caseloweringtrick_test.go

package main

import (
    "bytes"
    "strings"
    "testing"
)

var (
    shortLowercase = []byte(strings.Repeat("a", 20))
    longLowercase  = []byte(strings.Repeat("a", 150))
    shortMixed     = []byte(strings.Repeat("aA", 10))
    longMixed      = []byte(strings.Repeat("aA", 75))
    shortUppercase = []byte(strings.Repeat("A", 20))
    longUppercase  = []byte(strings.Repeat("A", 150))
)

func ToLowercase(text []byte) []byte {
    lowered := make([]byte, len(text))

    for i, char := range text {
        lowered[i] = char | 0x20
    }

    return lowered
}

func BenchmarkSTDShortLowercase(b *testing.B) {
    for i := 0; i < b.N; i++ {
        bytes.ToLower(shortLowercase)
    }
}

func BenchmarkSTDLongLowercase(b *testing.B) {
    for i := 0; i < b.N; i++ {
        bytes.ToLower(longLowercase)
    }
}

func BenchmarkSTDShortMixed(b *testing.B) {
    for i := 0; i < b.N; i++ {
        bytes.ToLower(shortMixed)
    }
}

func BenchmarkSTDLongMixed(b *testing.B) {
    for i := 0; i < b.N; i++ {
        bytes.ToLower(longMixed)
    }
}

func BenchmarkSTDShortUppercase(b *testing.B) {
    for i := 0; i < b.N; i++ {
        bytes.ToLower(shortUppercase)
    }
}

func BenchmarkSTDLongUppercase(b *testing.B) {
    for i := 0; i < b.N; i++ {
        bytes.ToLower(longUppercase)
    }
}

func BenchmarkOwnShortLowercase(b *testing.B) {
    for i := 0; i < b.N; i++ {
        ToLowercase(shortLowercase)
    }
}

func BenchmarkOwnLongLowercase(b *testing.B) {
    for i := 0; i < b.N; i++ {
        ToLowercase(longLowercase)
    }
}

func BenchmarkOwnShortMixed(b *testing.B) {
    for i := 0; i < b.N; i++ {
        ToLowercase(shortMixed)
    }
}

func BenchmarkOwnLongMixed(b *testing.B) {
    for i := 0; i < b.N; i++ {
        ToLowercase(longMixed)
    }
}

func BenchmarkOwnShortUppercase(b *testing.B) {
    for i := 0; i < b.N; i++ {
        ToLowercase(shortUppercase)
    }
}

func BenchmarkOwnLongUppercase(b *testing.B) {
    for i := 0; i < b.N; i++ {
        ToLowercase(longUppercase)
    }
}