A first pass on something to make stretchr/mock outputs easier to deal with

mock_traceback.go

// Tracebacker implements the methods required to satisfy stretchr/mock's Test() interface
// Usage:
//   my := new(MockMy)
//   my.Test(&Tracebacker(t)
type Tracebacker struct {
	t *testing.T
}

func (t *Tracebacker) Logf(format string, args ...interface{}) {
	t.t.Logf(format, args...)
}

func (t *Tracebacker) Errorf(format string, args ...interface{}) {
	t.t.Errorf(format, args...)
}

func (t *Tracebacker) FailNow() {
	t.t.Helper()

	stackframes := make([]uintptr, 100)
	runtime.Callers(2, stackframes)

	stacktrace := make([]string, 0, len(stackframes))
	frames := runtime.CallersFrames(stackframes)

	var previousWasTestifyMock bool
	for f, more := frames.Next(); more; f, more = frames.Next() {
		if strings.HasPrefix(f.Function, "github.com/stretchr/testify/mock") {
			previousWasTestifyMock = true
			continue
		} else if f.Function == "testing.tRunner" {
			previousWasTestifyMock = false
			continue
		}

		if previousWasTestifyMock { // most likely the mockery generated caller of the mock package
			previousWasTestifyMock = false
			continue
		}

		stacktrace = append(stacktrace, fmt.Sprintf("\t%s:%d %s", f.File, f.Line, f.Function))
	}

	t.t.Logf("Mock callers:\n%s", strings.Join(stacktrace, "\n"))

	t.t.FailNow()
}