Mocking WCF Services

In my last post I showed how to decouple the service consumer from the service proxy using the ServiceLocator pattern.

In order to mock the WCF service, it is necessary to create the following ServiceClientStub:

public class ServiceClientStub<TServiceInterface> : IServiceClient<TServiceInterface>
        where TServiceInterface : class
{
  private TServiceInterface serviceMock;

  public ServiceClientStub(TServiceInterface serviceMock)
  {
    this.serviceMock = serviceMock;
  }

  public TServiceInterface Service 
  {
    get { return serviceMock; }
  }

  public void Dispose() { }
}

This allows you to test the service consumer without the service implementation (using Moq):

var result = ...
var mock = new Mock<IServiceA>();
mock.Setup(s => s.Operation()).Returns(result);
ServiceLocator.Register<IServiceClient<IServiceA>>(
    () => new ServiceClientStub<IServiceA>(mock.Object));