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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
import unittest
from traits.observation._observer_graph import ObserverGraph
def graph_from_nodes(*nodes):
nodes = nodes[::-1]
graph = ObserverGraph(node=nodes[0])
for node in nodes[1:]:
graph = ObserverGraph(node=node, children=[graph])
return graph
class TestObserverGraph(unittest.TestCase):
""" Test generic functions on ObserverGraph."""
def test_equality(self):
graph1 = graph_from_nodes(1, 2, 3)
graph2 = graph_from_nodes(1, 2, 3)
self.assertEqual(graph1, graph2)
self.assertEqual(hash(graph1), hash(graph2))
def test_equality_different_type(self):
graph1 = graph_from_nodes(1, 2, 3)
self.assertNotEqual(graph1, 1)
def test_equality_different_length_children(self):
graph1 = ObserverGraph(
node=1,
children=[
ObserverGraph(node=2),
ObserverGraph(node=3),
],
)
graph2 = ObserverGraph(
node=1,
children=[
ObserverGraph(node=2),
],
)
self.assertNotEqual(graph1, graph2)
def test_equality_order_of_children(self):
# The order of items in children does not matter
graph1 = ObserverGraph(
node=1,
children=[
ObserverGraph(node=2),
ObserverGraph(node=3),
],
)
graph2 = ObserverGraph(
node=1,
children=[
ObserverGraph(node=3),
ObserverGraph(node=2),
],
)
self.assertEqual(graph1, graph2)
self.assertEqual(hash(graph1), hash(graph2))
def test_children_ordered(self):
child_graph = ObserverGraph(node=2)
graph = ObserverGraph(
node=1,
children=[
child_graph,
ObserverGraph(node=3),
],
)
self.assertIs(graph.children[0], child_graph)
def test_children_unique(self):
child_graph = ObserverGraph(node=2)
with self.assertRaises(ValueError) as exception_cm:
ObserverGraph(
node=1,
children=[
child_graph,
ObserverGraph(node=2),
],
)
self.assertEqual(
str(exception_cm.exception), "Not all children are unique.")
def test_slots(self):
graph = ObserverGraph(node=1)
with self.assertRaises(AttributeError):
graph.__dict__
with self.assertRaises(AttributeError):
graph.__weakref__
def test_eval_repr_roundtrip(self):
graph = ObserverGraph(
node=1,
children=[
ObserverGraph(node=2),
ObserverGraph(node=3),
],
)
self.assertEqual(eval(repr(graph)), graph)
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