TestItemsWithIncorrectArray.swift

func testGetItems_withIncorrectArray() {

        client = MyRESTClient(url: NSURL(string: "http://notRight")!, manager: manager!)
        let expectation = expectationWithDescription("GetJSONArray")
        var itemsArray: [MyItem]?
        client?.getAvailableItems { (items) -> () in
            itemsArray = items
            expectation.fulfill()
        }
        waitForExpectationsWithTimeout(5) { (error: NSError?) -> Void in
            XCTAssert(itemsArray?.count == nil, "Array should be empty when \"items\" array is missing")
        }
    }