def test_adding_edge_when_no_nodes_does_not_add_an_adge(self) -> None:
"""Test if adding an edge to empty graph fails as expected."""
source_id = _get_random_string()
target_id = _get_random_string()
graph = Graph()
graph.add_edge(source_id=source_id, target_id=target_id)
self.assertEqual([], graph.edges)
def test_adding_edge_between_nodes_works(self) -> None:
"""Test adding an edge."""
source = _get_random_node()
target = _get_random_node()
graph = Graph()
graph.add_node(source)
graph.add_node(target)
graph.add_edge(source_id=source.id, target_id=target.id)
edges = graph.edges
self.assertEqual(1, len(edges))
edge = edges[0]
self.assertEqual(source, edge._source)
self.assertEqual(target, edge._target)
def test_collapsing_external_group(self) -> None:
"""Test that no collapsing will happen when all groups are expanded."""
source = self._get_source_graph()
expected = Graph()
expected.add_node(_create_simple_node("input", []))
expected.add_node(_create_simple_node("a:b", ["a"]))
expected.add_node(_create_group_node("a:b"))
expected.add_node(_create_simple_node("e", ["e"]))
expected.add_node(_create_simple_node("output", []))
expected.add_edge("input", "a:b")
expected.add_edge("a:b", "node_group_a:b")
expected.add_edge("node_group_a:b", "output")
expected.add_edge("input", "e")
expected.add_edge("e", "output")
collapser = Collapser(["node_group_a"])
collapsed = collapser.collapse(graph=source)
self.assertEqual(expected, collapsed)
def _get_source_graph(self) -> Graph:
"""Return a graph with a well-known contents."""
graph = Graph()
graph.add_node(_create_simple_node("input", []))
graph.add_node(_create_simple_node("a:b", ["a"]))
graph.add_node(_create_simple_node("a:b:c1", ["a", "a:b"]))
graph.add_node(_create_simple_node("a:b:c2", ["a", "a:b"]))
graph.add_node(_create_simple_node("a:b:c:d", ["a", "a:b", "a:b:c"]))
graph.add_node(_create_simple_node("e", ["e"]))
graph.add_node(_create_simple_node("output", []))
graph.add_edge("input", "a:b")
graph.add_edge("a:b", "a:b:c1")
graph.add_edge("a:b", "a:b:c2")
graph.add_edge("a:b:c1", "a:b:c:d")
graph.add_edge("a:b:c2", "a:b:c:d")
graph.add_edge("a:b:c:d", "output")
graph.add_edge("input", "e")
graph.add_edge("e", "output")
return graph