58 lines
1.2 KiB
V
58 lines
1.2 KiB
V
import rand
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import rand.util
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fn test_sample_nr() {
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lengths := [1, 3, 4, 5, 6, 7]
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a := ['one', 'two', 'three', 'four', 'five', 'six', 'seven']
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for length in lengths {
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b := util.sample_nr(a, length)
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assert b.len == length
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for element in b {
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assert element in a
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// make sure every element occurs once
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mut count := 0
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for e in b {
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if e == element {
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count++
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}
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}
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assert count == 1
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}
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}
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}
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fn test_sample_r() {
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k := 20
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a := ['heads', 'tails']
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b := util.sample_r(a, k)
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assert b.len == k
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for element in b {
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assert element in a
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}
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}
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fn test_shuffle() {
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rand.seed([u32(1), 2]) // set seed to produce same results in order
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a := [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
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mut b := a.clone()
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mut c := a.clone()
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util.shuffle(mut b, 0)
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util.shuffle(mut c, 0)
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assert b == [6, 4, 5, 1, 9, 2, 10, 3, 8, 7]
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assert c == [1, 6, 5, 8, 7, 2, 10, 9, 3, 4]
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// test shuffling a slice
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mut d := a.clone()
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util.shuffle(mut d[..5], 0)
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assert d == [5, 2, 1, 3, 4, 6, 7, 8, 9, 10]
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assert d[5..] == a[5..]
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// test shuffling n items
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mut e := a.clone()
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util.shuffle(mut e, 5)
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assert e[..5] == [10, 3, 1, 8, 4]
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assert e[5..] == [6, 7, 5, 9, 2]
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// test shuffling empty array
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mut f := a[..0]
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util.shuffle(mut f, 0)
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assert f == []int{}
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}
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