Thanks so much for your answer, Julian, that makes total sense! I guess the
examples I've seen so far are missing these more "advanced" use cases :)
Appreciate the quick and informative reply.
On Wed, Apr 5, 2017 at 4:13 PM, Julian Phillips <jul...@quantumfyre.co.uk>
wrote:
> On 05/04/2017 18:06, Jonathan Yu wrote:
>
>> Hi everyone,
>>
>> I've been using gomock to generate mock objects (in source mode), and it's
>> been pretty great - way better than maintaining similar code on my own.
>> One
>> thing that I find curious, though, is that expectations are recorded using
>> a generic interface{} type, rather than the original type.
>>
>> For example, in the sample mock_user.go
>> <https://github.com/golang/mock/blob/master/sample/mock_user/mock_user.go
>> >
>> file, we have:
>>
>> func (_m *MockIndex) Anon(_param0 string) {
>> _m.ctrl.Call(_m, "Anon", _param0)
>> }
>>
>> func (_mr *_MockIndexRecorder) Anon(arg0 interface{}) *gomock.Call {
>> return _mr.mock.ctrl.RecordCall(_mr.mock, "Anon", arg0)
>> }
>>
>> Does anyone know why the Recorder interface is generated with interface{}?
>> Doesn't this mean that we lose type safety when defining expectations?
>> After all, you can do: mock.EXPECT().Anon(123) even though the method must
>> be called with a string parameter, right?
>>
>
> Because you _don't_ have to use a value of the appropriate type when
> setting up the expectations, e.g.:
>
> "mock.EXPECT().Anon(gmock.Any())" or "mock.EXPECT().Anon(gomock.Not
> ("invalid"))"
>
> in fact "mock.EXPECT().Anon("123")" is actually a shortcut for
> "mock.EXPECT.Anon(gomock.Eq("123"))"
>
> (see https://godoc.org/github.com/golang/mock/gomock#Matcher)
>
> HTH,
>
> --
> Julian
>
--
Jonathan Yu / *@jawnsy* on LinkedIn <https://linkedin.com/in/jawnsy>,
Twitter <https://twitter.com/jawnsy>, GitHub <https://github.com/jawnsy>,
Facebook <https://facebook.com/jawnsy>
*“Ever tried. Ever failed. No matter. Try again. Fail again. Fail better.”* —
Samuel Beckett, Worstward Ho (1983)
“In an adaptive environment, winning comes from adapting to change by
continuously experimenting and identifying new options more quickly and
economically than others. The classical strategist's mantra of sustainable
competitive advantage becomes one of serial temporary advantage.” — Navigating
the Dozens of Different Strategy Options
<https://hbr.org/2015/06/navigating-the-dozens-of-different-strategy-options>
(HBR)
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