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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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