75 lines
1.2 KiB
Go
75 lines
1.2 KiB
Go
package rand
|
|
|
|
import (
|
|
"fmt"
|
|
mrand "math/rand"
|
|
"testing"
|
|
)
|
|
|
|
func TestCryptoUint64(t *testing.T) {
|
|
n1, err := CryptoUint64()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
n2, err := CryptoUint64()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
// This has such a low chance of occurring that it's likely to be
|
|
// indicative of a bad CSPRNG.
|
|
if n1 == n2 {
|
|
t.Fatalf("repeated random uint64s: %d", n1)
|
|
}
|
|
}
|
|
|
|
func TestIntn(t *testing.T) {
|
|
expected := []int{3081, 4887, 4847, 1059, 3081}
|
|
mrand.Seed(1)
|
|
for i := 0; i < 5; i++ {
|
|
n := Intn2(1000, 5000)
|
|
|
|
if n != expected[i] {
|
|
fmt.Printf("invalid sequence at %d: expected %d, have %d", i, expected[i], n)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestSeed(t *testing.T) {
|
|
seed1, err := Seed()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
var seed2 uint64
|
|
n1 := Int()
|
|
tries := 0
|
|
|
|
for {
|
|
seed2, err = Seed()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
if seed1 != seed2 {
|
|
break
|
|
}
|
|
|
|
tries++
|
|
|
|
if tries > 3 {
|
|
t.Fatal("can't generate two unique seeds")
|
|
}
|
|
}
|
|
|
|
n2 := Int()
|
|
|
|
// Again, this not impossible, merely statistically improbably and a
|
|
// potential canary for RNG issues.
|
|
if n1 == n2 {
|
|
t.Fatalf("repeated integers fresh from two unique seeds: %d/%d -> %d",
|
|
seed1, seed2, n1)
|
|
}
|
|
}
|