def test_ShadowedList__reverse__values_and_shadow_values_identical(self):
# ShadowList.reverse() works also when passed the same
# sequence as values and as shadow_values.
list_ = range(3)
shadow_list = ShadowedList(list_, list_)
shadow_list.reverse()
self.assertEqual(0, shadow_list[-1])
self.assertEqual(2, shadow_list[0])
self.assertEqual(0, shadow_list.shadow_values[-1])
self.assertEqual(2, shadow_list.shadow_values[0])
def test_ShadowedList__add(self):
# Two shadowedLists can be added, yielding another ShadowedList.
list1 = range(3)
list2 = self.makeStringSequence(list1)
shadow_list1 = ShadowedList(list1, list2)
list3 = range(4)
list4 = self.makeStringSequence(list3)
shadow_list2 = ShadowedList(list3, list4)
list_sum = shadow_list1 + shadow_list2
self.assertIsInstance(list_sum, ShadowedList)
self.assertEqual(list1 + list3, list_sum.values)
self.assertEqual(list2 + list4, list_sum.shadow_values)
def test_ShadowedList__reverse(self):
# ShadowList.reverse() reverses its elements.
list1 = range(3)
list2 = self.makeStringSequence(list1)
first1 = list1[0]
last1 = list1[-1]
first2 = list2[0]
last2 = list2[-1]
shadow_list = ShadowedList(list1, list2)
shadow_list.reverse()
self.assertEqual(first1, shadow_list[-1])
self.assertEqual(last1, shadow_list[0])
self.assertEqual(first2, shadow_list.shadow_values[-1])
self.assertEqual(last2, shadow_list.shadow_values[0])
def test_ShadowedList__getitem(self):
# Accessing a single element of a ShadowedList is equivalent to
# accessig an element of its values attribute.
list1 = range(3)
list2 = self.makeStringSequence(list1)
shadowed_list = ShadowedList(list1, list2)
self.assertEqual(list1[1], shadowed_list[1])
def test_ShadowedList__init(self):
# ShadowedList instances need two lists as constructor parametrs.
list1 = range(3)
list2 = self.makeStringSequence(list1)
shadowed_list = ShadowedList(list1, list2)
self.assertEqual(shadowed_list.values, list1)
self.assertEqual(shadowed_list.shadow_values, list2)
def test_ShadowedList__slice(self):
# A slice of a ShadowedList contains the slices of its
# values and shaow_values.
list1 = range(5)
list2 = self.makeStringSequence(list1)
shadowed_list = ShadowedList(list1, list2)
self.assertEqual(list1[2:4], shadowed_list[2:4].values)
self.assertEqual(list2[2:4], shadowed_list[2:4].shadow_values)
def test_ShadowedList__iterator(self):
# Iterating over a ShadowedList yields if values elements.
list1 = range(3)
list2 = self.makeStringSequence(list1)
shadow_list = ShadowedList(list1, list2)
self.assertEqual(list1, list(iter(shadow_list)))
def test_ShadowedList__len(self):
# The length of a ShadowedList ist the same as the list of
# the sequences it stores.
list1 = range(3)
list2 = self.makeStringSequence(list1)
self.assertEqual(len(list1), len(ShadowedList(list1, list2)))