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import time
import rand
// uuid_v4:
fn test_rand_uuid_v4() {
uuid1 := rand.uuid_v4()
uuid2 := rand.uuid_v4()
uuid3 := rand.uuid_v4()
assert uuid1 != uuid2
assert uuid1 != uuid3
assert uuid2 != uuid3
assert uuid1.len == 36
assert uuid2.len == 36
assert uuid3.len == 36
assert uuid1[14] == `4`
assert uuid2[14] == `4`
assert uuid3[14] == `4`
}
// ulids:
fn test_ulids_are_unique() {
ulid1 := rand.ulid()
ulid2 := rand.ulid()
ulid3 := rand.ulid()
assert ulid1.len == 26
assert ulid2.len == 26
assert ulid3.len == 26
assert ulid1 != ulid2
assert ulid1 != ulid3
assert ulid2 != ulid3
}
fn test_ulids_max_start_character_is_ok() {
ulid1 := rand.ulid()
// the largest valid ULID encoded in Base32 is 7ZZZZZZZZZZZZZZZZZZZZZZZZZ
assert (int(ulid1[0]) - 48) <= 7
}
fn test_ulids_generated_in_the_same_millisecond_have_the_same_prefix() {
t := u64(time.utc().unix_time_milli())
mut ulid1 := ''
mut ulid2 := ''
mut ulid3 := ''
ulid1 = rand.ulid_at_millisecond(t)
ulid2 = rand.ulid_at_millisecond(t)
ulid3 = rand.ulid_at_millisecond(t)
ulid1_prefix := ulid1[0..10]
ulid2_prefix := ulid2[0..10]
ulid3_prefix := ulid3[0..10]
assert ulid1_prefix == ulid2_prefix
assert ulid1_prefix == ulid3_prefix
}
fn test_ulids_should_be_lexicographically_ordered_when_not_in_same_millisecond() {
ulid1 := rand.ulid()
time.sleep(1 * time.millisecond)
ulid2 := rand.ulid()
time.sleep(1 * time.millisecond)
ulid3 := rand.ulid()
mut all := [ulid3, ulid2, ulid1]
// eprintln('all before: $all')
all.sort()
// eprintln('all after: $all')
s1 := all[0]
s2 := all[1]
s3 := all[2]
assert s1 == ulid1
assert s2 == ulid2
assert s3 == ulid3
}
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