I find the mocking/stubbing in Go awkward. You have to implement all mocked methods, and if you want to record certain calls, you have a lot more code to write.

Let's translate the example to Java:

  public interface Job {
    int getPriority();
    void doWork();  // do is a reserved word
  }

Then, to mock it with JMockit:

  new Expectations() {{
    job.getPriority(); result = 1;
    job.doWork(); times = 1;
  }};

These 4 lines replace all this Go code:

  var Done bool

  type DummyJob struct {
  }

  func (j DummyJob) Priority() int {
    return 1
  }

  func (j DummyJob) Do() error {
    Done = true
    return nil
  }

If you imagine some larger interface, it would be a lot of code in Go. Mocking in Go isn't fun.