Mock internal concrete methods

Question

How I should mock below lines?

            ABCRepository abcObj = new ABCRepository();
            var model = new NamesList
            {
                ALayoutNames = abcObj.ALayout(),
                BLayoutNames = abcObj.BLayout(),
                CLayoutNames = abcObj.CLayout(),
                DLayoutNames = abcObj.DLayout(),
                ELayoutNames = abcObj.ELayout()
            };

I have mocked first line with its interface like below

Mock<IABCRepository> _iabcrepository = new Mock<IABCRepository>();

But how to proceed for NamesList object?

Answer 1

This needs a bit of refactoring. That is why I find that Unit Tests help create a better code.

So here it goes, step by step:

1. Move the ABCRepository in the constructor as an argument of your class i.e.

    public class ClassToTest {
        private IABCRepository abcObj;

        public ClassToTest(IABCRepository repo) {
             this.abcObj = repo;
        } 

        public DoingSomething() {
            var model = new NamesList
            {
                ALayoutNames = this.abcObj.ALayout(),
                BLayoutNames = this.abcObj.BLayout(),
                CLayoutNames = this.abcObj.CLayout(),
                DLayoutNames = this.abcObj.DLayout(),
                ELayoutNames = this.abcObj.ELayout()
            };
        }
    }

2. In your test you need to do two things, first setup the mock responses

    Mock<IABCRepository> _iabcrepository = new Mock<IABCRepository>();
    _iabcrepository.Setup(foo => foo.ALayout()).Returns(MockValue);
    _iabcrepository.Setup(foo => foo.BLayout()).Returns(MockValue);
    // etc

3. In your test (or init, or wherever you create the instance to be tested) now create the mock object and pass it through the constructor

    var classToTest = new ClassToTest(_iabcrepository.Object);

Now when you call the DoSomething function, the mocked repository will return the mocked values.