     let image = helper.image
     let key = "http://\(#function)"
     
-    waitUntil { done in
+    waitUntil(timeout: 5) { done in
       cache.store(image, forKey: key) {
         cache.retrieveImage(forKey: key) { image, type in
           expect(image).toNot(beNil())

    let image = helper.image
    let key = #function

    waitUntil { done in
      cache.store(image, forKey: key) {
        cache.clearMemory()
        cache.retrieveImage(forKey: key) { image, type in

    let image = helper.image
    let key = #function

    waitUntil(timeout: 5) { done in
      cache.store(image, forKey: key) {
        cache.clearMemory()
        cache.clearDisk {
