[4.0.x] Fixed #33333 -- Fixed setUpTestData() crash with models.BinaryField on PostgreSQL.

This makes models.BinaryField pickleable on PostgreSQL.

Regression in 3cf80d3fcf7446afdde16a2be515c423f720e54d.

Thanks Adam Zimmerman for the report.

Backport of 2c7846d992ca512d36a73f518205015c88ed088c from main.

2 files changed, 21 insertions, 0 deletions

diff --git a/tests/test_utils/models.py b/tests/test_utils/models.py
index b0497f12b9..57518aef90 100644
--- a/tests/test_utils/models.py
+++ b/tests/test_utils/models.py
@@ -8,6 +8,7 @@ class Car(models.Model):
 class Person(models.Model):
     name = models.CharField(max_length=100)
     cars = models.ManyToManyField(Car, through='PossessedCar')
+    data = models.BinaryField(null=True)
 
 
 class PossessedCar(models.Model):
diff --git a/tests/test_utils/test_testcase.py b/tests/test_utils/test_testcase.py
index 9b11168b13..0c2417c339 100644
--- a/tests/test_utils/test_testcase.py
+++ b/tests/test_utils/test_testcase.py
@@ -81,10 +81,15 @@ class TestDataTests(TestCase):
         )
         cls.non_deepcopy_able = NonDeepCopyAble()
 
+        cls.person_binary = Person.objects.create(name='Person', data=b'binary data')
+        cls.person_binary_get = Person.objects.get(pk=cls.person_binary.pk)
+
     @assert_no_queries
     def test_class_attribute_equality(self):
         """Class level test data is equal to instance level test data."""
         self.assertEqual(self.jim_douglas, self.__class__.jim_douglas)
+        self.assertEqual(self.person_binary, self.__class__.person_binary)
+        self.assertEqual(self.person_binary_get, self.__class__.person_binary_get)
 
     @assert_no_queries
     def test_class_attribute_identity(self):
@@ -92,6 +97,21 @@ class TestDataTests(TestCase):
         Class level test data is not identical to instance level test data.
         """
         self.assertIsNot(self.jim_douglas, self.__class__.jim_douglas)
+        self.assertIsNot(self.person_binary, self.__class__.person_binary)
+        self.assertIsNot(self.person_binary_get, self.__class__.person_binary_get)
+
+    @assert_no_queries
+    def test_binaryfield_data_type(self):
+        self.assertEqual(bytes(self.person_binary.data), b'binary data')
+        self.assertEqual(bytes(self.person_binary_get.data), b'binary data')
+        self.assertEqual(
+            type(self.person_binary_get.data),
+            type(self.__class__.person_binary_get.data),
+        )
+        self.assertEqual(
+            type(self.person_binary.data),
+            type(self.__class__.person_binary.data),
+        )
 
     @assert_no_queries
     def test_identity_preservation(self):