1// Copyright 2014 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package http2
6
7import "testing"
8
9func TestFlow(t *testing.T) {
10	var st flow
11	var conn flow
12	st.add(3)
13	conn.add(2)
14
15	if got, want := st.available(), int32(3); got != want {
16		t.Errorf("available = %d; want %d", got, want)
17	}
18	st.setConnFlow(&conn)
19	if got, want := st.available(), int32(2); got != want {
20		t.Errorf("after parent setup, available = %d; want %d", got, want)
21	}
22
23	st.take(2)
24	if got, want := conn.available(), int32(0); got != want {
25		t.Errorf("after taking 2, conn = %d; want %d", got, want)
26	}
27	if got, want := st.available(), int32(0); got != want {
28		t.Errorf("after taking 2, stream = %d; want %d", got, want)
29	}
30}
31
32func TestFlowAdd(t *testing.T) {
33	var f flow
34	if !f.add(1) {
35		t.Fatal("failed to add 1")
36	}
37	if !f.add(-1) {
38		t.Fatal("failed to add -1")
39	}
40	if got, want := f.available(), int32(0); got != want {
41		t.Fatalf("size = %d; want %d", got, want)
42	}
43	if !f.add(1<<31 - 1) {
44		t.Fatal("failed to add 2^31-1")
45	}
46	if got, want := f.available(), int32(1<<31-1); got != want {
47		t.Fatalf("size = %d; want %d", got, want)
48	}
49	if f.add(1) {
50		t.Fatal("adding 1 to max shouldn't be allowed")
51	}
52}
53
54func TestFlowAddOverflow(t *testing.T) {
55	var f flow
56	if !f.add(0) {
57		t.Fatal("failed to add 0")
58	}
59	if !f.add(-1) {
60		t.Fatal("failed to add -1")
61	}
62	if !f.add(0) {
63		t.Fatal("failed to add 0")
64	}
65	if !f.add(1) {
66		t.Fatal("failed to add 1")
67	}
68	if !f.add(1) {
69		t.Fatal("failed to add 1")
70	}
71	if !f.add(0) {
72		t.Fatal("failed to add 0")
73	}
74	if !f.add(-3) {
75		t.Fatal("failed to add -3")
76	}
77	if got, want := f.available(), int32(-2); got != want {
78		t.Fatalf("size = %d; want %d", got, want)
79	}
80	if !f.add(1<<31 - 1) {
81		t.Fatal("failed to add 2^31-1")
82	}
83	if got, want := f.available(), int32(1+-3+(1<<31-1)); got != want {
84		t.Fatalf("size = %d; want %d", got, want)
85	}
86
87}
88