package errors

import (
	"errors"
	"testing"
)

func TestAppErrorBasics(t *testing.T) {
	root := errors.New("root")
	appErr := NewBadRequest("bad", root)

	if appErr.Code != 400 || appErr.Message != "bad" {
		t.Fatalf("unexpected appErr fields: %+v", appErr)
	}
	if got := appErr.Error(); got != "bad: root" {
		t.Fatalf("unexpected Error(): %s", got)
	}
	// 使用标准库 errors.Is/As（包级 Is/As 已移除）
	if !errors.Is(appErr, root) {
		t.Fatalf("Is should match wrapped error")
	}
	var target *AppError
	if !errors.As(appErr, &target) {
		t.Fatalf("As should succeed")
	}
}