def test_construction_acyclic(self):
a = Node('a')
b = Node('b', a)
c = Node('c', b)
try:
a.add_parent(c)
assert False
except ValueError:
assert True
def test_construction_index_out_of_bounds(self):
b = Node('b')
c = Node('c')
try:
c.add_parent(b, index=13)
b._add_child(c, index=13)
assert False
except ValueError:
assert True
def test_construction_add(self):
b = Node('b')
c = Node('c')
d = Node('d')
c.add_parent(b)
assert c.parents == [b]
assert b.children == [c]
b._add_child(d)
assert b.children == [c, d]
assert d.parents == [] # _add_child doesn't call add_parent
def test_construction_add_index(self):
b = Node('b')
c = Node('c', b)
d = Node('d')
e = Node('e')
c.add_parent(d, index=0, index_child=0)
assert c.parents == [d, b]
assert b.children == [c]
assert d.children == [c]
b._add_child(e, index=0)
assert b.children == [e, c]
assert e.parents == [] # _add_child doesn't call add_parent
def test_construction_unique(self):
b = Node('b')
c = Node('c', b)
c.add_parent(b)
assert c.parents == [b]
assert b.children == [c]