Question

public class MyClass: AbstractBase
{
    public override bool Init(IAppContext contextIn)
    {
        if (base.Init(contextIn))
        {
            //my code 
        }
    }
}

I have a class as given above and wanted to write a unit test for the Init method and have mocked the IAppContext. How can I use mock to bypass the call to base?

This is what i am doing:

Mock<IAppContext> mockContex = new Mock<IAppContext >();
MyClass myClassInstance - new MyClass ();
myClassInstance.Init(mockContex.object);

The base.init looks like:

public virtual bool Init(IAppContext context_in) 
{
    if (context_in == null)
    {
        throw new ArgumentNullException("context_in", "IAppContext argument s null"); 
    } 
    this.myCommunication = context_in.getInterface<ICommunication>();
    if (this.myCommunication == null)
    { 
        throw new ArgumentNullException("myCommunication", "ICommunication argument is null");
    } 
    this.myStateManager = new IStateManager(this.myCommunication);
    if (this.myStateManager == null)
    { 
        throw new InvalidOperationException("Could not create the State Manager");
    }
    return true; 
} 

Answer 1

You can setup your IAppContext mock in a way that base.Init will return true:

var communicationFake = new Mock<ICommunication>();
var appContextMock = new Mock<IAppContext>();

appContextMock
    .Setup(c => c.getInterface<ICommunication>())
    .Returns(communicationFake.Object);

Now base.Init will return true when called with appContextMock.

Note that you don’t need your last null check (this.myStateManager == null) – the only way for new IStateManager(this.myCommunication) to fail, is to throw exception. If it does, it won’t get to null check part anyways.