ch = make(chan struct{})
	called := make(chan struct{})
	go func() {
		Until(func() {
			called <- struct{}{}
		}, 0, ch)
		close(called)
	}()
	<-called
	close(ch)
	<-called
}

func TestUntilWithContext(t *testing.T) {
	ctx, cancel := context.WithCancel(context.TODO())
	cancel()
	UntilWithContext(ctx, func(context.Context) {
		t.Fatal("should not have been invoked")
	}, 0)