| 1 | import rand |
| 2 | |
| 3 | fn test_rand_bytes() { |
| 4 | mut randoms := []string{} |
| 5 | for i in 0 .. 100 { |
| 6 | x := rand.bytes(i)!.hex() |
| 7 | if x.len > 0 { |
| 8 | randoms << x |
| 9 | } |
| 10 | assert x.len == i * 2 |
| 11 | } |
| 12 | mut differences := 0 |
| 13 | for idx in 1 .. randoms.len { |
| 14 | start := randoms[idx]#[0..8] |
| 15 | prev_start := randoms[idx - 1]#[0..8] |
| 16 | if start != prev_start { |
| 17 | differences++ |
| 18 | } |
| 19 | } |
| 20 | assert differences > 95 // normally around 98 |
| 21 | dump(differences) |
| 22 | } |
| 23 | |
| 24 | fn test_prng_rand_bytes() { |
| 25 | mut randoms := []string{} |
| 26 | mut rng := rand.get_current_rng() |
| 27 | for i in 0 .. 100 { |
| 28 | x := rng.bytes(i)!.hex() |
| 29 | if x.len > 0 { |
| 30 | randoms << x |
| 31 | } |
| 32 | assert x.len == i * 2 |
| 33 | } |
| 34 | mut differences := 0 |
| 35 | for idx in 1 .. randoms.len { |
| 36 | start := randoms[idx]#[0..8] |
| 37 | prev_start := randoms[idx - 1]#[0..8] |
| 38 | if start != prev_start { |
| 39 | differences++ |
| 40 | } |
| 41 | } |
| 42 | assert differences > 95 // normally around 98 |
| 43 | dump(differences) |
| 44 | } |
| 45 | |
| 46 | fn test_rand_read() { |
| 47 | max := 50 |
| 48 | mut a := []u8{len: max} |
| 49 | mut differences := 0 |
| 50 | for j in 1 .. max { |
| 51 | start := '00'.repeat(j) |
| 52 | for k in j + 1 .. max { |
| 53 | end := '00'.repeat(max - k) |
| 54 | middle := '00'.repeat(k - j) |
| 55 | // eprintln('> j: ${j} | k: ${k} | start: ${start} | middle: ${middle} | end: ${end}') |
| 56 | for i in 0 .. max { |
| 57 | a[i] = 0 |
| 58 | } |
| 59 | assert a[j..k].hex() == middle |
| 60 | for i in 0 .. 10 { |
| 61 | rand.read(mut a[j..k]) |
| 62 | // dump(a.hex()) |
| 63 | assert a[0..j].hex() == start |
| 64 | assert a[k..].hex() == end |
| 65 | if a[j..k].hex() != middle { |
| 66 | differences++ |
| 67 | } |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | dump(differences) |
| 72 | assert differences > 11700 // normally around 11758 |
| 73 | } |
| 74 | |
| 75 | fn test_prng_rand_read() { |
| 76 | max := 50 |
| 77 | mut a := []u8{len: max} |
| 78 | mut differences := 0 |
| 79 | mut rng := rand.get_current_rng() |
| 80 | for j in 1 .. max { |
| 81 | start := '00'.repeat(j) |
| 82 | for k in j + 1 .. max { |
| 83 | end := '00'.repeat(max - k) |
| 84 | middle := '00'.repeat(k - j) |
| 85 | // eprintln('> j: ${j} | k: ${k} | start: ${start} | middle: ${middle} | end: ${end}') |
| 86 | for i in 0 .. max { |
| 87 | a[i] = 0 |
| 88 | } |
| 89 | assert a[j..k].hex() == middle |
| 90 | for i in 0 .. 10 { |
| 91 | rng.read(mut a[j..k]) |
| 92 | // dump(a.hex()) |
| 93 | assert a[0..j].hex() == start |
| 94 | assert a[k..].hex() == end |
| 95 | if a[j..k].hex() != middle { |
| 96 | differences++ |
| 97 | } |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | dump(differences) |
| 102 | assert differences > 11700 // normally around 11758 |
| 103 | } |
| 104 | |