52 lines
1.1 KiB
V
52 lines
1.1 KiB
V
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import rand
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fn test_rand_bytes() ? {
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mut randoms := []string{}
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for i in 0 .. 100 {
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x := rand.bytes(i) ?.hex()
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if x.len > 0 {
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randoms << x
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}
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assert x.len == i * 2
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}
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mut differences := 0
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for idx in 1 .. randoms.len {
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start := randoms[idx]#[0..8]
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prev_start := randoms[idx - 1]#[0..8]
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if start != prev_start {
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differences++
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}
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}
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assert differences > 95 // normally around 98
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dump(differences)
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}
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fn test_rand_read() ? {
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max := 50
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mut a := []byte{len: max}
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mut differences := 0
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for j in 1 .. max {
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start := '00'.repeat(j)
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for k in j + 1 .. max {
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end := '00'.repeat(max - k)
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middle := '00'.repeat(k - j)
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// eprintln('> j: $j | k: $k | start: $start | middle: $middle | end: $end')
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for i in 0 .. max {
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a[i] = 0
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}
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assert a[j..k].hex() == middle
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for i in 0 .. 10 {
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rand.read(mut a[j..k])
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// dump(a.hex())
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assert a[0..j].hex() == start
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assert a[k..].hex() == end
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if a[j..k].hex() != middle {
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differences++
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}
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}
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}
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}
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dump(differences)
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assert differences > 11700 // normally around 11758
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}
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