def removePartEdge_test():
G = Graph()
G.add_nodes_from(Friends)
G.add_edges_from(Relationships)
exp = G.edges()
# remove an edge but give a single part of the edge
G.remove_edge(['Alex'])
obs = G.edges()
assert_equal(exp, obs)
def addNoEdge_test():
G = Graph()
G.add_nodes_from(Friends)
G.add_edges_from(Relationships)
exp = G.edges()
# remove an edge but give an empty list
G.remove_edge([])
obs = G.edges()
assert_equal(exp, obs)
def removeEdgeMorethan2_test():
G = Graph()
G.add_nodes_from(Friends)
G.add_edges_from(Relationships)
# remove an edge but give three entries
G.remove_edge(['Alex', 'Julie', 'Michael'])
exp = 21
obs = len(G.edges())
assert_equal(exp, obs)
