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// 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"
"reflect"
"runtime/metrics"
"sort"
"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, os.Args[0], "-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.MustHaveGoBuild(t)
out, err := exec.Command("go", "run", "cmd/vendor/golang.org/x/tools/cmd/bisect", "GODEBUG=buggy=1#PATTERN", os.Args[0], "-test.run=BisectTestCase").CombinedOutput()
if err != nil {
t.Fatalf("exec bisect: %v\n%s", err, out)
}
var want []string
src, err := os.ReadFile("godebug_test.go")
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))
}
}
sort.Strings(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:"):])
}
}
sort.Strings(have)
if !reflect.DeepEqual(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=BisectTestCase
//
// 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")
}
}
}
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