fix the hot-reloading example

config_linux_test.go

@@ -22,17 +22,28 @@ import (
 )
 
 func ExampleConfig_SetHotReload() {
+	filename := "test_set_hot_reload.ini"
+
 	// The flag and cli parser will ignore the hot-reloading automatically.
-	conf := NewDefault(nil).AddParser(NewEnvVarParser(10, ""))
+	conf := NewDefault(nil)
 	conf.SetHotReload(conf.Parsers()...)
 	conf.RegisterOpt(Str("reload_opt", "abc", "test reload"))
-	conf.Parse([]string{}...) // We disables the cli arguments only for test.
+	conf.Parse("--config-file", filename)
 
 	time.Sleep(time.Millisecond * 10)
 	fmt.Println(conf.String("reload_opt"))
 
-	// Only for test
-	os.Setenv("RELOAD_OPT", "xyz")
+	// Only for test: Write the test config data into the file.
+	file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 0755)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	file.WriteString("[DEFAULT]\nreload_opt=xyz")
+	file.Close()
+	defer os.Remove(filename)
+
+	// Send the signal SIGHUP.
 	cmd := exec.Command("kill", "-HUP", fmt.Sprintf("%d", os.Getpid()))
 	if err := cmd.Run(); err != nil {
 		fmt.Println(err)