add one simple cache test

apps/user_ldap/tests/group_ldap.php

@@ -59,10 +59,7 @@ class Test_Group_Ldap extends \PHPUnit_Framework_TestCase {
 	private function enableGroups($access) {
 		$access->connection->expects($this->any())
 			   ->method('__get')
-			   ->will($this->returnCallback(function($name) {
-// 					if($name === 'ldapLoginFilter') {
-// 						return '%uid';
-// 					}
+			   ->will($this->returnCallback(function() {
 					return 1;
 			   }));
 	}
@@ -269,4 +266,32 @@ class Test_Group_Ldap extends \PHPUnit_Framework_TestCase {
 		$this->assertSame(false, $gid);
 	}
 
+	/**
+	 * tests whether Group Backend behaves correctly when cache with uid and gid
+	 * is hit
+	 */
+	public function testInGroupHitsUidGidCache() {
+		$access = $this->getAccessMock();
+		$this->enableGroups($access);
+
+		$uid = 'someUser';
+		$gid = 'someGroup';
+		$cacheKey = 'inGroup'.$uid.':'.$gid;
+		$access->connection->expects($this->once())
+			->method('isCached')
+			->with($cacheKey)
+			->will($this->returnValue(true));
+
+		$access->connection->expects($this->once())
+			->method('getFromCache')
+			->with($cacheKey)
+			->will($this->returnValue(true));
+
+		$access->expects($this->never())
+			->method('username2dn');
+
+		$groupBackend = new GroupLDAP($access);
+		$groupBackend->inGroup($uid, $gid);
+	}
+
 }