Refs #32132 -- Added rel_db_type() tests for auto and integer fields.

tests/model_fields/test_autofield.py

@@ -9,14 +9,17 @@ from .test_integerfield import (
 
 class AutoFieldTests(IntegerFieldTests):
     model = AutoModel
+    rel_db_type_class = models.IntegerField
 
 
 class BigAutoFieldTests(BigIntegerFieldTests):
     model = BigAutoModel
+    rel_db_type_class = models.BigIntegerField
 
 
 class SmallAutoFieldTests(SmallIntegerFieldTests):
     model = SmallAutoModel
+    rel_db_type_class = models.SmallIntegerField
 
 
 class AutoFieldInheritanceTests(SimpleTestCase):

tests/model_fields/test_integerfield.py

@@ -14,6 +14,7 @@ from .models import (
 class IntegerFieldTests(TestCase):
     model = IntegerModel
     documented_range = (-2147483648, 2147483647)
+    rel_db_type_class = models.IntegerField
 
     @property
     def backend_range(self):
@@ -154,15 +155,22 @@ class IntegerFieldTests(TestCase):
                 with self.assertRaisesMessage(exception, msg):
                     self.model.objects.create(value=value)
 
+    def test_rel_db_type(self):
+        field = self.model._meta.get_field('value')
+        rel_db_type = field.rel_db_type(connection)
+        self.assertEqual(rel_db_type, self.rel_db_type_class().db_type(connection))
+
 
 class SmallIntegerFieldTests(IntegerFieldTests):
     model = SmallIntegerModel
     documented_range = (-32768, 32767)
+    rel_db_type_class = models.SmallIntegerField
 
 
 class BigIntegerFieldTests(IntegerFieldTests):
     model = BigIntegerModel
     documented_range = (-9223372036854775808, 9223372036854775807)
+    rel_db_type_class = models.BigIntegerField
 
 
 class PositiveSmallIntegerFieldTests(IntegerFieldTests):
@@ -173,6 +181,11 @@ class PositiveSmallIntegerFieldTests(IntegerFieldTests):
 class PositiveIntegerFieldTests(IntegerFieldTests):
     model = PositiveIntegerModel
     documented_range = (0, 2147483647)
+    rel_db_type_class = (
+        models.PositiveIntegerField
+        if connection.features.related_fields_match_type
+        else models.IntegerField
+    )
 
     @unittest.skipIf(connection.vendor == 'sqlite', "SQLite doesn't have a constraint.")
     def test_negative_values(self):