I am going to create a new app in Xamarin, and due to demands from the customer, I need to create unit test on almost everything.
In my app I am using a HttpClient, and I have to set Timeout, as the app has to upload images.
But how can I make unit tests for HttpClient.Timeout?
Everything else is mocked up using HttpMessageHandler, but inserting a Task.Delay in there does not affect it.
EDIT
Added code for clarification
public async Task ExecuteAsync_NotExecutedWithinTimeout_ThrowsExecption() { // Arrange var endpoint = "http://google.dk/"; var method = HttpMethod.Get; var timeoutClient = TimeSpan.FromMilliseconds(2); var timeoutServer = TimeSpan.FromMilliseconds(10); var requestor = new Requestor(new MessageHandler { Method = HttpMethod.Get, Timeout = timeoutServer, URL = url }); bool result = false; // Act try { await requestor.ExecuteAsync(method, endpoint, timeout: timeoutClient); } catch (TimeoutException) { result = true; } // Assert Assert.AreEqual(true, result); } class MessageHandler : HttpMessageHandler { public TimeSpan? TimeOut { get; set; } protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) { if (Timeout.HasValue) await Task.Delay(Timeout.Value); return new HttpResponseMessage(System.Net.HttpStatusCode.OK); } } class Requestor { public async Task<string> ExecuteAsync(HttpMethod httpMethod, string endpoint, TimeSpan? timeout = default(TimeSpan?)) { using (var client = GetHttpClient()) { if (timeout.HasValue) { client.Timeout = timeout.Value; } var response = await client.GetAsync(endpoint); } } } private HttpClient GetHttpClient() { var client = _messageHandler == null ? new HttpClient() : new HttpClient(_messageHandler, false); client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); return client; } 
