Easy way to mock a WCF service?

Question

I\'ve got an app which is using a WCF service. Now I\'d like to add unit tests to the app.

For some cases I need to mock the WCF service, since getting the desired b

Answer 1

You can you Moq mocking framework. Based on the example that you have provided:

ChannelFactory channelFactory = new ChannelFactory("");
IMyWcfService proxy = channelFactory.CreateChannel();
proxy.CallMyStuff();
proxy.Close();

Here is how a mocking implementation will look like:

Mock channelMock = new Mock(MockBehavior.Strict);
channelMock
    .Setup(c => c.CallMyStuff())
    .Returns("");

string myStuff = channelMock.Object.CallMyStuff();

After you have added a proxy for the WCF service - you should have a channel interface available to you, called IMyWcfServiceChannel.

Depending on the return type of service method you are calling - you can set just about any output. In the example above I used string type as an example.

In order to use the above solution more efficiently you might want to create 2 constructors for the business layer like so:

public class Example1
{
    IMyWcfServiceChannel _client;

    public Example1()
    {
        var factory = new ChannelFactory("binding");
        _client = factory.CreateChannel();
    }

    public Example1(IMyWcfServiceChannel client)
    {
        _client = client;
    }

    public string CallMyStuff()
    {
        return _client.CallMyStuff();
    }
}

So on the prod you use parameter-less constructor. In unit tests you use parameter-full constructor and pass mock to it (channelMock.Object).