fix sqlite tests

Author: dantownsend

tests/apps/migrations/auto/integration/test_migrations.py

@@ -15,8 +15,10 @@
 from piccolo.table import Table, create_table_class
 from piccolo.apps.migrations.tables import Migration
 from piccolo.utils.sync import run_sync
+from tests.base import postgres_only
 
 
+@postgres_only
 class TestMigrations(TestCase):
     def tearDown(self):
         create_table_class("MyTable").alter().drop_table(
@@ -61,6 +63,9 @@ def _test_migrations(self, table_classes: t.List[t.Type[Table]]):
 
             # TODO - check the migrations ran correctly
 
+    ###########################################################################
+    # Writing all of these by hand is going to be really tedious ...
+
     def test_add_varchar_column(self):
         self._test_migrations(
             table_classes=[