time_test.go

Documentation: go.uber.org/atomic

     1  // Copyright (c) 2021 Uber Technologies, Inc.
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    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
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