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POHow to Unit Test a ViewModel with async method.
 

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    <p>I am not sure where to start but let me give you a brief idea on where I am and what I want to achieve. I am quite new to Unit Testing on MVVM and having difficulty on testing the commands that I exposed using PRISM delegate command properties. My delegate commands calls async method that has to be waited so I can get the actual result. Below is an asyc method that is called by method that I wanted to test.</p> <pre><code> async void GetTasksAsync() { this.SimpleTasks.Clear(); Func&lt;IList&lt;ISimpleTask&gt;&gt; taskAction = () =&gt; { var result = this.dataService.GetTasks(); if (token.IsCancellationRequested) return null; return result; }; IsBusyTreeView = true; Task&lt;IList&lt;ISimpleTask&gt;&gt; getTasksTask = Task&lt;IList&lt;ISimpleTask&gt;&gt;.Factory.StartNew(taskAction, token); var l = await getTasksTask; // waits for getTasksTask if (l != null) { foreach (ISimpleTask t in l) { this.SimpleTasks.Add(t); // adds to ViewModel.SimpleTask } } } </code></pre> <p>also here is the command in my VM that calls the async method above</p> <pre><code> this.GetTasksCommand = new DelegateCommand(this.GetTasks); void GetTasks() { GetTasksAsync(); } </code></pre> <p>and now my Test Method goes like </p> <pre><code> [TestMethod] public void Command_Test_GetTasksCommand() { MyViewModel.GetTaskCommand.Execute(); // this should populate ViewModel.SimpleTask Assert.IsTrue(MyBiewModel.SimpleTask != null) } </code></pre> <p>Currently what I am getting is that my ViewModel.SimpleTask = null this is because it does not wait for the async method to finish. I understand there are some related topics to this already in stack overflow but I could not find something related to my DelegateCommands. </p>
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