import unittest.mock

import printpub.post.id


def test_id_generation_has_unique_and_nonunique_part():
    now_seconds = 1689031817.358745
    with unittest.mock.patch("time.time", return_value=now_seconds):
        id1 = printpub.post.id.generate()
        id2 = printpub.post.id.generate()

        time_mask = int("1" * 42 + "0" * (64 - 42), 2)
        # The first 42 bits should be the time
        assert id1 & time_mask == id2 & time_mask
        # The last bits should be random
        assert id1 & (~time_mask) != id2 & (~time_mask)