     let delayTime = dispatch_time(DISPATCH_TIME_NOW,
       Int64(2 * Double(NSEC_PER_SEC)))
     dispatch_after(delayTime, dispatch_get_main_queue()) {
-      cache.get("http://www.google.de", onSuccess: { value in
+      cache.get(testToFetch, onSuccess: { value in
         println("Fetched successfully \(value)")
-        }, onFailure: { error in
-          println("Error \(error) during fetch")
+      }, onFailure: { error in
+        println("Error \(error) during fetch")
       })
     }
   }

}

class TestCache2: CacheLevel {
  typealias KeyType = Int
  typealias OutputType = Int
  
  func get(fetchable: KeyType, onSuccess success: (OutputType) -> Void, onFailure failure: (NSError?) -> Void) {
    


class TestCache: CacheLevel {
  typealias KeyType = NSURL
  typealias OutputType = NSData
  
  func get(fetchable: KeyType, onSuccess success: (OutputType) -> Void, onFailure failure: (NSError?) -> Void) {
  }
