->tmpSavePath, $this->sConfigPath);
+			echo "Restored config file, result={$bRenameResult}";
+			@chmod($this->sConfigPath, 0440);
 		}
 	}
 
diff --git a/tests/php-unit-tests/unitary-tests/webservices/RestTest.php b/tests/php-unit-tests/unitary-tests/webservices/RestTest.php
index 37fad99c0..641523fb9 100644
--- a/tests/php-unit-tests/unitary-tests/webservices/RestTest.php
+++ b/tests/php-unit-tests/unitary-tests/webservices/RestTest.php
@@ -42,20 +42,16 @@ class RestTest extends ItopDataTestCase
 		    unlink($this->sTmpFile);
 	    }
 
-		$sConfigFile = \utils::GetConfig()->GetLoadedFile();
-		@chmod($sConfigFile, 0770);
-		$this->sUrl = \MetaModel::GetConfig()->Get('app_root_url');
-		@chmod($sConfigFile, 0444); // Read-only
+	    $this->sUrl = \MetaModel::GetConfig()->Get('app_root_url');
 
-		$oRestProfile = \MetaModel::GetObjectFromOQL("SELECT URP_Profiles WHERE name = :name", array('name' => 'REST Services User'), true);
-		$oAdminProfile = \MetaModel::GetObjectFromOQL("SELECT URP_Profiles WHERE name = :name", array('name' => 'Administrator'), true);
+	    $oRestProfile = \MetaModel::GetObjectFromOQL("SELECT URP_Profiles WHERE name = :name", array('name' => 'REST Services User'), true);
+	    $oAdminProfile = \MetaModel::GetObjectFromOQL("SELECT URP_Profiles WHERE name = :name", array('name' => 'Administrator'), true);
 
-		if (is_object($oRestProfile) && is_object($oAdminProfile))
-		{
-			$oUser = $this->CreateUser($this->sLogin, $oRestProfile->GetKey(), $this->sPassword);
-			$this->AddProfileToUser($oUser, $oAdminProfile->GetKey());
-		}
-	}
+	    if (is_object($oRestProfile) && is_object($oAdminProfile)) {
+		    $oUser = $this->CreateUser($this->sLogin, $oRestProfile->GetKey(), $this->sPassword);
+		    $this->AddProfileToUser($oUser, $oAdminProfile->GetKey());
+	    }
+    }
 
 	/**
 	 * @dataProvider BasicProvider
@@ -69,6 +65,7 @@ class RestTest extends ItopDataTestCase
 		$description = date('dmY H:i:s');
 		$sOuputJson = $this->CreateTicketViaApi($description);
 		$aJson = json_decode($sOuputJson, true);
+		$this->assertNotNull($aJson, "Cannot decode returned JSON : $sOuputJson");
 
 		if ($this->iJsonDataMode === self::MODE['NO_JSONDATA']){
 			$this->assertStringContainsString("3", "".$aJson['code'], $sOuputJson);