example of registering a mock call on the mock object.

mock_testcall.go

Context("ReadPersonFromS3 -- using mock", func() {
        bucket := "testbucket"
        key := "persondata.txt"
        objectInput := &s3.GetObjectInput{
                Bucket: aws.String(bucket),
                Key:    aws.String(key),
        }
        goodObjectOutput := &s3.GetObjectOutput{
                Body: S3Fetcher.NewMockBody([]byte(goodJson)),
        }
        BeforeEach(func() {
                mockFetcher = mock_S3Fetcher.NewMockS3Fetcher(ctrl)
        })
        Context("reads data from S3", func() {
                var testCall *gomock.Call
                BeforeEach(func() {
                        testCall = mockFetcher.EXPECT().GetObject(objectInput).Return(goodObjectOutput, nil).AnyTimes()
                })
                It("and succeeds", func() {
                        Expect(ReadPersonFromS3(mockFetcher)).To(HaveLen(2))
                        testCall.Times(1)
                })
        })
})