if got != expected {
			return fmt.Errorf("wanted default revision %q, got %q", expected, got)
		}
		return nil
	}, retry.Timeout(time.Second*10), retry.BackoffDelay(time.Millisecond*10))
}

func expectRevisionChan(t test.Failer, revisionChan chan string, expected string) {
	select {
	case rev := <-revisionChan:
		if rev != expected {
			t.Fatalf("expected revision %q to be produced on chan, got %q", expected, rev)
		}