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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package buffer
import (
"bytes"
"strings"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func TestBufferWrites(t *testing.T) {
buf := NewPool().Get()
tests := []struct {
desc string
f func()
want string
}{
{"AppendByte", func() { buf.AppendByte('v') }, "v"},
{"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"},
{"AppendWrite", func() { buf.Write([]byte("foo")) }, "foo"},
{"AppendTime", func() { buf.AppendTime(time.Date(2000, 1, 2, 3, 4, 5, 6, time.UTC), time.RFC3339) }, "2000-01-02T03:04:05Z"},
{"WriteByte", func() { buf.WriteByte('v') }, "v"},
{"WriteString", func() { buf.WriteString("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 kibibyte in tests.
assert.Equal(t, _size, 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 := NewPool().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()
}
})
}
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