def test_undirected_edge_get(self):
""" Get an attribute of an undirected edge """
v0 = UndirectedVertex(val='v0')
v1 = UndirectedVertex(val='v1')
e01 = UndirectedEdge((v0, v1), attrs={'weight': 5})
self.assertEqual(e01.get('weight'), 5)
self.assertIsNone(e01.get('notthere'))
def test_undirected_edge_attrs(self):
""" Get an undirected edge's attrs property """
v0 = UndirectedVertex(val='v0')
v1 = UndirectedVertex(val='v1')
e01 = UndirectedEdge((v0, v1), {'weight': 5})
self.assertEqual(e01.attrs, {'weight': 5})
with self.assertRaises(AttributeError):
e01.attrs = {'key': 'value'}
def test_undirected_edge_vertices(self):
""" Get an undirected edge's vertices property """
v0 = UndirectedVertex(val='v0')
v1 = UndirectedVertex(val='v1')
e01 = UndirectedEdge((v0, v1))
self.assertEqual(e01.vertices, frozenset([v0, v1]))
with self.assertRaises(AttributeError):
e01.vertices = frozenset()
def test_undirected_edge_is_self_edge(self):
""" Get an undirected edge's is_self_edge property """
v0 = UndirectedVertex(val='v0')
v1 = UndirectedVertex(val='v1')
e00 = UndirectedEdge((v0, v0))
e01 = UndirectedEdge((v0, v1))
self.assertTrue(e00.is_self_edge)
self.assertFalse(e01.is_self_edge)
with self.assertRaises(AttributeError):
e00.is_self_edge = False
def test_undirected_edge_del_attr(self):
""" Delete an attribute of an undirected edge """
v0 = UndirectedVertex(val='v0')
v1 = UndirectedVertex(val='v1')
e01 = UndirectedEdge((v0, v1), attrs={'weight': 5, 0: 1})
e01.del_attr('weight')
self.assertEqual(e01.attrs, {0: 1})
e01.del_attr(0)
self.assertEqual(e01.attrs, {})
def test_undirected_edge_set(self):
""" Set an attribute of an undirected edge """
v0 = UndirectedVertex(val='v0')
v1 = UndirectedVertex(val='v1')
e01 = UndirectedEdge((v0, v1))
e01.set('weight', 5)
self.assertEqual(e01.attrs, {'weight': 5})
e01.set(0, 1)
self.assertEqual(e01.attrs, {'weight': 5, 0: 1})
def test_undirected_edge_has_attr(self):
""" Check if an undirected edge has a particular attribute """
v0 = UndirectedVertex(val='v0')
v1 = UndirectedVertex(val='v1')
e01 = UndirectedEdge((v0, v1), attrs={'weight': 5, 0: 1})
self.assertTrue(e01.has_attr('weight'))
self.assertFalse(e01.has_attr('length'))
e01.del_attr('weight')
self.assertFalse(e01.has_attr('weight'))