1// Copyright 2017 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 time_test
6
7import (
8	"strings"
9	"testing"
10	. "time"
11)
12
13func TestHasMonotonicClock(t *testing.T) {
14	yes := func(expr string, tt Time) {
15		if GetMono(&tt) == 0 {
16			t.Errorf("%s: missing monotonic clock reading", expr)
17		}
18	}
19	no := func(expr string, tt Time) {
20		if GetMono(&tt) != 0 {
21			t.Errorf("%s: unexpected monotonic clock reading", expr)
22		}
23	}
24
25	yes("<-After(1)", <-After(1))
26	ticker := NewTicker(1)
27	yes("<-Tick(1)", <-ticker.C)
28	ticker.Stop()
29	no("Date(2009, 11, 23, 0, 0, 0, 0, UTC)", Date(2009, 11, 23, 0, 0, 0, 0, UTC))
30	tp, _ := Parse(UnixDate, "Sat Mar  7 11:06:39 PST 2015")
31	no(`Parse(UnixDate, "Sat Mar  7 11:06:39 PST 2015")`, tp)
32	no("Unix(1486057371, 0)", Unix(1486057371, 0))
33
34	yes("Now()", Now())
35
36	tu := Unix(1486057371, 0)
37	tm := tu
38	SetMono(&tm, 123456)
39	no("tu", tu)
40	yes("tm", tm)
41
42	no("tu.Add(1)", tu.Add(1))
43	no("tu.In(UTC)", tu.In(UTC))
44	no("tu.AddDate(1, 1, 1)", tu.AddDate(1, 1, 1))
45	no("tu.AddDate(0, 0, 0)", tu.AddDate(0, 0, 0))
46	no("tu.Local()", tu.Local())
47	no("tu.UTC()", tu.UTC())
48	no("tu.Round(2)", tu.Round(2))
49	no("tu.Truncate(2)", tu.Truncate(2))
50
51	yes("tm.Add(1)", tm.Add(1))
52	no("tm.AddDate(1, 1, 1)", tm.AddDate(1, 1, 1))
53	no("tm.AddDate(0, 0, 0)", tm.AddDate(0, 0, 0))
54	no("tm.In(UTC)", tm.In(UTC))
55	no("tm.Local()", tm.Local())
56	no("tm.UTC()", tm.UTC())
57	no("tm.Round(2)", tm.Round(2))
58	no("tm.Truncate(2)", tm.Truncate(2))
59}
60
61func TestMonotonicAdd(t *testing.T) {
62	tm := Unix(1486057371, 123456)
63	SetMono(&tm, 123456789012345)
64
65	t2 := tm.Add(1e8)
66	if t2.Nanosecond() != 100123456 {
67		t.Errorf("t2.Nanosecond() = %d, want 100123456", t2.Nanosecond())
68	}
69	if GetMono(&t2) != 123456889012345 {
70		t.Errorf("t2.mono = %d, want 123456889012345", GetMono(&t2))
71	}
72
73	t3 := tm.Add(-9e18) // wall now out of range
74	if t3.Nanosecond() != 123456 {
75		t.Errorf("t3.Nanosecond() = %d, want 123456", t3.Nanosecond())
76	}
77	if GetMono(&t3) != 0 {
78		t.Errorf("t3.mono = %d, want 0 (wall time out of range for monotonic reading)", GetMono(&t3))
79	}
80
81	t4 := tm.Add(+9e18) // wall now out of range
82	if t4.Nanosecond() != 123456 {
83		t.Errorf("t4.Nanosecond() = %d, want 123456", t4.Nanosecond())
84	}
85	if GetMono(&t4) != 0 {
86		t.Errorf("t4.mono = %d, want 0 (wall time out of range for monotonic reading)", GetMono(&t4))
87	}
88
89	tn := Now()
90	tn1 := tn.Add(1 * Hour)
91	Sleep(100 * Millisecond)
92	d := Until(tn1)
93	if d < 59*Minute {
94		t.Errorf("Until(Now().Add(1*Hour)) = %v, wanted at least 59m", d)
95	}
96	now := Now()
97	if now.After(tn1) {
98		t.Errorf("Now().After(Now().Add(1*Hour)) = true, want false")
