How to mock an inline function

Question

I am trying to mock a function using GoMonkey, but I found it failed because compiler will be inline this function when program compiles, so GoMonkey can't mock it.

So how can I mock this function or how can I mock a other member's private function?

Test Code Like this:

        patches := gomonkey.ApplyFunc(time.ParseInLocation, func(format string, timeStr string, cstSh *time.Location) (time.Time,error) {
            return time.Time{},errors.New("error")
        })
        defer patches.Reset()
        resp:= Example("")
        So(resp, ....)

mock function

...
t, err := time.ParseInLocation(format, timeStr, cstSh)
...

Stop that mocking crap. Mocking is a technique from Java/C#/PHP which _doesn't_ work well with Go. — Volker, Aug 02 '21 at 05:40
1. Don't use mocks. 2. Even if you do use mocks, use a proper mocking library, not GoMonkey. — Jonathan Hall, Aug 02 '21 at 08:29

score 0 · Answer 1 · answered Aug 03 '21 at 08:50

You can prevent the go compiler from inlining functions using the pragma //go:noinline though as per the previous replies I would avoid the use of mocking if it's at all possible. In addition, use of these pragmas is also not a particularly good idea.

How to mock an inline function

1 Answers1