def test_del_error():
"""error raised when non-existant value deleted"""
g = SimpleGraph()
g.add_node('a')
g.add_node('b')
g.add_node('c')
g.add_edge('a', 'c')
g.add_edge('a', 'b')
with pytest.raises(KeyError):
g.del_node('p')
def test_del_error():
"""error raised when non-existant value deleted"""
g = SimpleGraph()
g.add_node('a')
g.add_node('b')
g.add_node('c')
g.add_edge('a', 'c')
g.add_edge('a', 'b')
with pytest.raises(KeyError):
g.del_node('p')
def test_del_nodes():
"""nodes are deleted"""
g = SimpleGraph()
g.add_node('a')
g.add_node('b')
g.add_node('c')
g.add_edge('a', 'c')
g.add_edge('a', 'b')
g.del_node('a')
assert 'a' not in g.nodes()
assert g.has_node('a') is False
def test_del_nodes():
"""nodes are deleted"""
g = SimpleGraph()
g.add_node('a')
g.add_node('b')
g.add_node('c')
g.add_edge('a', 'c')
g.add_edge('a', 'b')
g.del_node('a')
assert 'a' not in g.nodes()
assert g.has_node('a') is False
def test_weighted_edges_with_node_delete():
g = SimpleGraph()
g.add_edge('a', 'b', 5)
g.add_edge('a', 'c', 2)
g.del_node('c')
assert g.dict_graph['a'] == {'b': 5}
def test_weighted_edges_with_node_delete():
g = SimpleGraph()
g.add_edge('a', 'b', 5)
g.add_edge('a', 'c', 2)
g.del_node('c')
assert g.dict_graph['a'] == {'b': 5}