feature: stack-like `fake.functionReturns`

[andreasscherman]

Hi!

As far as I can tell, we have two ways of issuing return values to a generated fake struct in counterfeiter. The first is to simply record a value which it returns, and the second one is to enumerate on which nth call a certain value is returned.

A feature which I would find useful would be to have a "stack" approach as well, where you would be able to rather than enumerate the return values, just put them on a stack-like object.

That is, rather than:

fake.functionReturnsOnCall(0, 5)
fake.functionReturnsOnCall(1, 6)

You'd be able to simply:

fake.functionReturns(5)
fake.functionReturns(6)

My use-case for this is currently to have a fake http client, and I have separate functions which you'd I'd to push a certain return value on it.

func (s object) setupAuthenticate() {
  s.httpClient.DoReturns("...")
}

func (s object) setupGetPost() {
  s.httpClient.DoReturns("...")
}

func HelloWorldTest(t) {
  setupAuthenticate()
  setupGetPost()
  // this function calls both an "authentication" and a "getPost" endpoint
  call('/post/5') 
}

I can of course enumerate the return calls inside the functions, but it'd lead to a lot higher coupling between the setup functions. I can also make a wrapper for this, but I think it's not an unreasonable thing to have inside the counterfeiter fake itself either!

[rittneje]

I know this issue is from almost two years ago, but I just wanted to let you know there is actually a third way of specifying return values. You can set the DoStub field to a function that will be called when the Do method is invoked. So you could just make a stack object yourself to keep track of things, and then have DoStub just pop off that stack.