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v/vlib/rand/random_numbers_test.v
2021-01-26 19:26:05 +02:00

191 lines
3.3 KiB
V

import rand
const (
rnd_count = 40
seeds = [[u32(42), 0], [u32(256), 0]]
)
fn get_n_random_ints(seed_data []u32, n int) []int {
mut values := []int{cap: n}
rand.seed(seed_data)
for _ in 0 .. n {
values << rand.intn(n)
}
return values
}
fn test_rand_reproducibility() {
for seed in seeds {
array1 := get_n_random_ints(seed, 1000)
array2 := get_n_random_ints(seed, 1000)
assert array1.len == array2.len
assert array1 == array2
}
}
fn test_rand_u32n() {
max := u32(16384)
for _ in 0 .. rnd_count {
value := rand.u32n(max)
assert value >= 0
assert value < max
}
}
fn test_rand_u64n() {
max := u64(379091181005)
for _ in 0 .. rnd_count {
value := rand.u64n(max)
assert value >= 0
assert value < max
}
}
fn test_rand_u32_in_range() {
max := u32(484468466)
min := u32(316846)
for _ in 0 .. rnd_count {
value := rand.u32_in_range(min, max)
assert value >= min
assert value < max
}
}
fn test_rand_u64_in_range() {
max := u64(216468454685163)
min := u64(6848646868)
for _ in 0 .. rnd_count {
value := rand.u64_in_range(min, max)
assert value >= min
assert value < max
}
}
fn test_rand_intn() {
max := 2525642
for _ in 0 .. rnd_count {
value := rand.intn(max)
assert value >= 0
assert value < max
}
}
fn test_rand_i64n() {
max := i64(3246727724653636)
for _ in 0 .. rnd_count {
value := rand.i64n(max)
assert value >= 0
assert value < max
}
}
fn test_rand_int_in_range() {
min := -4252
max := 23054962
for _ in 0 .. rnd_count {
value := rand.int_in_range(min, max)
assert value >= min
assert value < max
}
}
fn test_rand_i64_in_range() {
min := i64(-24095)
max := i64(324058)
for _ in 0 .. rnd_count {
value := rand.i64_in_range(min, max)
assert value >= min
assert value < max
}
}
fn test_rand_int31() {
max_u31 := int(0x7FFFFFFF)
sign_mask := int(0x80000000)
for _ in 0 .. rnd_count {
value := rand.int31()
assert value >= 0
assert value <= max_u31
// This statement ensures that the sign bit is zero
assert (value & sign_mask) == 0
}
}
fn test_rand_int63() {
max_u63 := i64(0x7FFFFFFFFFFFFFFF)
sign_mask := i64(0x8000000000000000)
for _ in 0 .. rnd_count {
value := rand.int63()
assert value >= 0
assert value <= max_u63
assert (value & sign_mask) == 0
}
}
fn test_rand_f32() {
for _ in 0 .. rnd_count {
value := rand.f32()
assert value >= 0.0
assert value < 1.0
}
}
fn test_rand_f64() {
for _ in 0 .. rnd_count {
value := rand.f64()
assert value >= 0.0
assert value < 1.0
}
}
fn test_rand_f32n() {
max := f32(357.0)
for _ in 0 .. rnd_count {
value := rand.f32n(max)
assert value >= 0.0
assert value < max
}
}
fn test_rand_f64n() {
max := f64(1.52e6)
for _ in 0 .. rnd_count {
value := rand.f64n(max)
assert value >= 0.0
assert value < max
}
}
fn test_rand_f32_in_range() {
min := f32(-24.0)
max := f32(125.0)
for _ in 0 .. rnd_count {
value := rand.f32_in_range(min, max)
assert value >= min
assert value < max
}
}
fn test_rand_f64_in_range() {
min := f64(-548.7)
max := f64(5015.2)
for _ in 0 .. rnd_count {
value := rand.f64_in_range(min, max)
assert value >= min
assert value < max
}
}
fn test_rand_byte() {
mut all := []byte{}
for _ in 0 .. 256 {
x := rand.byte()
assert x >= 0
assert x <= 255
all << x
}
all.sort(a < b)
assert all[0] != all[255]
assert all[0] != all[128]
}