Add test for datasource type exclusion

Author: snickerjp

tests/tasks/test_refresh_schemas.py

@@ -1,5 +1,6 @@
 from mock import patch
 
+from redash import settings
 from redash.tasks import refresh_schemas
 from tests import BaseTestCase
 
@@ -23,3 +24,11 @@ def test_skips_paused_data_sources(self):
         with patch("redash.tasks.queries.maintenance.refresh_schema.delay") as refresh_job:
             refresh_schemas()
             refresh_job.assert_called()
+
+    def test_skips_excluded_datasource_types(self):
+        ds = self.factory.data_source
+        
+        with patch.object(settings, "SCHEMAS_REFRESH_EXCLUDED_TYPES", {ds.type}):
+            with patch("redash.tasks.queries.maintenance.refresh_schema.delay") as refresh_job:
+                refresh_schemas()
+                refresh_job.assert_not_called()