     private static let diskCacheIdentifier = "TestDiskCache"
     private let diskCache = DiskCache(identifier: DiskCacheTests.diskCacheIdentifier)
     private let fileManager = NSFileManager()
+    private let expectationTimeout = 0.05
     
     override func setUp() {
         super.setUp()

            XCTFail("Caching data failed: \(error)")
        }

        waitForExpectationsWithTimeout(0.05, handler: nil)
    }

    func testRetrievingDataCallsCompletionHandlerWithSuccessAndData() {

            XCTFail("Retrieving data failed: \(error)")
        }

        waitForExpectationsWithTimeout(expectationTimeout, handler: nil)
    }
}

