Silverlight Unit Test Framework has an [Asynchronous] attribute (AsynchronousAttribute) that causes the tests to only end when EnqueueTestComplete() gets called. This allows for a simple way to write tests that need to wait for an event to occur before they end. Now I am trying to pick a favorite general purpose unit test framework out of the ones that seem to be the most popular choices - VSUTF, NUnit, xUnit.NET, MbUnit and I was wondering - how you would do asynchronous testing using these frameworks?
I suppose I can roll out out some custom code that will do Monitor.Wait or ResetEventWaitOne and call it at the end of the test method, then do a Pulse/Set when the test is over, but I was looking if there is an existing common/built-in solution.
This is a sample of how it is done in SUT (from http://smartypantscoding.com/a-cheat-sheet-for-unit-testing-silverlight-apps-on-windows-phone-7).
[TestClass]
public class AsyncTests : SilverlightTest
{
[Asynchronous]
[TestMethod]
public void AsyncAppendStringTest()
{
var appendStrings = new List<string>() { "hello", "there" };
StringJoiner.AsyncAppendStringsWithDashes(appendStrings, (returnString) =>
{
Assert.IsTrue(string.Compare(returnString, "hello-there") == 0);
EnqueueTestComplete();
});
}
}
Visual Studio now supports tests that have the async Task signature and the tests complete when the async method completes.