test_test.go

package main

import (
	"strings"
	"testing"
)

func BenchmarkFib10(b *testing.B) {
	// run the Fib function b.N times
	var c = "abcdefghijklmnopqrstuvwxyz"
	c = strings.Repeat(c, 100000000)
	a := []byte(c)

	for n := 0; n < b.N; n++ {
		for i := len(a)/2 - 1; i >= 0; i-- {
			opp := len(a) - 1 - i
			c := a[opp]
			a[opp] = a[i]
			a[i] = c
		}
	}
}

func BenchmarkFib11(b *testing.B) {
	// run the Fib function b.N times
	var c = "abcdefghijklmnopqrstuvwxyz"
	c = strings.Repeat(c, 100000000)
	a := []byte(c)

	for n := 0; n < b.N; n++ {
		for i := len(a)/2 - 1; i >= 0; i-- {
			opp := len(a) - 1 - i
			a[i], a[opp] = a[opp], a[i]
		}
	}
}

go test -run=1 -bench=.