Refs #34986 -- Fixed some test assertions for PyPy.

These failures were due to minor inconsistencies or implementation
differences between CPython and PyPy.

tests/model_forms/tests.py

@@ -25,6 +25,7 @@ from django.test import SimpleTestCase, TestCase, ignore_warnings, skipUnlessDBF
 from django.test.utils import isolate_apps
 from django.utils.choices import BlankChoiceIterator
 from django.utils.deprecation import RemovedInDjango60Warning
+from django.utils.version import PYPY
 
 from .models import (
     Article,
@@ -3017,7 +3018,10 @@ class OtherModelFormTests(TestCase):
                 return ", ".join(c.name for c in obj.colours.all())
 
         field = ColorModelChoiceField(ColourfulItem.objects.prefetch_related("colours"))
-        with self.assertNumQueries(3):  # would be 4 if prefetch is ignored
+        # CPython calls ModelChoiceField.__len__() when coercing to tuple. PyPy
+        # doesn't call __len__() and so .count() isn't called on the QuerySet.
+        # The following would trigger an extra query if prefetch were ignored.
+        with self.assertNumQueries(2 if PYPY else 3):
             self.assertEqual(
                 tuple(field.choices),
                 (