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Editing: tzdata_test.go

// 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.

package time_test

import (
	"reflect"
	"testing"
	"time"
	_ "time/tzdata"
)

var zones = []string{
	"Asia/Jerusalem",
	"America/Los_Angeles",
}

func TestEmbeddedTZData(t *testing.T) {
	undo := time.DisablePlatformSources()
	defer undo()

for _, zone := range zones {
		ref, err := time.LoadLocation(zone)
		if err != nil {
			t.Errorf("LoadLocation(%q): %v", zone, err)
			continue
		}

embedded, err := time.LoadFromEmbeddedTZData(zone)
		if err != nil {
			t.Errorf("LoadFromEmbeddedTZData(%q): %v", zone, err)
			continue
		}
		sample, err := time.LoadLocationFromTZData(zone, []byte(embedded))
		if err != nil {
			t.Errorf("LoadLocationFromTZData failed for %q: %v", zone, err)
			continue
		}

// Compare the name and zone fields of ref and sample.
		// The tx field changes faster as tzdata is updated.
		// The cache fields are expected to differ.
		v1 := reflect.ValueOf(ref).Elem()
		v2 := reflect.ValueOf(sample).Elem()
		typ := v1.Type()
		nf := typ.NumField()
		found := 0
		for i := 0; i < nf; i++ {
			ft := typ.Field(i)
			if ft.Name != "name" && ft.Name != "zone" {
				continue
			}
			found++
			if !equal(t, v1.Field(i), v2.Field(i)) {
				t.Errorf("zone %s: system and embedded tzdata field %s differs", zone, ft.Name)
			}
		}
		if found != 2 {
			t.Errorf("test must be updated for change to time.Location struct")
		}
	}
}

// equal is a small version of reflect.DeepEqual that we use to
// compare the values of zoneinfo unexported fields.
func equal(t *testing.T, f1, f2 reflect.Value) bool {
	switch f1.Type().Kind() {
	case reflect.Slice:
		if f1.Len() != f2.Len() {
			return false
		}
		for i := 0; i < f1.Len(); i++ {
			if !equal(t, f1.Index(i), f2.Index(i)) {
				return false
			}
		}
		return true
	case reflect.Struct:
		nf := f1.Type().NumField()
		for i := 0; i < nf; i++ {
			if !equal(t, f1.Field(i), f2.Field(i)) {
				return false
			}
		}
		return true
	case reflect.String:
		return f1.String() == f2.String()
	case reflect.Bool:
		return f1.Bool() == f2.Bool()
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		return f1.Int() == f2.Int()
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		return f1.Uint() == f2.Uint()
	default:
		t.Errorf("test internal error: unsupported kind %v", f1.Type().Kind())
		return true
	}
}

BATAL