mirror of https://github.com/django/django.git
31 lines
910 B
Python
31 lines
910 B
Python
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from django.test import SimpleTestCase
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from django.utils.topological_sort import (
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CyclicDependencyError,
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stable_topological_sort,
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topological_sort_as_sets,
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)
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class TopologicalSortTests(SimpleTestCase):
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def test_basic(self):
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dependency_graph = {
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1: {2, 3},
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2: set(),
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3: set(),
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4: {5, 6},
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5: set(),
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6: {5},
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}
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self.assertEqual(
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list(topological_sort_as_sets(dependency_graph)), [{2, 3, 5}, {1, 6}, {4}]
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)
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self.assertEqual(
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stable_topological_sort([1, 2, 3, 4, 5, 6], dependency_graph),
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[2, 3, 5, 1, 6, 4],
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)
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def test_cyclic_dependency(self):
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msg = "Cyclic dependency in graph: (1, {2}), (2, {1})"
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with self.assertRaisesMessage(CyclicDependencyError, msg):
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list(topological_sort_as_sets({1: {2}, 2: {1}}))
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