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#!/usr/bin/env python
# Licensed under a 3-clause BSD style license, see LICENSE.
"""
Tests for the hepunits.constants.constants module.
"""
from pytest import approx
from hepunits import *
from hepunits import THz, eV, nanometer, s
def test_constants():
assert pi_sq == two_pi * half_pi
assert Avogadro == 6.02214076e23
assert c_light / (m / s) == 299792458
assert hbarc_sq / c_light_sq == approx((h_Planck / two_pi) ** 2)
assert hbar / (eV * s) == hbar / 1.0e3
# wavelength of 555-ish nanometres (green light) has a frequency of 540 THz
assert c_light / (555.17121851852 * nanometer) == approx(540 * THz)
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