def test_error_thrown(self):
"""Nodes without output ports cannot produce output.
.. note::
This is very different from python's functions that return None
by default.
"""
with self.assertRaises(dl.data_types.DeltaIOError):
with dl.DeltaGraph():
no_message = terminate_non_const(5)
terminate_non_const(no_message)
def test_non_split_fails_check(self):
"""If splitter nodes are not added for some reason, for instnance
if the graph is hacked by Deltahackers, we raise an error.
"""
with dl.DeltaGraph() as graph:
output = return_1_non_const()
terminate_non_const(output)
terminate_non_const(output)
terminate_non_const(output)
# note: we are still in the "with" context
with self.assertRaises(dl.data_types.DeltaIOError):
graph.check()
def test_const_node(self):
"""Constant node has one output reused multiple times."""
with dl.DeltaGraph() as graph:
output = return_1_const()
terminate_non_const(output)
terminate_non_const(output)
terminate_non_const(output)
self.assertTrue(graph.check())
self.assertEqual(len(graph.nodes), 5)
self.assertEqual(type(graph.find_node_by_name("return_1_const").body),
dl.wiring.PyConstBody)
self.assertEqual(type(graph.find_node_by_name("splitter").body),
dl.wiring.PyConstBody)
def test_non_const_node_via_placeholder(self):
"""Non-constant node created via a placeholder has one output reused
multiple times."""
with dl.DeltaGraph() as graph:
output = dl.placeholder_node_factory()
terminate_non_const(output)
terminate_non_const(output)
terminate_non_const(output)
output.specify_by_node(return_1_non_const())
self.assertTrue(graph.check())
self.assertEqual(len(graph.nodes), 5)
self.assertEqual(
type(graph.find_node_by_name("return_1_non_const").body),
dl.wiring.PyFuncBody)
self.assertEqual(type(graph.find_node_by_name("splitter").body),
dl.wiring.PyFuncBody)