}()
	mu.Lock(id, source)
	mu.RUnlock(t.Context())
}

// Borrowed from rwmutex_test.go
func benchmarkRWMutex(b *testing.B, localWork, writeRatio int) {
	b.ResetTimer()
	b.ReportAllocs()

	b.RunParallel(func(pb *testing.PB) {
		foo := 0
		for pb.Next() {
			rwm := NewDRWMutex(ds, "test")
			foo++
			if foo%writeRatio == 0 {
				rwm.Lock(id, source)
				rwm.Unlock(b.Context())

		{name: "long-fail", input: strings.Repeat("a/", 2000) + "../..", want: true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(b *testing.B) {
			b.SetBytes(int64(len(tt.input)))
			b.ReportAllocs()
			for b.Loop() {
				if got := hasBadPathComponent(tt.input); got != tt.want {
					t.Fatalf("hasBadPathComponent() = %v, want %v", got, tt.want)
				}
			}
		})
	}

			ok:   false,
		},
		{
			name: "LeadingError",
			in:   "1.abc123",
			want: time.Time{},
			ok:   false,
		},
	}
	for _, tt := range tests {
		b.Run(tt.name, func(b *testing.B) {
			b.ReportAllocs()
			for b.Loop() {
				ts, err := parsePAXTime(tt.in)
				if (err == nil) != tt.ok {
					if err != nil {
						b.Fatal(err)
					}
					b.Fatal("expected error")
				}
				if !ts.Equal(tt.want) {

		zw := NewWriter(buf)
		for j := 0; j < 3; j++ {
			w, _ := zw.CreateHeader(&FileHeader{
				Name:   "foo",
				Method: Deflate,
			})
			w.Write(bigBuf)
		}
		zw.Close()
	}

	b.ReportAllocs()
	// Run once and then reset the timer.
	// This effectively discards the very large initial flate setup cost,
	// as well as the initialization of bigBuf.
	runOnce(&bytes.Buffer{})
	b.ResetTimer()

	content := make([]byte, size)

	for i := range dataDown {
		disks[i] = OfflineDisk
	}
	for i := data; i < data+parityDown; i++ {
		disks[i] = OfflineDisk
	}

	b.SetBytes(size)
	b.ReportAllocs()
	for b.Loop() {
		writers := make([]io.Writer, len(disks))
		for i, disk := range disks {
			if disk == OfflineDisk {
				continue
			}

		b.Run(fmt.Sprintf("N%d", n), func(b *testing.B) {
			b.ReportAllocs()
			for i := 0; i < b.N; i++ {
				var bb Buffer
				for bb.Len() < n {
					bb.Write(block)
				}
			}
		})
	}
}

func BenchmarkBufferAppendNoCopy(b *testing.B) {
	var bb Buffer
	bb.Grow(16 << 20)
	b.SetBytes(int64(bb.Available()))
	b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		bb.Reset()

			[]byte("hello"),
		}},
	}}

	b.Run("Writer", func(b *testing.B) {
		for _, v := range vectors {
			b.Run(v.label, func(b *testing.B) {
				b.ReportAllocs()
				for i := 0; i < b.N; i++ {
					// Writing to io.Discard because we want to
					// test purely the writer code and not bring in disk performance into this.
					tw := NewWriter(io.Discard)

	r := strings.NewReader("       foo       foo        42        42        42        42        42        42        42        42       4.2       4.2       4.2       4.2\n")
	buf := NewReader(r)
	b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		r.Seek(0, io.SeekStart)
		buf.Reset(r)

		_, err := buf.ReadString('\n')
		if err != nil {
			b.Fatal(err)
		}
	}
}

	}

	for i := range dataDown {
		writers[i] = nil
	}
	for i := data; i < data+parityDown; i++ {
		writers[i] = nil
	}

	b.SetBytes(size)
	b.ReportAllocs()
	for b.Loop() {
		bitrotReaders := make([]io.ReaderAt, len(disks))
		for index, disk := range disks {
			if writers[index] == nil {
				continue
			}
			tillOffset := erasure.ShardFileOffset(0, size, size)

		desc := fmt.Sprintf("%q %q %q %d", tt.in, tt.old, tt.new, tt.n)
		var (
			in  = []byte(tt.in)
			old = []byte(tt.old)
			new = []byte(tt.new)
		)
		b.Run(desc, func(b *testing.B) {
			b.ReportAllocs()
			for b.Loop() {
				Replace(in, old, new, tt.n)
			}
		})
	}
}

type TitleTest struct {
	in, out string
}

var TitleTests = []TitleTest{
	{"", ""},