github.com/m3db/m3@v1.5.1-0.20231129193456-75a402aa583b/src/x/clock/offset_clock_test.go (about)

     1  // Copyright (c) 2021 Uber Technologies, Inc.
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     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
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     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,
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    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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    19  // THE SOFTWARE.
    20  
    21  package clock
    22  
    23  import (
    24  	"testing"
    25  	"time"
    26  
    27  	"github.com/stretchr/testify/assert"
    28  )
    29  
    30  func TestOffsetClockNow(t *testing.T) {
    31  	OneYearFromNow := time.Now().Add(365 * 24 * time.Hour).Truncate(time.Nanosecond)
    32  
    33  	initialSeedTime := time.Now()
    34  
    35  	advanceByOneSec := func() time.Time {
    36  		initialSeedTime = initialSeedTime.Add(1 * time.Second)
    37  		return initialSeedTime
    38  	}
    39  
    40  	tests := []struct {
    41  		name       string
    42  		offsetTime time.Time
    43  		expected   []time.Time
    44  	}{
    45  		{
    46  			name:       "past",
    47  			offsetTime: time.Unix(1614245284, 0),
    48  			expected: []time.Time{
    49  				time.Unix(1614245285, 0),
    50  				time.Unix(1614245286, 0),
    51  				time.Unix(1614245287, 0),
    52  			},
    53  		},
    54  		{
    55  			name:       "initial unix time",
    56  			offsetTime: time.Unix(0, 0),
    57  			expected: []time.Time{
    58  				time.Unix(1, 0),
    59  				time.Unix(2, 0),
    60  				time.Unix(3, 0),
    61  			},
    62  		},
    63  		{
    64  			name:       "future",
    65  			offsetTime: OneYearFromNow,
    66  			expected: []time.Time{
    67  				OneYearFromNow.Add(1 * time.Second),
    68  				OneYearFromNow.Add(2 * time.Second),
    69  				OneYearFromNow.Add(3 * time.Second),
    70  			},
    71  		},
    72  	}
    73  	for _, tt := range tests {
    74  		t.Run(tt.name, func(t *testing.T) {
    75  			sut := NewOffsetClock(tt.offsetTime, advanceByOneSec)
    76  			for _, expected := range tt.expected {
    77  				actual := sut.Now()
    78  				assert.Equal(t, expected.UnixNano(), actual.UnixNano())
    79  			}
    80  		})
    81  	}
    82  }
    83  
    84  func TestNewOffsetClockFromTimeDelta(t *testing.T) {
    85  	nowFn := func() time.Time {
    86  		return time.Date(2021, 1, 1, 0, 0, 0, 0, time.Local)
    87  	}
    88  
    89  	tests := []struct {
    90  		name      string
    91  		timeDelta time.Duration
    92  		expected  time.Time
    93  	}{
    94  		{
    95  			name:      "positive offset",
    96  			timeDelta: time.Hour,
    97  			expected:  time.Date(2021, 1, 1, 1, 0, 0, 0, time.Local),
    98  		},
    99  		{
   100  			name:      "negative offset",
   101  			timeDelta: -24 * time.Hour,
   102  			expected:  time.Date(2020, 12, 31, 0, 0, 0, 0, time.Local),
   103  		},
   104  	}
   105  
   106  	for _, tt := range tests {
   107  		t.Run(tt.name, func(t *testing.T) {
   108  			assert.Equal(t, tt.expected, NewOffsetClockFromTimeDelta(tt.timeDelta, nowFn).Now())
   109  		})
   110  	}
   111  }