def test_degree(self):
"""Tests the degree methods in a graph.
"""
graph = Graph(graph = { 'A' : ['B', 'C'], 'B' : ['A'], 'C' : [] })
self.assertEqual(graph.interior_degree('A'), 1, 'There is 1 edge coming to A.')
self.assertEqual(graph.exterior_degree('A'), 2, 'There are 2 edges extending from A.')
self.assertEqual(graph.degree('A'), 3, 'There are 3 edges from and to A.')
