Performing unit testing with nested dependencies and Factory classes

Question

I\'m new to unit testing and PHPUnit, but I\'ve reading a lot lately about design patterns and isolated tests and I\'ve decided to refactor an application I\'m working on to get

Answer 1

You can test it with inheritance.

Just extend House with a FakeHouse for testing, and then check $material, $door and $knob etc. whether they've changed or not after testing.