codekingpro/portable-devtools

1// Copyright 2020 The Go Authors. All rights reserved.2// Use of this source code is governed by a BSD-style3// license that can be found in the LICENSE file.4 5package iotest_test6 7import (8	"errors"9	"fmt"10	"testing/iotest"11)12 13func ExampleErrReader() {14	// A reader that always returns a custom error.15	r := iotest.ErrReader(errors.New("custom error"))16	n, err := r.Read(nil)17	fmt.Printf("n:   %d\nerr: %q\n", n, err)18 19	// Output:20	// n:   021	// err: "custom error"22}23