diff --git a/tests/util/test_itertools.py b/tests/util/test_itertools.py
index 522c8061f9..1ef0af8e8f 100644
--- a/tests/util/test_itertools.py
+++ b/tests/util/test_itertools.py
@@ -92,3 +92,15 @@ class SortTopologically(TestCase):
# Valid orderings are `[1, 3, 2, 4]` or `[1, 2, 3, 4]`, but we should
# always get the same one.
self.assertEqual(list(sorted_topologically([4, 3, 2, 1], graph)), [1, 2, 3, 4])
+
+ def test_duplicates(self):
+ "Test that a graph with duplicate edges work"
+ graph = {1: [], 2: [1, 1], 3: [2, 2], 4: [3]} # type: Dict[int, List[int]]
+
+ self.assertEqual(list(sorted_topologically([4, 3, 2, 1], graph)), [1, 2, 3, 4])
+
+ def test_multiple_paths(self):
+ "Test that a graph with multiple paths between two nodes work"
+ graph = {1: [], 2: [1], 3: [2], 4: [3, 2, 1]} # type: Dict[int, List[int]]
+
+ self.assertEqual(list(sorted_topologically([4, 3, 2, 1], graph)), [1, 2, 3, 4])
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