def test__sub__KnownValues(self):
# __sub__ should give known result with known input
# commuting the input should result in equal magnitude, opposite sign
x = NumberDict()
y = NumberDict()
x['t1'], x['t2'] = 1, 2
y['t1'], y['t2'] = 2, 1
result1, result2 = x - y, y - x
self.assertEqual((-1, 1), (result1['t1'], result1['t2']))
self.assertEqual((1, -1), (result2['t1'], result2['t2']))
def test__add__KnownValues(self):
# __add__ should give known result with known input
# for non-string data types, addition must be commutative
x = NumberDict()
y = NumberDict()
x['t1'], x['t2'] = 1, 2
y['t1'], y['t2'] = 2, 1
result1, result2 = x + y, y + x
self.assertEqual((3, 3), (result1['t1'], result1['t2']))
self.assertEqual((3, 3), (result2['t1'], result2['t2']))
def test__mul__KnownValues(self):
# __mul__ should give known result with known input
x = NumberDict([('t1', 1), ('t2', 2)])
y = 10
result1, result2 = x * y, y * x
self.assertEqual((10, 20), (result1['t1'], result1['t2']))
self.assertEqual((10, 20), (result2['t1'], result2['t2']))
def test_UnknownKeyGives0(self):
# a NumberDict instance should initilize using integer and non-integer indices
# a NumberDict instance should initilize all entries with an initial
# value of 0
x = NumberDict()
# integer test
self.assertEqual(x[0], 0)
# string test
self.assertEqual(x['t'], 0)