def test_can_create_relationship(self):
a = Node("Person", name="Alice")
b = Node("Person", name="Bob")
r = Relationship(a, "KNOWS", b, since=1999)
self.graph.create(r)
assert remote(a)
assert remote(b)
assert remote(r)
assert r.start_node() == a
assert r.end_node() == b
def test_can_create_nodes_and_relationship(self):
self.graph.delete_all()
a = Node()
b = Node()
c = Node()
ab = Relationship(a, "TO", b)
bc = Relationship(b, "TO", c)
ca = Relationship(c, "TO", a)
self.graph.create(ab | bc | ca)
assert remote(a)
assert remote(b)
assert remote(c)
assert remote(ab)
assert ab.start_node() == a
assert ab.end_node() == b
assert remote(bc)
assert bc.start_node() == b
assert bc.end_node() == c
assert remote(ca)
assert ca.start_node() == c
assert ca.end_node() == a
assert order(self.graph) == 3
assert size(self.graph) == 3
def test_construction_from_three_arguments(self):
rel = Relationship(alice, "KNOWS", bob)
assert rel.start_node() is alice
assert rel.end_node() is bob
assert rel.type() == "KNOWS"
def test_construction_from_node_and_type_arguments(self):
rel = Relationship(alice, "LIKES")
assert rel.start_node() is alice
assert rel.end_node() is alice
assert rel.type() == "LIKES"
def test_construction_from_one_argument(self):
rel = Relationship(alice)
assert rel.start_node() is alice
assert rel.end_node() is alice
assert rel.type() == "TO"