99	}
100	if !tn1.After(now) {
101		t.Errorf("Now().Add(1*Hour).After(now) = false, want true")
102	}
103	if tn1.Before(now) {
104		t.Errorf("Now().Add(1*Hour).Before(Now()) = true, want false")
105	}
106	if !now.Before(tn1) {
107		t.Errorf("Now().Before(Now().Add(1*Hour)) = false, want true")
108	}
109}
110
111func TestMonotonicSub(t *testing.T) {
112	t1 := Unix(1483228799, 995e6)
113	SetMono(&t1, 123456789012345)
114
115	t2 := Unix(1483228799, 5e6)
116	SetMono(&t2, 123456789012345+10e6)
117
118	t3 := Unix(1483228799, 995e6)
119	SetMono(&t3, 123456789012345+1e9)
120
121	t1w := t1.AddDate(0, 0, 0)
122	if GetMono(&t1w) != 0 {
123		t.Fatalf("AddDate didn't strip monotonic clock reading")
124	}
125	t2w := t2.AddDate(0, 0, 0)
126	if GetMono(&t2w) != 0 {
127		t.Fatalf("AddDate didn't strip monotonic clock reading")
128	}
129	t3w := t3.AddDate(0, 0, 0)
130	if GetMono(&t3w) != 0 {
131		t.Fatalf("AddDate didn't strip monotonic clock reading")
132	}
133
134	sub := func(txs, tys string, tx, txw, ty, tyw Time, d, dw Duration) {
135		check := func(expr string, d, want Duration) {
136			if d != want {
137				t.Errorf("%s = %v, want %v", expr, d, want)
138			}
139		}
140		check(txs+".Sub("+tys+")", tx.Sub(ty), d)
141		check(txs+"w.Sub("+tys+")", txw.Sub(ty), dw)
142		check(txs+".Sub("+tys+"w)", tx.Sub(tyw), dw)
143		check(txs+"w.Sub("+tys+"w)", txw.Sub(tyw), dw)
144	}
145	sub("t1", "t1", t1, t1w, t1, t1w, 0, 0)
146	sub("t1", "t2", t1, t1w, t2, t2w, -10*Millisecond, 990*Millisecond)
147	sub("t1", "t3", t1, t1w, t3, t3w, -1000*Millisecond, 0)
148
149	sub("t2", "t1", t2, t2w, t1, t1w, 10*Millisecond, -990*Millisecond)
150	sub("t2", "t2", t2, t2w, t2, t2w, 0, 0)
151	sub("t2", "t3", t2, t2w, t3, t3w, -990*Millisecond, -990*Millisecond)
152
153	sub("t3", "t1", t3, t3w, t1, t1w, 1000*Millisecond, 0)
154	sub("t3", "t2", t3, t3w, t2, t2w, 990*Millisecond, 990*Millisecond)
155	sub("t3", "t3", t3, t3w, t3, t3w, 0, 0)
156
157	cmp := func(txs, tys string, tx, txw, ty, tyw Time, c, cw int) {
158		check := func(expr string, b, want bool) {
159			if b != want {
160				t.Errorf("%s = %v, want %v", expr, b, want)
161			}
162		}
163		check(txs+".After("+tys+")", tx.After(ty), c > 0)
164		check(txs+"w.After("+tys+")", txw.After(ty), cw > 0)
165		check(txs+".After("+tys+"w)", tx.After(tyw), cw > 0)
166		check(txs+"w.After("+tys+"w)", txw.After(tyw), cw > 0)
167
168		check(txs+".Before("+tys+")", tx.Before(ty), c < 0)
169		check(txs+"w.Before("+tys+")", txw.Before(ty), cw < 0)
170		check(txs+".Before("+tys+"w)", tx.Before(tyw), cw < 0)
171		check(txs+"w.Before("+tys+"w)", txw.Before(tyw), cw < 0)
172
173		check(txs+".Equal("+tys+")", tx.Equal(ty), c == 0)
174		check(txs+"w.Equal("+tys+")", txw.Equal(ty), cw == 0)
