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copied!<p>You'll need to do some dependency injection to get your mock into your class-under-test (for more information on DI, check out <a href="http://www.martinfowler.com/articles/injection.html" rel="nofollow">this article</a> by Martin Fowler). First your 'dataComponentService' class will need to implement an interface:</p> <pre><code>public interface IDataComponentService { boolean CheckIfUserExist(String user); } </code></pre> <p>Then you can inject classes that implement that interface into your CustomerService class by adding an appropriate constructor:</p> <pre><code>public class CustomerService { private IDataComponentService _dataComponentService // This constructor allows you to inject your dependency into the class public CustomerService(IDataComponentService dataComponentService) { _dataComponentService = dataComponentService; } Public void Register() { Action1(); Action2(); } private action1 () { //this is a call to other dll. var isExist = _dataComponentService.CheckIfUserExist(userName); } private action2() { //do some more work... // Call to dataComponentService. write some data in the database.... } } </code></pre> <p>Now, in your test code your tests you can create a mock of an IDataComponentService...</p> <pre><code>var dataComponentServiceMock = MockRepository.GenerateMock<IDataComponentService>(); //add mock's behavior here... </code></pre> <p>... and pass it into your class-under-test thus...</p> <pre><code>var objUt = new CustomerService(dataComponentServiceMock); objUt.Register(); // check method calls to the mock here... </code></pre>

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