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