add migration test

tests/sentry/migrations/test_0647_apitoken_add_hashed_columns.py

@@ -0,0 +1,31 @@
+from django.db import router
+
+from sentry.silo import unguarded_write
+from sentry.testutils.cases import TestMigrations
+from sentry.testutils.silo import no_silo_test
+
+
+@no_silo_test
+class AddHashedColumnsApiToken(TestMigrations):
+    migrate_from = "0646_create_notification_message_table"
+    migrate_to = "0647_apitoken_add_hashed_columns"
+
+    def setUp(self):
+        from sentry.models.apitoken import ApiToken
+
+        with unguarded_write(using=router.db_for_write(ApiToken)):
+            super().setUp()
+
+    def setup_before_migration(self, apps):
+        ApiToken = apps.get_model("sentry", "ApiToken")
+        self.api_token = ApiToken.objects.create(
+            user_id=self.user.id,
+        )
+        self.api_token.save()
+
+    def test(self):
+        from sentry.models.apitoken import ApiToken
+
+        api_token = ApiToken.objects.get()
+        assert api_token.hashed_token is None
+        assert api_token.hashed_refresh_token is None