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v/vlib/rand/random_numbers_test.v

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import rand
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import math
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const (
rnd_count = 40
seeds = [42, 256]
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)
fn test_rand_reproducibility() {
for seed in seeds {
mut randoms1 := gen_randoms(seed)
mut randoms2 := gen_randoms(seed)
assert_randoms_equal(randoms1, randoms2)
}
}
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fn test_rand_r_reproducibility() {
for seed in seeds {
mut randoms1 := gen_randoms_r(seed)
mut randoms2 := gen_randoms_r(seed)
assert_randoms_equal(randoms1, randoms2)
}
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}
fn test_rand_r_seed_update() {
seed := 10
for _ in 0 .. rnd_count {
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prev_seed := seed
_ := rand.rand_r(&seed)
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assert prev_seed != seed
}
}
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fn gen_randoms(seed int) []int {
mut randoms := [0].repeat(rnd_count)
rand.seed(seed)
for i in 0 .. rnd_count {
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randoms[i] = rand.next(100)
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}
return randoms
}
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fn gen_randoms_r(seed int) []int {
mut randoms := [0].repeat(rnd_count)
for i in 0 .. rnd_count {
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randoms[i] = rand.rand_r(&seed)
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}
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return randoms
}
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fn assert_randoms_equal(r1, r2 []int) {
for i in 0 .. rnd_count {
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assert r1[i] == r2[i]
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}
}