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// 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 iotest_test import ( "errors" "fmt" "testing/iotest" ) func ExampleErrReader() { // A reader that always returns a custom error. r := iotest.ErrReader(errors.New("custom error")) n, err := r.Read(nil) fmt.Printf("n: %d\nerr: %q\n", n, err) // Output: // n: 0 // err: "custom error" }
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