codon/test/stdlib/random_test.codon

import random as R
import time
import sys
from copy import copy

seed = int(time.time())
# sys.stderr.write('seed: ' + str(seed) + '\n')
R.seed(seed)


@test
def test_rnd_result(name, results, invariant):
    print name
    for a in results:
        assert invariant(a)


test_rnd_result(
    "randrange", [R.randrange(10) for _ in range(100)], range(10).__contains__
)
test_rnd_result(
    "randrange", [R.randrange(5, 20) for _ in range(100)], range(5, 20).__contains__
)
test_rnd_result(
    "randrange",
    [R.randrange(9, 99, 3) for _ in range(100)],
    range(9, 99, 3).__contains__,
)
test_rnd_result(
    "randint", [R.randint(5, 20) for _ in range(100)], range(5, 20 + 1).__contains__
)

population = list("ABCDEFGHIJKLMNOP")
test_rnd_result(
    "choice", [R.choice(population) for _ in range(100)], population.__contains__
)
test_rnd_result(
    "choice", [R.choice(population) for _ in range(100)], population.__contains__
)
test_rnd_result("choices", R.choices(population), population.__contains__)
test_rnd_result("choices", R.choices(population, k=100), population.__contains__)


@test
def test_shuffle(v):
    s = copy(v)
    R.shuffle(s)
    assert sorted(v) == sorted(s)


test_shuffle(list(range(100)))


@test
def test_sample(n: int, k: int):
    s = R.sample(list(range(n)), k=k)
    assert len(s) == k
    assert len(set(s)) == len(s)
    for a in s:
        assert a in range(n)


test_sample(100, 5)
test_sample(100, 100)
test_sample(100, 0)