diff --git a/tests/test_migrate.py b/tests/test_migrate.py
index ed53778..3a51e1b 100644
--- a/tests/test_migrate.py
+++ b/tests/test_migrate.py
@@ -1,6 +1,7 @@
 from tortoise import Tortoise
 
 from aerich.ddl.mysql import MysqlDDL
+from aerich.ddl.postgres import PostgresDDL
 from aerich.migrate import Migrate
 
 
@@ -19,6 +20,15 @@ def test_migrate():
             "ALTER TABLE `category` DROP COLUMN `name`",
             "ALTER TABLE `user` DROP INDEX `uid_user_usernam_9987ab`",
         ]
+    elif isinstance(Migrate.ddl, PostgresDDL):
+        assert Migrate.upgrade_operators == [
+            'ALTER TABLE "category" ADD "name" VARCHAR(200) NOT NULL',
+            'ALTER TABLE "user" ADD CONSTRAINT "uid_user_usernam_9987ab" UNIQUE ("username")',
+        ]
+        assert Migrate.downgrade_operators == [
+            'ALTER TABLE "category" DROP COLUMN "name"',
+            'ALTER TABLE "user" DROP CONSTRAINT "uid_user_usernam_9987ab"',
+        ]
     else:
         assert Migrate.upgrade_operators == [
             'ALTER TABLE "category" ADD "name" VARCHAR(200) NOT NULL',