wait for cancelled

Author: jan-janssen

tests/test_cache_fileexecutor_serial.py

@@ -1,4 +1,4 @@
-from concurrent.futures import Future
+from concurrent.futures import Future, CancelledError
 import os
 from queue import Queue
 import shutil
@@ -161,6 +161,9 @@ def test_executor_function_cancel_false(self):
             },
         )
         process.start()
+        self.assertFalse(fs1.done())
+        with self.assertRaises(CancelledError):
+            fs1.result()
         self.assertTrue(fs1.cancelled())
         sleep(2)
         process = Thread(