concertina

midi_test.go

 1package midi
 2
 3import (
 4	"math/bits"
 5	"testing"
 6)
 7
 8// WriteCounter just counts how many bytes were written
 9type WriteCounter struct {
10	len int
11}
12func (w *WriteCounter) Write(p []byte) (int, error) {
13	w.len += len(p)
14	return len(p), nil
15}
16
17func (n *Polyphony) OnesCount() int {
18	return bits.OnesCount64(n.playing[0]) + bits.OnesCount64(n.playing[1])
19}
20
21func TestWriter(t *testing.T) {
22	counter := new(WriteCounter)
23	w := NewWriter(counter, 0)
24
25	if w.Playing.OnesCount() != 0 {
26		t.Error("polyphony tracking is busted")
27	}
28
29	w.NoteOn(12)
30	if w.Playing.OnesCount() != 1 {
31		t.Error("polyphony tracking is busted")
32	}
33
34	w.NoteOn(12)
35	if w.Playing.OnesCount() != 1 {
36		t.Error("polyphony tracking is busted")
37	}
38
39	w.NoteOn(20)
40	if w.Playing.OnesCount() != 2 {
41		t.Error("polyphony tracking is busted")
42	}
43
44	w.NoteOn(20)
45	if w.Playing.OnesCount() != 2 {
46		t.Error("polyphony tracking is busted")
47	}
48
49	w.NoteOff(12)
50	if w.Playing.OnesCount() != 1 {
51		t.Error("polyphony tracking is busted")
52	}
53
54	w.NoteOff(12)
55	if w.Playing.OnesCount() != 1 {
56		t.Error("polyphony tracking is busted")
57	}
58
59	w.NoteOff(20)
60	if w.Playing.OnesCount() != 0 {
61		t.Error("polyphony tracking is busted")
62	}
63}