Fixed #28164 -- Improved float conversions in DecimalField.to_python

Thanks Tim Graham and Adam Johnson for the reviews.

1 files changed, 6 insertions, 0 deletions

diff --git a/tests/model_fields/test_decimalfield.py b/tests/model_fields/test_decimalfield.py
index 2f4540c81d..5163d8188b 100644
--- a/tests/model_fields/test_decimalfield.py
+++ b/tests/model_fields/test_decimalfield.py
@@ -15,6 +15,12 @@ class DecimalFieldTests(TestCase):
         f = models.DecimalField(max_digits=4, decimal_places=2)
         self.assertEqual(f.to_python(3), Decimal('3'))
         self.assertEqual(f.to_python('3.14'), Decimal('3.14'))
+        # to_python() converts floats and honors max_digits.
+        self.assertEqual(f.to_python(3.1415926535897), Decimal('3.142'))
+        self.assertEqual(f.to_python(2.4), Decimal('2.400'))
+        # Uses default rounding of ROUND_HALF_EVEN.
+        self.assertEqual(f.to_python(2.0625), Decimal('2.062'))
+        self.assertEqual(f.to_python(2.1875), Decimal('2.188'))
         with self.assertRaises(ValidationError):
             f.to_python('abc')