Refs #34701 -- Moved UniqueConstraint(nulls_distinct) validation tests.

The original tests required the creation of a model that is no longer necessary
and were exercising Model.full_clean(validate_constraints) which has nothing
to do with the nulls_distinct feature.

tests/constraints/tests.py

@@ -1070,6 +1070,19 @@ class UniqueConstraintTests(TestCase):
         is_not_null_constraint.validate(Product, Product(price=4, discounted_price=3))
         is_not_null_constraint.validate(Product, Product(price=2, discounted_price=1))
 
+    def test_validate_nulls_distinct_fields(self):
+        Product.objects.create(price=42)
+        constraint = models.UniqueConstraint(
+            fields=["price"],
+            nulls_distinct=False,
+            name="uniq_prices_nulls_distinct",
+        )
+        constraint.validate(Product, Product(price=None))
+        Product.objects.create(price=None)
+        msg = "Product with this Price already exists."
+        with self.assertRaisesMessage(ValidationError, msg):
+            constraint.validate(Product, Product(price=None))
+
     def test_validate_nulls_distinct_expressions(self):
         Product.objects.create(price=42)
         constraint = models.UniqueConstraint(

tests/validation/models.py

@@ -217,17 +217,3 @@ class UniqueConstraintConditionProduct(models.Model):
                 condition=models.Q(color__isnull=True),
             ),
         ]
-
-
-class UniqueConstraintNullsDistinctProduct(models.Model):
-    name = models.CharField(max_length=255, blank=True, null=True)
-
-    class Meta:
-        required_db_features = {"supports_nulls_distinct_unique_constraints"}
-        constraints = [
-            models.UniqueConstraint(
-                fields=["name"],
-                name="name_nulls_not_distinct_uniq",
-                nulls_distinct=False,
-            ),
-        ]

tests/validation/test_constraints.py

@@ -6,7 +6,6 @@ from .models import (
     ChildUniqueConstraintProduct,
     Product,
     UniqueConstraintConditionProduct,
-    UniqueConstraintNullsDistinctProduct,
     UniqueConstraintProduct,
 )
 
@@ -94,25 +93,3 @@ class PerformConstraintChecksTest(TestCase):
         UniqueConstraintConditionProduct.objects.create(name="product")
         product = UniqueConstraintConditionProduct(name="product")
         product.full_clean(validate_constraints=False)
-
-    @skipUnlessDBFeature("supports_nulls_distinct_unique_constraints")
-    def test_full_clean_with_nulls_distinct_unique_constraints(self):
-        UniqueConstraintNullsDistinctProduct.objects.create(name=None)
-        product = UniqueConstraintNullsDistinctProduct(name=None)
-        with self.assertRaises(ValidationError) as cm:
-            product.full_clean()
-        self.assertEqual(
-            cm.exception.message_dict,
-            {
-                "name": [
-                    "Unique constraint nulls distinct product with this Name "
-                    "already exists."
-                ]
-            },
-        )
-
-    @skipUnlessDBFeature("supports_nulls_distinct_unique_constraints")
-    def test_full_clean_with_nulls_distinct_unique_constraints_disabled(self):
-        UniqueConstraintNullsDistinctProduct.objects.create(name=None)
-        product = UniqueConstraintNullsDistinctProduct(name=None)
-        product.full_clean(validate_constraints=False)