def test_remove_connected_vertex(self):
"""Tests the remove_vertex method for a connected vertex.
"""
data = { 'A' : ['B'], 'B' : ['A'] }
graph = Graph(graph=data)
self.assertTrue('B' in graph.connected_vertex('A'), 'There is an edge between A and B.')
self.assertTrue('A' in graph.connected_vertex('B'), 'There is an edge between A and B.')
graph.remove_vertex('A')
self.assertFalse('A' in graph.connected_vertex('B'), 'No more edge between A and B.')
def test_add_vertex_existing_one(self):
"""Tests the add_vertex method in a graph where the vertex to add already exists.
"""
data = { 'A' : ['B'] }
graph = Graph(graph=data)
connected = graph.connected_vertex('A')
self.assertTrue(graph.contains_vertex('A'), 'Graph contains the vertex A.')
self.assertEqual(connected[0], 'B', 'A has an edge to vertex B.')
graph.add_vertex('A')
connected = graph.connected_vertex('A')
self.assertTrue(graph.contains_vertex('A'), 'Graph still contains vertex A.')
self.assertEqual(connected[0], 'B', 'A still has an edge to vertex B.')
