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v/vlib/crypto/rand/crypto_rand_bytes_test.v

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import crypto.rand
fn test_reading() ? {
a := rand.read(32)?
// dump(a.hex())
assert a.len == 32
mut histogram := [256]int{}
for b in a {
histogram[b]++
}
// dump(histogram)
for h in histogram {
assert h < 10
}
}