micro/util/id/id_internal_test.go

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package id
import (
"testing"
"github.com/stretchr/testify/require"
)
func TestHasNoCollisions(t *testing.T) {
tries := 100_000
used := make(map[string]bool, tries)
for i := 0; i < tries; i++ {
id := Must()
require.False(t, used[id], "shouldn't return colliding IDs")
used[id] = true
}
}
func TestFlatDistribution(t *testing.T) {
tries := 100_000
alphabet := "abcdefghij"
size := 10
chars := make(map[rune]int)
for i := 0; i < tries; i++ {
id := Must(Alphabet(alphabet), Size(size))
for _, r := range id {
chars[r]++
}
}
for _, count := range chars {
require.InEpsilon(t, size*tries/len(alphabet), count, .01, "should have flat distribution")
}
}
// Benchmark id generator
func BenchmarkNanoid(b *testing.B) {
for n := 0; n < b.N; n++ {
_, _ = New()
}
}