buf = NewReaderSize(dataAndEOFReader("abcd"), 32)
	if s, err := buf.Peek(2); string(s) != "ab" || err != nil {
		t.Errorf(`Peek(2) on "abcd", EOF = %q, %v; want "ab", nil`, string(s), err)
	}
	if s, err := buf.Peek(4); string(s) != "abcd" || err != nil {
		t.Errorf(`Peek(4) on "abcd", EOF = %q, %v; want "abcd", nil`, string(s), err)
	}
	if n, err := buf.Read(p[0:5]); string(p[0:n]) != "abcd" || err != nil {

# Usage

```go
package main

import (
	"fmt"

	"github.com/smallnest/ringbuffer"
)

func main() {
	rb := ringbuffer.New(1024)

	// write
	rb.Write([]byte("abcd"))
	fmt.Println(rb.Length())
	fmt.Println(rb.Free())

	// read
	buf := make([]byte, 4)
	rb.Read(buf)
	fmt.Println(string(buf))
}
```

    assertThat(response1.body.string()).isEqualTo("abcd")
    val response2 = get(server.url("/"))
    assertThat(response2.header("Alpha")).isEqualTo("α")
    assertThat(response2.header("β")).isEqualTo("Beta")
    assertThat(response2.header("Gamma")).isEqualTo("Γ")
    assertThat(response2.header("Δ")).isEqualTo("Delta")
    assertThat(response2.body.string()).isEqualTo("abcd")
  }

  @Test

foo:////://///  s:foo p:////://///
c:/foo  s:c p:/foo
//foo/bar  s:http h:foo p:/bar
http://foo/path;a??e#f#g  s:http h:foo p:/path;a q:??e f:#f#g
http://foo/abcd?efgh?ijkl  s:http h:foo p:/abcd q:?efgh?ijkl
http://foo/abcd#foo?bar  s:http h:foo p:/abcd f:#foo?bar
[61:24:74]:98  s:http h:example.org p:/foo/[61:24:74]:98
http:[61:27]/:foo  s:http h:example.org p:/foo/[61:27]/:foo
http://[1::2]:3:4
http://2001::1
http://2001::1]

          body = transferKind.newRequestBody("ABCD"),
        ),
      )
    assertThat(readAscii(response.body.byteStream(), Int.MAX_VALUE))
      .isEqualTo("Page 2")
    val page1 = server.takeRequest()
    assertThat(page1.requestLine).isEqualTo("POST /page1 HTTP/1.1")
    assertThat(page1.body.readUtf8()).isEqualTo("ABCD")
    val page2 = server.takeRequest()

		},
		{
			name: "Empty",
			args: args{ports: []string{}},
			want: []string{},
		},
		{
			name: "Non-parseable",
			args: args{ports: []string{"abcd", "2345", "abcd"}},
			want: []string{"abcd", "2345"},
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := dedupPorts(tt.args.ports); !reflect.DeepEqual(got, tt.want) {

	a, b []byte
	i    int
}{
	{[]byte(""), []byte(""), 0},
	{[]byte("a"), []byte(""), 1},
	{[]byte(""), []byte("a"), -1},
	{[]byte("abc"), []byte("abc"), 0},
	{[]byte("abd"), []byte("abc"), 1},
	{[]byte("abc"), []byte("abd"), -1},
	{[]byte("ab"), []byte("abc"), -1},
	{[]byte("abc"), []byte("ab"), 1},
	{[]byte("x"), []byte("ab"), 1},
	{[]byte("ab"), []byte("x"), -1},
	{[]byte("x"), []byte("a"), 1},

			testRemaining{0, 0},
		},
	}, {
		maker: makeSparse{makeReg{4, "abcd"}, sparseHoles{{2, 3}}, 8},
		tests: []testFnc{
			testReadFrom{fileOps{"ab", int64(3), "cd"}, 7, io.ErrUnexpectedEOF},
			testRemaining{1, 0},
		},
	}, {
		maker: makeSparse{makeReg{4, "abcd"}, sparseHoles{{2, 3}}, 8},
		tests: []testFnc{
			testReadFrom{fileOps{"ab", int64(3), "cde"}, 7, errMissData},

		ok, msg := cmpReaders(r1, r2)
		if !(ok && msg == "") {
			t.Fatalf("unexpected")
		}
	}

	{
		r1 := bytes.NewReader([]byte("abc"))
		r2 := bytes.NewReader([]byte("abcd"))
		ok, _ := cmpReaders(r1, r2)
		if ok {
			t.Fatalf("unexpected")
		}
	}

  }

  @Test
  fun hostnameLowercaseCharactersMappedDirectly() {
    assertThat(parse("http://abcd").host).isEqualTo("abcd")
    assertThat(parse("http://σ").host).isEqualTo("xn--4xa")
  }

  @Test
  fun hostnameUppercaseCharactersConvertedToLowercase() {
    assertThat(parse("http://ABCD").host).isEqualTo("abcd")
    assertThat(parse("http://Σ").host).isEqualTo("xn--4xa")
  }

  @Test