One thing I have not tackled until today was how to test a Workflow Service in a .xamlx file.  When I started out this morning working on it I realized that there isn’t a great deal of information about how to do this available anywhere.

Update 7/30/2010Download the WF4 Workflow Test Helper library for sample code

Here is what I came up with.  Look at this test and tell me what you think.

using System.Activities;

using System.Activities.Tracking;
using System.ServiceModel;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using WorkflowTestHelper.Tracking;

namespace WorkflowTestHelper.Tests
{
/// <summary>
/// This test demonstrates the WorkflowServiceTestHost class
/// </summary>
[TestClass]
public class WorkflowServiceTestHostTest
{
/// <summary>
/// The endpoint address to be used by the test host
/// </summary>
private readonly EndpointAddress _serviceAddress = new EndpointAddress("net.pipe://localhost/TestService");

/// <summary>
/// Verifies that the WorkflowServiceTestHost hosts a service and that the service receives and sends a reply
/// </summary>
/// <remarks>
/// Be sure to enable deployment - the xamlx file must be deployed
/// </remarks>
[TestMethod]
[DeploymentItem(@"WorkflowTestHelper.Tests.Activities\TestService.xamlx")]
public void ShouldHostService()
{
var trackingProfile =
new TrackingProfile
{
Queries =
{
new ActivityStateQuery
{
ActivityName = "ReceiveRequest",
States = {"Executing"},
},
new ActivityStateQuery
{
ActivityName = "SendResponse",
States = {"Executing"},
},
}
};


using (var host = WorkflowServiceTestHost.Open("TestService.xamlx", _serviceAddress.Uri, trackingProfile))
{
var client = new ServiceClient(new NetNamedPipeBinding(), _serviceAddress);
var response = client.GetData(1);
Assert.AreEqual("1", response);

host.Tracking.Trace();

// Find the tracking records for the ReceiveRequest and SendResponse

// Activity <ReceiveRequest> state is Executing
AssertTracking.ExistsAt(host.Tracking.Records, 0, "ReceiveRequest", ActivityInstanceState.Executing);

// Activity <SendResponse> state is Executing
AssertTracking.ExistsAt(host.Tracking.Records, 1, "SendResponse", ActivityInstanceState.Executing);
}
}
}
}