Mocking generic method call for any given type parameter

Question

I have an interface

public interface IDataProvider
{
    T GetDataDocument(Guid document) where T:class, new()
}

I\'d like to mock

Answer 1

I had a similar issue, I chose against using a stub in this situation as I did not want additions to the interface being tested to require immediate changes to the test code. i.e. adding a new method should not break my existing tests.

To get the mock working I added all the public type in a given assembly at runtime.

//This is fairly expensive so cache the types
static DummyRepository()
{
    foreach( var type in typeof( SomeTypeInAssemblyWithModelObjects ).Assembly.GetTypes() )
    {
        if( !type.IsClass | type.IsAbstract || !type.IsPublic || type.IsGenericTypeDefinition )
        {
            continue;
        }

        g_types.Add( type );
    }
}

public DummyRepository()
{
    MockRepository = new Mock();

    var setupLoadBy = GetType().GetMethod( "SetupLoadBy", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.InvokeMethod );

    foreach( var type in g_types )
    {
        var loadMethod = setupLoadBy.MakeGenericMethod( type );
        loadMethod.Invoke( this, null );
    }
}

private void SetupLoadBy()
{
    MockRepository.Setup( u => u.Load( It.IsAny() ) ).Returns( LoadById );
}

public T LoadById( long id )
{
}