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import astropy.units as u
import numpy as np
import pytest
from astropy import constants
from numpy.testing import assert_allclose
from einsteinpy.constant import Cosmo_Const, Cosmo_Const_base
def test_Cosmo_Const_returns_correct_value_units():
cnst = Cosmo_Const
assert cnst.value == 2.036e-35
assert isinstance(cnst.unit, u.core.CompositeUnit)
assert isinstance(cnst, u.quantity.Quantity)
def test_Cosmo_const_is_astropy_constant_with_unit_and_uncert():
cnst = Cosmo_Const_base
assert isinstance(cnst, constants.Constant)
assert cnst.uncertainty == 8.1e-40
assert cnst.unit == u.Unit("1 / s2")
def test_Cosmo_Const_has_correct_metadata():
cnst = Cosmo_Const_base
assert cnst.name == "Cosmological Constant"
assert cnst.system == "si" and cnst.abbrev == "lambda"
assert cnst.reference == "Wikipedia"
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