Here is a use case that has nothing to do with global state:

Let's say I'm using Substitue to mock a dependency and give it some default behavior. This default behavior is appropriate for 99% of my tests so I have it as part of my common test setUp() routine, which is also doing a lot of other common setup before each test. But for one of my tests I need this substitute to do something different. I still want to be able to call setUp because of all the other useful shared code it contains, but now I want to override the assigned default behavior of that mock.

Sketch:

function setUp() {
   const fooSub = Substitute.for<Foo>();
   fooSub.bar(Arg.any()).returns('hello');
   ...
   ... // Here I am setting up a dozen other common mocks and behaviors
   ...
   return {
      fooSub,
      // and all the others
   };
}

it('tests the weird corner case', () => {
   const { fooSub } = setUp();
   // Need fooSub to do something a bit different for this test.
   fooSub.bar(Arg.any()).returns('world'); // <-- won't work, can't update the behavior.
   ...
});

Uh oh!

Is there a way to reset the mocks? #46

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