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Source file src/time/mono_test.go

Documentation: time

     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  
     5  package time_test
     6  
     7  import (
     8  	"strings"
     9  	"testing"
    10  	. "time"
    11  )
    12  
    13  func 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  
    61  func 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  
   111  func 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  
   192  func 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  
   234  var 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  
   248  func 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  

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