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// Copyright 2020 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.
//go:build unix && !ios && !android
package time_test
import (
"os"
"testing"
"time"
)
func TestEnvTZUsage(t *testing.T) {
const env = "TZ"
tz, ok := os.LookupEnv(env)
if !ok {
defer os.Unsetenv(env)
} else {
defer os.Setenv(env, tz)
}
defer time.ForceUSPacificForTesting()
localZoneName := "Local"
// The file may not exist.
if _, err := os.Stat("/etc/localtime"); os.IsNotExist(err) {
localZoneName = "UTC"
}
cases := []struct {
nilFlag bool
tz string
local string
}{
// no $TZ means use the system default /etc/localtime.
{true, "", localZoneName},
// $TZ="" means use UTC.
{false, "", "UTC"},
{false, ":", "UTC"},
{false, "Asia/Shanghai", "Asia/Shanghai"},
{false, ":Asia/Shanghai", "Asia/Shanghai"},
{false, "/etc/localtime", localZoneName},
{false, ":/etc/localtime", localZoneName},
}
for _, c := range cases {
time.ResetLocalOnceForTest()
if c.nilFlag {
os.Unsetenv(env)
} else {
os.Setenv(env, c.tz)
}
if time.Local.String() != c.local {
t.Errorf("invalid Local location name for %q: got %q want %q", c.tz, time.Local, c.local)
}
}
time.ResetLocalOnceForTest()
// The file may not exist on Solaris 2 and IRIX 6.
path := "/usr/share/zoneinfo/Asia/Shanghai"
os.Setenv(env, path)
if _, err := os.Stat(path); os.IsNotExist(err) {
if time.Local.String() != "UTC" {
t.Errorf(`invalid path should fallback to UTC: got %q want "UTC"`, time.Local)
}
return
}
if time.Local.String() != path {
t.Errorf(`custom path should lead to path itself: got %q want %q`, time.Local, path)
}
timeInUTC := time.Date(2009, 1, 1, 12, 0, 0, 0, time.UTC)
sameTimeInShanghai := time.Date(2009, 1, 1, 20, 0, 0, 0, time.Local)
if !timeInUTC.Equal(sameTimeInShanghai) {
t.Errorf("invalid timezone: got %q want %q", timeInUTC, sameTimeInShanghai)
}
time.ResetLocalOnceForTest()
os.Setenv(env, ":"+path)
if time.Local.String() != path {
t.Errorf(`custom path should lead to path itself: got %q want %q`, time.Local, path)
}
time.ResetLocalOnceForTest()
os.Setenv(env, path[:len(path)-1])
if time.Local.String() != "UTC" {
t.Errorf(`invalid path should fallback to UTC: got %q want "UTC"`, time.Local)
}
}