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from numpy import isclose
import random
from tvm.autotvm import utils


SI_PREFIXES = "yzafpn\xb5m kMGTPEZY"


def test_format_si_prefix():
    # test float conversion
    assert utils.format_si_prefix(1024, "k") == 1.024

    for i, prefix in enumerate(SI_PREFIXES):
        integer, decimal = random.randint(0, 1000), random.randint(0, 1000)
        exp = -24 + 3 * i  # 0th prefix (yocto) is 10^-24
        number = integer * (10 ** exp) + decimal * (10 ** (exp - 3))
        expected = integer + decimal / 1000
        assert isclose(utils.format_si_prefix(number, prefix), expected)

    assert utils.format_si_prefix(0, "y") == 0


if __name__ == "__main__":
    test_format_si_prefix()