Tests: don't dump when testing fishy rolenames

Don't dump rolenames when testing fishy rolenames as this leads to an
error:
"PermissionError: [Errno 13] Permission denied: '/.json'"

Signed-off-by: Martin Vrachev <[email protected]>

Author: MVrachev

tests/test_updater_with_simulator.py

@@ -137,6 +137,10 @@ def test_targets(self, test_case_data: Tuple[str, bytes, str]) -> None:
         self.assertEqual(path, updater.find_cached_target(info, path))
 
     def test_fishy_rolenames(self) -> None:
+        # Don't write in a dump folder during this test as role names could be
+        # pointing to invalid or not permitted places.
+        self.sim.dump_dir = None
+
         roles_to_filenames = {
             "../a": "..%2Fa.json",
             ".": "..json",