def testUnitSystem(self):
""" Tests the creation of a UnitSystem and its behavior """
us = u.UnitSystem([
u.ScaledUnit(1.0, u.coulomb / u.second, 'ampere', 'A'),
u.second_base_unit
])
self.assertEqual(us.express_unit(u.second), u.second)
self.assertEqual(us.express_unit(u.hour), u.second)
self.assertNotEqual(u.hour, u.second)
self.assertEqual(us.express_unit(u.coulomb / u.second), u.ampere)
self.assertEqual(us.express_unit(u.meter / u.second),
u.meter / u.second)
self.assertEqual(us.express_unit(u.kilometer / u.hour),
u.kilometer / u.second)
x = 100 * u.millimeters
self.assertEqual(x.value_in_unit_system(u.si_unit_system), 0.1)
self.assertEqual(x.value_in_unit_system(u.cgs_unit_system), 10.0)
self.assertAlmostEqual(x.value_in_unit_system(u.md_unit_system), 1e8)
y = 20 * u.millimeters / u.millisecond**2
self.assertAlmostEqual(y.value_in_unit_system(u.si_unit_system), 2e4)
self.assertAlmostEqual(y.value_in_unit_system(u.cgs_unit_system), 2e6)
self.assertAlmostEqual(y.value_in_unit_system(u.md_unit_system),
2e-11,
places=18)
kcal = 1 * u.md_kilocalorie / u.mole
self.assertEqual(kcal.value_in_unit_system(u.md_unit_system), 4.184)
def testScaledUnit(self):
""" Tests ScaledUnit class with kilokelvins """
kK = u.ScaledUnit(1000.0, u.kelvin, "kilokelvin", "kK")
self.assertIs(kK.master, u.kelvin)
self.assertEqual(kK.factor, 1000)
self.assertEqual(str(kK), 'kilokelvin')
self.assertEqual(kK.name, 'kilokelvin')
self.assertEqual(kK.symbol, 'kK')
def testCreateNewScaledUnit(self):
""" Tests creating a new ScaledUnit """
mC = u.milli * u.ScaledUnit(4.184, u.joule, "calorie", "cal")
self.assertIsInstance(mC, u.ScaledUnit)
self.assertEqual(repr(mC),
"ScaledUnit(factor=0.004184, master=joule, name='millicalorie',"
" symbol='mcal')")
self.assertFalse(u.is_unit(mC))