def test_particleless(self): with pytest.raises(ValueError): mass_density(1 * u.m**-3)
def test_wrong_units(self): with pytest.raises(ValueError): mass_density(1 * u.J)
def time_mass_density(self): mass_density(1 * u.m ** -3,'p')
def test_particleless(self): with pytest.raises(ValueError): mass_density(1 * u.m**-3)
def test_wrong_units(self): with pytest.raises(ValueError): mass_density(1 * u.J)
def time_mass_density(self): mass_density(1 * u.m ** -3,'p')