w.Flush()
		if s := buf.String(); s != "\uFFFD" {
			t.Errorf("WriteRune(%d) wrote %q, not replacement character", r, s)
		}
	}
}

func TestReadStringAllocs(t *testing.T) {
	if asan.Enabled {
		t.Skip("test allocates more with -asan; see #70079")
	}
	r := strings.NewReader("       foo       foo        42        42        42        42        42        42        42        42       4.2       4.2       4.2       4.2\n")

// Copyright 2009 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 bytes_test

import (
	. "bytes"
	"fmt"
	"internal/asan"
	"internal/testenv"
	"iter"
	"math"
	"math/rand"
	"slices"
	"strings"
	"testing"
	"unicode"
	"unicode/utf8"
	"unsafe"
)

func sliceOfString(s [][]byte) []string {