resource_handler_stubbing_and_verification_snippet.go

// Stubbing:
When(updater.NotifyUploadSucceeded(AnyString(), AnyString(), AnyString())).
  ThenReturn(fmt.Errorf("Some error"))

// Exercise object under test:
handler.AddOrReplace(responseWriter, ..., map[string]string{"identifier": "someguid"})

// Verification:
blobstore.VerifyWasCalledOnce().Put(EqString("someguid"), AnyReadSeeker())
updater.VerifyWasCalled(Never()).NotifyUploadFailed(AnyString(), AnyError())