diff options
Diffstat (limited to 'tests')
| -rw-r--r-- | tests/queries/test_qs_combinators.py | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/tests/queries/test_qs_combinators.py b/tests/queries/test_qs_combinators.py index a0faab2eb7..ec341952ea 100644 --- a/tests/queries/test_qs_combinators.py +++ b/tests/queries/test_qs_combinators.py @@ -45,6 +45,31 @@ class QuerySetSetOperationTests(TestCase): self.assertEqual(len(list(qs1.union(qs2, all=True))), 20) self.assertEqual(len(list(qs1.union(qs2))), 10) + @skipUnlessDBFeature('supports_select_intersection') + def test_intersection_with_empty_qs(self): + qs1 = Number.objects.all() + qs2 = Number.objects.none() + self.assertEqual(len(qs1.intersection(qs2)), 0) + self.assertEqual(len(qs2.intersection(qs1)), 0) + self.assertEqual(len(qs2.intersection(qs2)), 0) + + @skipUnlessDBFeature('supports_select_difference') + def test_difference_with_empty_qs(self): + qs1 = Number.objects.all() + qs2 = Number.objects.none() + self.assertEqual(len(qs1.difference(qs2)), 10) + self.assertEqual(len(qs2.difference(qs1)), 0) + self.assertEqual(len(qs2.difference(qs2)), 0) + + def test_union_with_empty_qs(self): + qs1 = Number.objects.all() + qs2 = Number.objects.none() + self.assertEqual(len(qs1.union(qs2)), 10) + self.assertEqual(len(qs2.union(qs1)), 10) + self.assertEqual(len(qs2.union(qs1, qs1, qs1)), 10) + self.assertEqual(len(qs2.union(qs1, qs1, all=True)), 20) + self.assertEqual(len(qs2.union(qs2)), 0) + def test_union_bad_kwarg(self): qs1 = Number.objects.all() msg = "union() received an unexpected keyword argument 'bad'" |