package buffer import ( "bytes" "strings" "testing" "time" "github.com/stretchr/testify/assert" "github.com/pengsrc/go-shared/convert") func TestBufferWrites(t *testing.T) { buf := NewBytesPool().Get() tests := []struct { desc string f func() want string }{ {"AppendByte", func() { buf.AppendByte('v') }, "v"}, {"AppendBytes", func() { buf.AppendBytes([]byte{'a', 'b', 'c'}) }, "abc"}, {"AppendString", func() { buf.AppendString("foo") }, "foo"}, {"AppendIntPositive", func() { buf.AppendInt(42) }, "42"}, {"AppendIntNegative", func() { buf.AppendInt(-42) }, "-42"}, {"AppendUint", func() { buf.AppendUint(42) }, "42"}, {"AppendBool", func() { buf.AppendBool(true) }, "true"}, {"AppendFloat64", func() { buf.AppendFloat(3.14, 64) }, "3.14"}, // Intentionally introduce some floating-point error. {"AppendFloat32", func() { buf.AppendFloat(float64(float32(3.14)), 32) }, "3.14"}, {"AppendTime", func() { buf.AppendTime(time.Time{}, convert.ISO8601Milli) }, "0001-01-01T00:00:00.000Z"}, {"AppendWrite", func() { buf.Write([]byte("foo")) }, "foo"}, } for _, tt := range tests { t.Run(tt.desc, func(t *testing.T) { buf.Reset() tt.f() assert.Equal(t, tt.want, buf.String(), "Unexpected buffer.String().") assert.Equal(t, tt.want, string(buf.Bytes()), "Unexpected string(buffer.Bytes()).") assert.Equal(t, len(tt.want), buf.Len(), "Unexpected buffer length.") // We're not writing more than a kilobyte in tests. assert.Equal(t, defaultSize, buf.Cap(), "Expected buffer capacity to remain constant.") }) }} func BenchmarkBuffers(b *testing.B) { // Because we use the strconv.AppendFoo functions so liberally, we can't // use the standard library's bytes.Buffer anyways (without incurring a // bunch of extra allocations). Nevertheless, let's make sure that we're // not losing any precious nanoseconds. str := strings.Repeat("a", 1024) slice := make([]byte, 1024) buf := bytes.NewBuffer(slice) custom := NewBytesPool().Get() b.Run("ByteSlice", func(b *testing.B) { for i := 0; i < b.N; i++ { slice = append(slice, str...) slice = slice[:0] } }) b.Run("BytesBuffer", func(b *testing.B) { for i := 0; i < b.N; i++ { buf.WriteString(str) buf.Reset() } }) b.Run("CustomBuffer", func(b *testing.B) { for i := 0; i < b.N; i++ { custom.AppendString(str) custom.Reset() } })}
package buffer
import (
"bytes"
"strings"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/pengsrc/go-shared/convert"
)
func TestBufferWrites(t *testing.T) {
buf := NewBytesPool().Get()
tests := []struct {
desc string
f func()
want string
}{
{"AppendByte", func() { buf.AppendByte('v') }, "v"},
{"AppendBytes", func() { buf.AppendBytes([]byte{'a', 'b', 'c'}) }, "abc"},
{"AppendString", func() { buf.AppendString("foo") }, "foo"},
{"AppendIntPositive", func() { buf.AppendInt(42) }, "42"},
{"AppendIntNegative", func() { buf.AppendInt(-42) }, "-42"},
{"AppendUint", func() { buf.AppendUint(42) }, "42"},
{"AppendBool", func() { buf.AppendBool(true) }, "true"},
{"AppendFloat64", func() { buf.AppendFloat(3.14, 64) }, "3.14"},
// Intentionally introduce some floating-point error.
{"AppendFloat32", func() { buf.AppendFloat(float64(float32(3.14)), 32) }, "3.14"},
{"AppendTime", func() { buf.AppendTime(time.Time{}, convert.ISO8601Milli) }, "0001-01-01T00:00:00.000Z"},
{"AppendWrite", func() { buf.Write([]byte("foo")) }, "foo"},
}
for _, tt := range tests {
t.Run(tt.desc, func(t *testing.T) {
buf.Reset()
tt.f()
assert.Equal(t, tt.want, buf.String(), "Unexpected buffer.String().")
assert.Equal(t, tt.want, string(buf.Bytes()), "Unexpected string(buffer.Bytes()).")
assert.Equal(t, len(tt.want), buf.Len(), "Unexpected buffer length.")
// We're not writing more than a kilobyte in tests.
assert.Equal(t, defaultSize, buf.Cap(), "Expected buffer capacity to remain constant.")
})
}
}
func BenchmarkBuffers(b *testing.B) {
// Because we use the strconv.AppendFoo functions so liberally, we can't
// use the standard library's bytes.Buffer anyways (without incurring a
// bunch of extra allocations). Nevertheless, let's make sure that we're
// not losing any precious nanoseconds.
str := strings.Repeat("a", 1024)
slice := make([]byte, 1024)
buf := bytes.NewBuffer(slice)
custom := NewBytesPool().Get()
b.Run("ByteSlice", func(b *testing.B) {
for i := 0; i < b.N; i++ {
slice = append(slice, str...)
slice = slice[:0]
}
})
b.Run("BytesBuffer", func(b *testing.B) {
for i := 0; i < b.N; i++ {
buf.WriteString(str)
buf.Reset()
}
})
b.Run("CustomBuffer", func(b *testing.B) {
for i := 0; i < b.N; i++ {
custom.AppendString(str)
custom.Reset()
}
})
}