169 lines
3.4 KiB
Go
169 lines
3.4 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package binary
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import (
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"bytes"
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"io"
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"testing"
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)
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func testConstant(t *testing.T, w uint, max int) {
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buf := make([]byte, MaxVarintLen64)
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n := PutUvarint(buf, 1<<w-1)
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if n != max {
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t.Errorf("MaxVarintLen%d = %d; want %d", w, max, n)
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}
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}
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func TestConstants(t *testing.T) {
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testConstant(t, 16, MaxVarintLen16)
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testConstant(t, 32, MaxVarintLen32)
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testConstant(t, 64, MaxVarintLen64)
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}
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func testVarint(t *testing.T, x int64) {
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buf := make([]byte, MaxVarintLen64)
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n := PutVarint(buf, x)
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y, m := Varint(buf[0:n])
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if x != y {
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t.Errorf("Varint(%d): got %d", x, y)
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}
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if n != m {
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t.Errorf("Varint(%d): got n = %d; want %d", x, m, n)
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}
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y, err := ReadVarint(bytes.NewBuffer(buf))
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if err != nil {
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t.Errorf("ReadVarint(%d): %s", x, err)
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}
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if x != y {
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t.Errorf("ReadVarint(%d): got %d", x, y)
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}
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}
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func testUvarint(t *testing.T, x uint64) {
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buf := make([]byte, MaxVarintLen64)
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n := PutUvarint(buf, x)
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y, m := Uvarint(buf[0:n])
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if x != y {
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t.Errorf("Uvarint(%d): got %d", x, y)
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}
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if n != m {
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t.Errorf("Uvarint(%d): got n = %d; want %d", x, m, n)
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}
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y, err := ReadUvarint(bytes.NewBuffer(buf))
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if err != nil {
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t.Errorf("ReadUvarint(%d): %s", x, err)
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}
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if x != y {
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t.Errorf("ReadUvarint(%d): got %d", x, y)
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}
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}
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var tests = []int64{
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-1 << 63,
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-1<<63 + 1,
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-1,
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0,
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1,
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2,
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10,
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20,
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63,
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64,
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65,
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127,
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128,
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129,
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255,
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256,
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257,
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1<<63 - 1,
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}
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func TestVarint(t *testing.T) {
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for _, x := range tests {
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testVarint(t, x)
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testVarint(t, -x)
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}
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for x := int64(0x7); x != 0; x <<= 1 {
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testVarint(t, x)
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testVarint(t, -x)
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}
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}
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func TestUvarint(t *testing.T) {
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for _, x := range tests {
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testUvarint(t, uint64(x))
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}
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for x := uint64(0x7); x != 0; x <<= 1 {
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testUvarint(t, x)
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}
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}
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func TestBufferTooSmall(t *testing.T) {
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buf := []byte{0x80, 0x80, 0x80, 0x80}
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for i := 0; i <= len(buf); i++ {
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buf := buf[0:i]
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x, n := Uvarint(buf)
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if x != 0 || n != 0 {
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t.Errorf("Uvarint(%v): got x = %d, n = %d", buf, x, n)
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}
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x, err := ReadUvarint(bytes.NewBuffer(buf))
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if x != 0 || err != io.EOF {
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t.Errorf("ReadUvarint(%v): got x = %d, err = %s", buf, x, err)
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}
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}
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}
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func testOverflow(t *testing.T, buf []byte, n0 int, err0 error) {
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x, n := Uvarint(buf)
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if x != 0 || n != n0 {
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t.Errorf("Uvarint(%v): got x = %d, n = %d; want 0, %d", buf, x, n, n0)
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}
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x, err := ReadUvarint(bytes.NewBuffer(buf))
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if x != 0 || err != err0 {
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t.Errorf("ReadUvarint(%v): got x = %d, err = %s; want 0, %s", buf, x, err, err0)
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}
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}
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func TestOverflow(t *testing.T) {
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testOverflow(t, []byte{0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x2}, -10, overflow)
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testOverflow(t, []byte{0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x1, 0, 0}, -13, overflow)
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}
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func TestNonCanonicalZero(t *testing.T) {
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buf := []byte{0x80, 0x80, 0x80, 0}
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x, n := Uvarint(buf)
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if x != 0 || n != 4 {
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t.Errorf("Uvarint(%v): got x = %d, n = %d; want 0, 4", buf, x, n)
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}
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}
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func BenchmarkPutUvarint32(b *testing.B) {
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buf := make([]byte, MaxVarintLen32)
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b.SetBytes(4)
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for i := 0; i < b.N; i++ {
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for j := uint(0); j < MaxVarintLen32; j++ {
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PutUvarint(buf, 1<<(j*7))
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}
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}
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}
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func BenchmarkPutUvarint64(b *testing.B) {
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buf := make([]byte, MaxVarintLen64)
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b.SetBytes(8)
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for i := 0; i < b.N; i++ {
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for j := uint(0); j < MaxVarintLen64; j++ {
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PutUvarint(buf, 1<<(j*7))
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}
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}
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}
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