NSURLSession completion block not called

Question

var session = NSURLSession.sharedSession()
session.dataTaskWithRequest(urlRequest, 
                            completionHandler: {(data: NSData!, 
                             


        

Answer 1

This is a fairly unique case, but if you're using a URLSession inside a unit test, you'll need to setup the expectations. Otherwise, your test case will end and it will appear that your request is never returning. Swift 3.0.1.

    let expect = expectation(description: "dataTaskWithRequest - completes")

    if let url = URL(string: "https://www.google.com/") {

        let request = URLRequest(url: url)

        URLSession.shared.dataTask(with: request) { ( data, response, error) in

            print(data.debugDescription)
            print(response.debugDescription)
            print(error.debugDescription)

            expect.fulfill()

        }.resume()

        waitForExpectations(timeout: 10, handler: nil)
    }