// Copyright 2011 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 errors_test import (	"errors"	"fmt"	"testing") func TestNewEqual(t *testing.T) {	// Different allocations should not be equal.	if errors.New("abc") == errors.New("abc") {		t.Errorf(`New("abc") == New("abc")`)	}	if errors.New("abc") == errors.New("xyz") {		t.Errorf(`New("abc") == New("xyz")`)	} 	// Same allocation should be equal to itself (not crash).	err := errors.New("jkl")	if err != err {		t.Errorf(`err != err`)	}} func TestErrorMethod(t *testing.T) {	err := errors.New("abc")	if err.Error() != "abc" {		t.Errorf(`New("abc").Error() = %q, want %q`, err.Error(), "abc")	}} func ExampleNew() {	err := errors.New("emit macho dwarf: elf header corrupted")	if err != nil {		fmt.Print(err)	}	// Output: emit macho dwarf: elf header corrupted} // The fmt package's Errorf function lets us use the package's formatting// features to create descriptive error messages.func ExampleNew_errorf() {	const name, id = "bimmler", 17	err := fmt.Errorf("user %q (id %d) not found", name, id)	if err != nil {		fmt.Print(err)	}	// Output: user "bimmler" (id 17) not found}