Automate post-import refresh and validation workflow

tests/test_python36_compat.py

@@ -0,0 +1,23 @@
+import unittest
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+POST_IMPORT_SCRIPTS = [
+    ROOT / "post_import_refresh.py",
+    ROOT / "stage_post_import_payload.py",
+    ROOT / "reset_helpdesk_mail_settings.py",
+    ROOT / "validate_test_instance.py",
+    ROOT / "redmine_outbox_worker.py",
+]
+
+
+class Python36CompatTest(unittest.TestCase):
+    def test_post_import_scripts_do_not_use_subprocess_text_keyword(self):
+        for path in POST_IMPORT_SCRIPTS:
+            with self.subTest(path=path.name):
+                self.assertNotIn("text=True", path.read_text())
+
+
+if __name__ == "__main__":
+    unittest.main()