random_test.go

package main

import (
	"fmt"
	"testing"
)

func TestRandom(t *testing.T) {
	n := 10000
	res := make([]int, 10)
	for i := 0; i < n; i++ {
		res[Random(0, len(res)-1)]++
	}

	for i, v := range res {
		fmt.Printf("%d %.1f%%\n", i, float64(v)/float64(n)*100)
	}

}

func TestMapIterationOrder(t *testing.T) {
	n := 10000
	res := make([]int, 10)
	m := map[int]struct{}{
		0: struct{}{},
		1: struct{}{},
		2: struct{}{},
		3: struct{}{},
		4: struct{}{},
		5: struct{}{},
		6: struct{}{},
		7: struct{}{},
		8: struct{}{},
		9: struct{}{},
	}
	for i := 0; i < n; i++ {
		for k := range m {
			res[k]++
			break
		}
	}

	for i, v := range res {
		fmt.Printf("%d %.1f%%\n", i, float64(v)/float64(n)*100)
	}

}

func TestRandomMapIterationOrder(t *testing.T) {
	n := 10000
	res := make([]int, 10)
	m := map[int]struct{}{
		0: struct{}{},
		1: struct{}{},
		2: struct{}{},
		3: struct{}{},
		4: struct{}{},
		5: struct{}{},
		6: struct{}{},
		7: struct{}{},
		8: struct{}{},
		9: struct{}{},
	}
	for i := 0; i < n; i++ {
		j := Random(0, len(m)-1)
		for k := range m {
			if j == 0 {
				res[k]++
				break
			}
			j--
		}
	}

	for i, v := range res {
		fmt.Printf("%d %.1f%%\n", i, float64(v)/float64(n)*100)
	}

}