package random import (	"math/rand"	"testing" 	"github.com/stretchr/testify/assert"	"github.com/stretchr/testify/require") func TestStringLength(t *testing.T) {	for i := 0; i < 100; i++ {		s := String(i)		assert.Equal(t, i, len(s))	}} func TestStringDuplicates(t *testing.T) {	seen := map[string]bool{}	for i := 0; i < 100; i++ {		s := String(8)		assert.False(t, seen[s])		assert.Equal(t, 8, len(s))		seen[s] = true	}} func TestPasswordLength(t *testing.T) {	for i := 0; i <= 128; i++ {		s, err := Password(i)		require.NoError(t, err)		// expected length is number of bytes rounded up		expected := i / 8		if i%8 != 0 {			expected++		}		// then converted to base 64		expected = (expected*8 + 5) / 6		assert.Equal(t, expected, len(s), i)	}} func TestPasswordDuplicates(t *testing.T) {	seen := map[string]bool{}	for i := 0; i < 100; i++ {		s, err := Password(64)		require.NoError(t, err)		assert.False(t, seen[s])		seen[s] = true	}} func TestSeed(t *testing.T) {	// seed 100 times and check the first random number doesn't repeat	// This test could fail with a probability of ~ 10**-15	const n = 100	var seen = map[int64]bool{}	for i := 0; i < n; i++ {		assert.NoError(t, Seed())		first := rand.Int63()		assert.False(t, seen[first])		seen[first] = true	}}