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POHow to unit test an async method from Silverlight 5
 

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    <p>Edit: Context: I write a Silverlight application that accesses a Dynamics CRM 2011 via the Soap Service. I implemented a service for doing this. I want to write a unit test for this service now.</p> <p>I want to write a unit test for the following method:</p> <pre><code>public async Task&lt;List&lt;string&gt;&gt; GetAttributeNamesOfEntity(string entityName) { // build request OrganizationRequest request = new OrganizationRequest { RequestName = "RetrieveEntity", Parameters = new ParameterCollection { new XrmSoap.KeyValuePair&lt;string, object&gt;() { Key = "EntityFilters", Value = EntityFilters.Attributes }, new XrmSoap.KeyValuePair&lt;string, object&gt;() { Key = "RetrieveAsIfPublished", Value = true }, new XrmSoap.KeyValuePair&lt;string, object&gt;() { Key = "LogicalName", Value = "avobase_tradeorder" }, new XrmSoap.KeyValuePair&lt;string, object&gt;() { Key = "MetadataId", Value = new Guid("00000000-0000-0000-0000-000000000000") } } }; // fire request IAsyncResult result = OrganizationService.BeginExecute(request, null, OrganizationService); // wait for response TaskFactory&lt;OrganizationResponse&gt; tf = new TaskFactory&lt;OrganizationResponse&gt;(); OrganizationResponse response = await tf.FromAsync(result, iar =&gt; OrganizationService.EndExecute(result)); // parse response EntityMetadata entities = (EntityMetadata)response["EntityMetadata"]; return entities.Attributes.Select(attr =&gt; attr.LogicalName).ToList(); } </code></pre> <p>My first approach was to call the actual CRM. This failed because I cannot authenticate. I asked a question about this <a href="https://stackoverflow.com/questions/19496623/how-to-unit-test-soap-service-access-from-crm-2011-silverlight-application">here</a>. My second approach is to mock the organization service and run the method against my the mock. Like this:</p> <pre><code> private bool _callbackCalled = false; private SilverlightDataService _service; private List&lt;string&gt; names; [TestInitialize] public void SetUp() { IOrganizationService organizationService = A.Fake&lt;IOrganizationService&gt;(); _service = new SilverlightDataService {OrganizationService = organizationService}; IAsyncResult result = A.Fake&lt;IAsyncResult&gt;(); A.CallTo(organizationService.BeginExecute(A&lt;OrganizationRequest&gt;.Ignored, A&lt;AsyncCallback&gt;.Ignored, A&lt;object&gt;.Ignored)).WithReturnType&lt;IAsyncResult&gt;().Returns(result); EntityMetadata entities = new EntityMetadata(); AttributeMetadata meta = new AttributeMetadata(); meta.LogicalName = "foobar"; entities.Attributes = new ObservableCollection&lt;AttributeMetadata&gt;(); entities.Attributes.Add(meta); OrganizationResponse response = new OrganizationResponse(); response.Results = new ParameterCollection(); response["EntityMetadata"] = entities; A.CallTo(() =&gt; result.IsCompleted).Returns(true); A.CallTo(result.AsyncState).WithReturnType&lt;object&gt;().Returns(response); A.CallTo(organizationService.EndExecute(result)).WithReturnType&lt;OrganizationResponse&gt;().Returns(response); } [TestMethod] [Asynchronous] public async void TestGetAttributeNamesOfEntity() { TaskFactory&lt;List&lt;string&gt;&gt; tf = new TaskFactory&lt;List&lt;string&gt;&gt;(); names = await tf.FromAsync(_service.GetAttributeNamesOfEntity("avobase_tradeorder"), CallbackFunction); Assert.IsTrue(_callbackCalled); Assert.IsNotNull(names); } /// &lt;summary&gt; /// is used as callback for the method GetAttributeNamesOfEntity /// &lt;/summary&gt; /// &lt;param name="result"&gt;&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; private List&lt;string&gt; CallbackFunction(IAsyncResult result) { _callbackCalled = true; names = (List&lt;string&gt;) result.AsyncState; return null; } </code></pre> <p>I use FakeItEasy for mocking. When I execute this test (with ReSharper and AgUnit) it waits forever. I also tried <a href="https://stackoverflow.com/questions/11513422/silverlight-async-unit-testing">this approach</a>, but it did not work. </p> <p>1) My assumption is that my mocks dont tell the await magic that the task is actually done. Why does the await never end? What do I have to do to fix this?</p> <p>2) Is there maybe a better approach to do this?</p> <p>Edit: I am using: VS 2012 Premium, ReSharper 7.1, Silverlight 5, AgUnit 0.7, .Net 4.5, FakeItEasy 1.13.1 installed via NuGet.</p>
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