def test_add_same_units(self):
"""Add two amounts having the same units.
"""
# Results in pounds
self.failUnlessEqual(add_amount(2.0, 'pound', 0.5, 'pound'), 2.5)
self.failUnlessEqual(add_amount(0.5, 'pound', 2.0, 'pound'), 2.5)
# Results in ounces
self.failUnlessEqual(add_amount(12.0, 'ounce', 4.0, 'ounce'), 16.0)
self.failUnlessEqual(add_amount(4.0, 'ounce', 12.0, 'ounce'), 16.0)
def test_add_different_units(self):
"""Add two amounts having different units.
"""
# Results in pounds
self.failUnlessEqual(add_amount(2, 'pound', 4, 'ounce'), 2.25)
self.failUnlessEqual(add_amount(2, 'pound', 12, 'ounce'), 2.75)
self.failUnlessEqual(add_amount(0.5, 'pound', 4, 'ounce'), 0.75)
self.failUnlessEqual(add_amount(0.5, 'pound', 12, 'ounce'), 1.25)
# Results in ounces
self.failUnlessEqual(add_amount(4, 'ounce', 2, 'pound'), 36.0)
self.failUnlessEqual(add_amount(12, 'ounce', 2, 'pound'), 44.0)
self.failUnlessEqual(add_amount(4, 'ounce', 0.5, 'pound'), 12.0)
self.failUnlessEqual(add_amount(12, 'ounce', 0.5, 'pound'), 20.0)
