adding unit tests for delete

tests/lib/ocs/privatedata.php

@@ -74,6 +74,22 @@ class Test_OC_OCS_Privatedata extends PHPUnit_Framework_TestCase
 		$this->assertOcsResult(2, $result);
 	}
 
+	/**
+	 * @dataProvider deleteWithEmptyKeysProvider
+	 */
+	public function testDeleteWithEmptyKeys($params) {
+		$result = OC_OCS_Privatedata::delete($params);
+		$this->assertEquals(101, $result->getStatusCode());
+	}
+
+	public function deleteWithEmptyKeysProvider() {
+		return array(
+			array(array()),
+			array(array('app' => '123')),
+			array(array('key' => '123')),
+		);
+	}
+
 	/**
 	 * @param \OC_OCS_Result $result
 	 */