def test_moleculesperm3(self):
"""
Test the creation of an concentration quantity with units of molecules/m^3.
"""
q = quantity.Concentration(1.0, "molecules/m^3")
self.assertAlmostEqual(q.value, 1.0, 6)
self.assertAlmostEqual(q.value_si * constants.Na, 1.0, delta=1e-6)
self.assertEqual(q.units, "molecules/m^3")
def test_perm3(self):
"""
Test the creation of an concentration quantity with units of m^-3.
"""
try:
q = quantity.Concentration(1.0, "m^-3")
self.fail('Allowed invalid unit type "m^-3".')
except quantity.QuantityError:
pass
