def test_empty_dict(self):
"""Test creation of bimap from empty dictionary."""
bimap = BiMap(dict())
self.assertEqual(0, len(bimap))
self.assertEqual(dict(), bimap.get_key_to_value())
self.assertEqual(dict(), bimap.get_value_to_key())
def test_add_by_value_to_empty(self):
"""Test adding a single item to empty bimap by value."""
bimap = BiMap()
bimap.add_value("first", 1)
self.assertEqual({1: "first"}, bimap.get_key_to_value())
self.assertEqual(1, len(bimap))
self.assertEqual(1, bimap.get_value("first"))
self.assertEqual("first", bimap.get_key(1))
class TestCreateEmpty(unittest.TestCase):
"""
Test the constructor.
"""
def setUp(self):
self.bimap = BiMap()
def test_new_map_is_empty(self):
"""Test whether a newly created bimap is empty if not given any arguments."""
self.assertEqual(dict(), self.bimap.get_key_to_value())
self.assertEqual(dict(), self.bimap.get_value_to_key())
self.assertEqual(0, len(self.bimap))
def test_nonempty_dict(self):
"""Test creation of bimap from nonemtpy dictionary."""
dictionary = {1: "first", 2: "second"}
bimap = BiMap(dictionary)
reverse = dict()
for key in dictionary:
reverse[dictionary[key]] = key
self.assertEqual(2, len(bimap))
self.assertEqual(dictionary, bimap.get_key_to_value())
self.assertEqual("first", bimap.get_key(1))
self.assertEqual(2, bimap.get_value("second"))
self.assertEqual(reverse, bimap.get_value_to_key())