175		check(txs+".Equal("+tys+"w)", tx.Equal(tyw), cw == 0)
176		check(txs+"w.Equal("+tys+"w)", txw.Equal(tyw), cw == 0)
177	}
178
179	cmp("t1", "t1", t1, t1w, t1, t1w, 0, 0)
180	cmp("t1", "t2", t1, t1w, t2, t2w, -1, +1)
181	cmp("t1", "t3", t1, t1w, t3, t3w, -1, 0)
182
183	cmp("t2", "t1", t2, t2w, t1, t1w, +1, -1)
184	cmp("t2", "t2", t2, t2w, t2, t2w, 0, 0)
185	cmp("t2", "t3", t2, t2w, t3, t3w, -1, -1)
186
187	cmp("t3", "t1", t3, t3w, t1, t1w, +1, 0)
188	cmp("t3", "t2", t3, t3w, t2, t2w, +1, +1)
189	cmp("t3", "t3", t3, t3w, t3, t3w, 0, 0)
190}
191
192func TestMonotonicOverflow(t *testing.T) {
193	t1 := Now().Add(-30 * Second)
194	d := Until(t1)
195	if d < -35*Second || -30*Second < d {
196		t.Errorf("Until(Now().Add(-30s)) = %v, want roughly -30s (-35s to -30s)", d)
197	}
198
199	t1 = Now().Add(30 * Second)
200	d = Until(t1)
201	if d < 25*Second || 30*Second < d {
202		t.Errorf("Until(Now().Add(-30s)) = %v, want roughly 30s (25s to 30s)", d)
203	}
204
205	t0 := Now()
206	t1 = t0.Add(Duration(1<<63 - 1))
207	if GetMono(&t1) != 0 {
208		t.Errorf("Now().Add(maxDuration) has monotonic clock reading (%v => %v %d %d)", t0.String(), t1.String(), t0.Unix(), t1.Unix())
209	}
210	t2 := t1.Add(-Duration(1<<63 - 1))
211	d = Since(t2)
212	if d < -10*Second || 10*Second < d {
213		t.Errorf("Since(Now().Add(max).Add(-max)) = %v, want [-10s, 10s]", d)
214	}
215
216	t0 = Now()
217	t1 = t0.Add(1 * Hour)
218	Sleep(100 * Millisecond)
219	t2 = Now().Add(-5 * Second)
220	if !t1.After(t2) {
221		t.Errorf("Now().Add(1*Hour).After(Now().Add(-5*Second)) = false, want true\nt1=%v\nt2=%v", t1, t2)
222	}
223	if t2.After(t1) {
224		t.Errorf("Now().Add(-5*Second).After(Now().Add(1*Hour)) = true, want false\nt1=%v\nt2=%v", t1, t2)
225	}
226	if t1.Before(t2) {
227		t.Errorf("Now().Add(1*Hour).Before(Now().Add(-5*Second)) = true, want false\nt1=%v\nt2=%v", t1, t2)
228	}
229	if !t2.Before(t1) {
230		t.Errorf("Now().Add(-5*Second).Before(Now().Add(1*Hour)) = false, want true\nt1=%v\nt2=%v", t1, t2)
231	}
232}
233
234var monotonicStringTests = []struct {
235	mono int64
236	want string
237}{
238	{0, "m=+0.000000000"},
239	{123456789, "m=+0.123456789"},
240	{-123456789, "m=-0.123456789"},
241	{123456789000, "m=+123.456789000"},
242	{-123456789000, "m=-123.456789000"},
243	{9e18, "m=+9000000000.000000000"},
244	{-9e18, "m=-9000000000.000000000"},
245	{-1 << 63, "m=-9223372036.854775808"},
246}
247
248func TestMonotonicString(t *testing.T) {
249	t1 := Now()
250	t.Logf("Now() = %v", t1)
251
252	for _, tt := range monotonicStringTests {
253		t1 := Now()
254		SetMono(&t1, tt.mono)
255		s := t1.String()
256		got := s[strings.LastIndex(s, " ")+1:]
257		if got != tt.want {
258			t.Errorf("with mono=%d: got %q; want %q", tt.mono, got, tt.want)
259		}
260	}
261}
262