File size: 4,814 Bytes
e36aeda | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | // Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package godebug_test
import (
"fmt"
. "internal/godebug"
"internal/race"
"internal/testenv"
"os"
"os/exec"
"runtime/metrics"
"slices"
"strings"
"testing"
)
func TestGet(t *testing.T) {
foo := New("#foo")
tests := []struct {
godebug string
setting *Setting
want string
}{
{"", New("#"), ""},
{"", foo, ""},
{"foo=bar", foo, "bar"},
{"foo=bar,after=x", foo, "bar"},
{"before=x,foo=bar,after=x", foo, "bar"},
{"before=x,foo=bar", foo, "bar"},
{",,,foo=bar,,,", foo, "bar"},
{"foodecoy=wrong,foo=bar", foo, "bar"},
{"foo=", foo, ""},
{"foo", foo, ""},
{",foo", foo, ""},
{"foo=bar,baz", New("#loooooooong"), ""},
}
for _, tt := range tests {
t.Setenv("GODEBUG", tt.godebug)
got := tt.setting.Value()
if got != tt.want {
t.Errorf("get(%q, %q) = %q; want %q", tt.godebug, tt.setting.Name(), got, tt.want)
}
}
}
func TestMetrics(t *testing.T) {
const name = "http2client" // must be a real name so runtime will accept it
var m [1]metrics.Sample
m[0].Name = "/godebug/non-default-behavior/" + name + ":events"
metrics.Read(m[:])
if kind := m[0].Value.Kind(); kind != metrics.KindUint64 {
t.Fatalf("NonDefault kind = %v, want uint64", kind)
}
s := New(name)
s.Value()
s.IncNonDefault()
s.IncNonDefault()
s.IncNonDefault()
metrics.Read(m[:])
if kind := m[0].Value.Kind(); kind != metrics.KindUint64 {
t.Fatalf("NonDefault kind = %v, want uint64", kind)
}
if count := m[0].Value.Uint64(); count != 3 {
t.Fatalf("NonDefault value = %d, want 3", count)
}
}
// TestPanicNilRace checks for a race in the runtime caused by use of runtime
// atomics (not visible to usual race detection) to install the counter for
// non-default panic(nil) semantics. For #64649.
func TestPanicNilRace(t *testing.T) {
if !race.Enabled {
t.Skip("Skipping test intended for use with -race.")
}
if os.Getenv("GODEBUG") != "panicnil=1" {
cmd := testenv.CleanCmdEnv(testenv.Command(t, testenv.Executable(t), "-test.run=^TestPanicNilRace$", "-test.v", "-test.parallel=2", "-test.count=1"))
cmd.Env = append(cmd.Env, "GODEBUG=panicnil=1")
out, err := cmd.CombinedOutput()
t.Logf("output:\n%s", out)
if err != nil {
t.Errorf("Was not expecting a crash")
}
return
}
test := func(t *testing.T) {
t.Parallel()
defer func() {
recover()
}()
panic(nil)
}
t.Run("One", test)
t.Run("Two", test)
}
func TestCmdBisect(t *testing.T) {
testenv.MustHaveGoRun(t)
out, err := exec.Command(testenv.GoToolPath(t), "run", "cmd/vendor/golang.org/x/tools/cmd/bisect", "GODEBUG=buggy=1#PATTERN", os.Args[0], "-test.run=^TestBisectTestCase$").CombinedOutput()
if err != nil {
t.Fatalf("exec bisect: %v\n%s", err, out)
}
var want []string
src, err := os.ReadFile("godebug_test.go")
if err != nil {
t.Fatal(err)
}
for i, line := range strings.Split(string(src), "\n") {
if strings.Contains(line, "BISECT"+" "+"BUG") {
want = append(want, fmt.Sprintf("godebug_test.go:%d", i+1))
}
}
slices.Sort(want)
var have []string
for _, line := range strings.Split(string(out), "\n") {
if strings.Contains(line, "godebug_test.go:") {
have = append(have, line[strings.LastIndex(line, "godebug_test.go:"):])
}
}
slices.Sort(have)
if !slices.Equal(have, want) {
t.Errorf("bad bisect output:\nhave %v\nwant %v\ncomplete output:\n%s", have, want, string(out))
}
}
// This test does nothing by itself, but you can run
//
// bisect 'GODEBUG=buggy=1#PATTERN' go test -run='^TestBisectTestCase$'
//
// to see that the GODEBUG bisect support is working.
// TestCmdBisect above does exactly that.
func TestBisectTestCase(t *testing.T) {
s := New("#buggy")
for i := 0; i < 10; i++ {
a := s.Value() == "1"
b := s.Value() == "1"
c := s.Value() == "1" // BISECT BUG
d := s.Value() == "1" // BISECT BUG
e := s.Value() == "1" // BISECT BUG
if a {
t.Log("ok")
}
if b {
t.Log("ok")
}
if c {
t.Error("bug")
}
if d &&
e {
t.Error("bug")
}
}
}
func TestImmutable(t *testing.T) {
defer func(godebug string) {
os.Setenv("GODEBUG", godebug)
}(os.Getenv("GODEBUG"))
setting := New("fips140")
value := setting.Value()
os.Setenv("GODEBUG", "fips140=off")
if setting.Value() != value {
t.Errorf("Value() changed after setting GODEBUG=fips140=off")
}
os.Setenv("GODEBUG", "fips140=on")
if setting.Value() != value {
t.Errorf("Value() changed after setting GODEBUG=fips140=on")
}
os.Setenv("GODEBUG", "fips140=")
if setting.Value() != value {
t.Errorf("Value() changed after setting GODEBUG=fips140=")
}
os.Setenv("GODEBUG", "")
if setting.Value() != value {
t.Errorf("Value() changed after setting GODEBUG=")
}
}
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