@jbrains:disqus I understand the exponential nature of branches to the power of the layers. What I don't understand is how this test methodology reduces the number of tests you have to write. The way you describe it in the video doesn't seem to decrease the number of tests more than marginally, when I draw out a tree of branching pathways.
The main benefit of mocking/stubbing of tests that I see, is that you're testing closely to the component, rather than *needing* to consider all the implications of all the pathways underneath that component. i.e. you're more likely to think of all the potential use cases when the testing is narrowly focused on just that component.