Mock Multiple Interfaces

When a mock is created by using Mock.Create all dependencies are also implemented. Thus, if you are interested in a specific interface implementation you can use the as operator and call the interface members.

Consider the following interface:

public interface IFoo : IDisposable 
{ 
    void Do(); 
} 

The IFoo interface has IDisposable implemented. When you are interested only in IDisposable calls, you need to perform a conversion from the created mock to IDisposable.

// Arrange 
var foo = Mock.Create<IFoo>(); 
var iDisposable = foo as IDisposable; 

Finally, check whether the dispose method invokes our mock code successfully.

bool called = false; 
 
Mock.Arrange(() => iDisposable.Dispose()).DoInstead(() => called = true); 
 
// Act 
iDisposable.Dispose(); 
 
// Assert 
Assert.IsTrue(called); 
 
Mock.Assert(() => iDisposable.Dispose(), Occurs.Once());