ruby on rails - writing spec for method that hits a web service -

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i'm writing spec verify video model create proper thumbnail vimeo video when created. looks this:

    "creates thumbnail url"       vimeo_url = "http://player.vimeo.com/video/12345"       vid = factory.build(:video, video_url:vimeo_url)       # thumbnail created when saved       vid.save!        expect         uri.parse(vid.thumbnail_url)       end.to_not raise_error     end

the problem test super slow because has hit vimeo.com. i'm trying stub method calls server. 2 questions:

1) correct way/time stub something

2) if yes, how stub it? in video model have method called get_vimeo_thumbnail() hits vimeo.com. want stub method. if in spec vid.stub(:get_vimeo_thumbnail).and_return("http://someurl.com") doesn't work. when run test still hits vimeo.com.

the vcr gem worth considering. hits real web service first time run , records response can replayed next time run test (making subsequent tests fast).

i can't see wrong stub call making if calling stub before save!.


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