func TestBatchedError(t *testing.T) {
	b := batched(func(p []byte) error { return errors.New("failure") }, 5)
	if b(make([]byte, 13)) == nil {
		t.Fatal("batched function should have returned an error")
	}
}

func TestBatchedEmpty(t *testing.T) {
	b := batched(func(p []byte) error { return errors.New("failure") }, 5)
	if b(make([]byte, 0)) != nil {
		t.Fatal("empty slice should always return successful")
	}