Refs django#373 -- Simplified DatabaseIntrospection.get_constraints()…

… tests for composite primary keys.

tests/composite_pk/tests.py

@@ -1,5 +1,4 @@
 import json
-import unittest
 from uuid import UUID
 
 import yaml
@@ -35,9 +34,9 @@ def setUpTestData(cls):
         cls.comment = Comment.objects.create(tenant=cls.tenant, id=1, user=cls.user)
 
     @staticmethod
-    def get_constraints(table):
+    def get_primary_key_columns(table):
         with connection.cursor() as cursor:
-            return connection.introspection.get_constraints(cursor, table)
+            return connection.introspection.get_primary_key_columns(cursor, table)
 
     def test_pk_updated_if_field_updated(self):
         user = User.objects.get(pk=self.user.pk)
@@ -125,53 +124,15 @@ def test_error_on_comment_pk_conflict(self):
         with self.assertRaises(IntegrityError):
             Comment.objects.create(tenant=self.tenant, id=self.comment.id)
 
-    @unittest.skipUnless(connection.vendor == "postgresql", "PostgreSQL specific test")
-    def test_get_constraints_postgresql(self):
-        user_constraints = self.get_constraints(User._meta.db_table)
-        user_pk = user_constraints["composite_pk_user_pkey"]
-        self.assertEqual(user_pk["columns"], ["tenant_id", "id"])
-        self.assertIs(user_pk["primary_key"], True)
-
-        comment_constraints = self.get_constraints(Comment._meta.db_table)
-        comment_pk = comment_constraints["composite_pk_comment_pkey"]
-        self.assertEqual(comment_pk["columns"], ["tenant_id", "comment_id"])
-        self.assertIs(comment_pk["primary_key"], True)
-
-    @unittest.skipUnless(connection.vendor == "sqlite", "SQLite specific test")
-    def test_get_constraints_sqlite(self):
-        user_constraints = self.get_constraints(User._meta.db_table)
-        user_pk = user_constraints["__primary__"]
-        self.assertEqual(user_pk["columns"], ["tenant_id", "id"])
-        self.assertIs(user_pk["primary_key"], True)
-
-        comment_constraints = self.get_constraints(Comment._meta.db_table)
-        comment_pk = comment_constraints["__primary__"]
-        self.assertEqual(comment_pk["columns"], ["tenant_id", "comment_id"])
-        self.assertIs(comment_pk["primary_key"], True)
-
-    @unittest.skipUnless(connection.vendor == "mysql", "MySQL specific test")
-    def test_get_constraints_mysql(self):
-        user_constraints = self.get_constraints(User._meta.db_table)
-        user_pk = user_constraints["PRIMARY"]
-        self.assertEqual(user_pk["columns"], ["tenant_id", "id"])
-        self.assertIs(user_pk["primary_key"], True)
-
-        comment_constraints = self.get_constraints(Comment._meta.db_table)
-        comment_pk = comment_constraints["PRIMARY"]
-        self.assertEqual(comment_pk["columns"], ["tenant_id", "comment_id"])
-        self.assertIs(comment_pk["primary_key"], True)
-
-    @unittest.skipUnless(connection.vendor == "oracle", "Oracle specific test")
-    def test_get_constraints_oracle(self):
-        user_constraints = self.get_constraints(User._meta.db_table)
-        user_pk = next(c for c in user_constraints.values() if c["primary_key"])
-        self.assertEqual(user_pk["columns"], ["tenant_id", "id"])
-        self.assertEqual(user_pk["primary_key"], 1)
-
-        comment_constraints = self.get_constraints(Comment._meta.db_table)
-        comment_pk = next(c for c in comment_constraints.values() if c["primary_key"])
-        self.assertEqual(comment_pk["columns"], ["tenant_id", "comment_id"])
-        self.assertEqual(comment_pk["primary_key"], 1)
+    def test_get_primary_key_columns(self):
+        self.assertEqual(
+            self.get_primary_key_columns(User._meta.db_table),
+            ["tenant_id", "id"],
+        )
+        self.assertEqual(
+            self.get_primary_key_columns(Comment._meta.db_table),
+            ["tenant_id", "comment_id"],
+        )
 
     def test_in_bulk(self):
         """