Allow getting the mock from the instance

[stephenh]

instance allows you to go from mock -> instance, but I need to go the other way.

The reason is that I want to have one part of my test setup my mocks, e.g.:

const dependencies = {
  depA = instance(mock(...)),
  depB = instance(mock(...)),
  depC = instance(mock(...))
}

And then later do when(dependencies.depA.whatever()) but depA is the instance.

How can I get the mock for a given instance?

[stephenh]

I almost filed this issue again b/c I'm looking at ts-mockito again and this is still a blocker. I.e. in test code like:

it("uses a mock", () => {
  // ctx / ctx.foo is created with a mock(Foo)
  const ctx = getAppContext(); 

  // ctx.foo is an instance so that this works
  runBusinessLogic(ctx);

  // however since ctx.foo is an instance, the `when` calls fail
  when(ctx.foo.doSomething()).thenReturn("asdf");
});

What I'd like to do is:

  const mockFoo = mock(ctx.foo);
  when(mockFoo.doSomething()).thenReturn("asdf");

I.e. when I call mock with an existing mock instance, it'd return the mock for that instance, instead of a brand new mock. I believe this could be done without a breaking change...although the mock(clazz?: any) typing might get in the way.

Alternatively a new method like getMock would be a cleaner change. Reusing mock in both "create new mock" and "return mock of instance" might be too cute.