def test_clone_dangling_parameters():
g = Graph()
g.output = Parameter(g)
g2 = clone(g)
assert isinstance(g2.output, Parameter)
assert g2.output.graph == g2
assert len(g2.parameters) == 0
def test_helpers():
g = Graph()
cg = Constant(g)
assert cg.is_constant(Graph)
assert cg.is_constant_graph()
one = Constant(1)
assert one.is_constant()
assert one.is_constant(int)
assert not one.is_constant(str)
assert not one.is_constant_graph()
a = Apply([cg, one], g)
assert a.is_apply()
p = Parameter(g)
assert p.is_parameter()
s = Special(1234, g)
assert s.is_special()
assert s.is_special(int)
assert not s.is_special(str)