1 // Copyright (c) 2021 Uber Technologies, Inc.
2 //
3 // Permission is hereby granted, free of charge, to any person obtaining a copy
4 // of this software and associated documentation files (the "Software"), to deal
5 // in the Software without restriction, including without limitation the rights
6 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 // copies of the Software, and to permit persons to whom the Software is
8 // furnished to do so, subject to the following conditions:
9 //
10 // The above copyright notice and this permission notice shall be included in
11 // all copies or substantial portions of the Software.
12 //
13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19 // THE SOFTWARE.
20 21 package atomic
22 23 import (
24 "testing"
25 "time"
26 27 "github.com/stretchr/testify/assert"
28 "github.com/stretchr/testify/require"
29 )
30 31 func TestTime(t *testing.T) {
32 start := time.Date(2021, 6, 17, 9, 10, 0, 0, time.UTC)
33 atom := NewTime(start)
34 35 require.Equal(t, start, atom.Load(), "Load didn't work")
36 require.Equal(t, time.Time{}, NewTime(time.Time{}).Load(), "Default time value is wrong")
37 }
38 39 func TestTimeLocation(t *testing.T) {
40 // Check TZ data hasn't been lost from load/store.
41 ny, err := time.LoadLocation("America/New_York")
42 require.NoError(t, err, "Failed to load location")
43 nyTime := NewTime(time.Date(2021, 1, 1, 0, 0, 0, 0, ny))
44 45 var atom Time
46 atom.Store(nyTime.Load())
47 48 assert.Equal(t, ny, atom.Load().Location(), "Location information is wrong")
49 }
50 51 func TestLargeTime(t *testing.T) {
52 // Check "large/small" time that are beyond int64 ns
53 // representation (< year 1678 or > year 2262) can be
54 // correctly load/store'd.
55 t.Parallel()
56 57 t.Run("future", func(t *testing.T) {
58 future := time.Date(2262, 12, 31, 0, 0, 0, 0, time.UTC)
59 atom := NewTime(future)
60 dayAfterFuture := atom.Load().AddDate(0, 1, 0)
61 62 atom.Store(dayAfterFuture)
63 assert.Equal(t, 2263, atom.Load().Year())
64 })
65 66 t.Run("past", func(t *testing.T) {
67 past := time.Date(1678, 1, 1, 0, 0, 0, 0, time.UTC)
68 atom := NewTime(past)
69 dayBeforePast := atom.Load().AddDate(0, -1, 0)
70 71 atom.Store(dayBeforePast)
72 assert.Equal(t, 1677, atom.Load().Year())
73 })
74 }
75 76 func TestMonotonic(t *testing.T) {
77 before := NewTime(time.Now())
78 time.Sleep(15 * time.Millisecond)
79 after := NewTime(time.Now())
80 81 // try loading/storing before and test monotonic clock value hasn't been lost
82 bt := before.Load()
83 before.Store(bt)
84 d := after.Load().Sub(before.Load())
85 assert.True(t, 15 <= d.Milliseconds())
86 }
87