Fixed #26458 -- Based Avg's default output_field resolution on its source field type.

Thanks Tim for the review and Josh for the input.

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/aggregation/tests.py b/tests/aggregation/tests.py
index 2e68d0a7f3..758b101157 100644
--- a/tests/aggregation/tests.py
+++ b/tests/aggregation/tests.py
@@ -496,10 +496,16 @@ class AggregateTestCase(TestCase):
         self.assertEqual(vals, {"num_authors__avg": Approximate(1.66, places=1)})
 
     def test_avg_duration_field(self):
+        # Explicit `output_field`.
         self.assertEqual(
             Publisher.objects.aggregate(Avg('duration', output_field=DurationField())),
             {'duration__avg': datetime.timedelta(days=1, hours=12)}
         )
+        # Implicit `output_field`.
+        self.assertEqual(
+            Publisher.objects.aggregate(Avg('duration')),
+            {'duration__avg': datetime.timedelta(days=1, hours=12)}
+        )
 
     def test_sum_duration_field(self):
         self.assertEqual(