Introduce delay to job submission to prevent session being closed.

tests/backend_test.py

@@ -14,6 +14,7 @@
 import json
 import os
 from collections import Counter
+from time import sleep
 from typing import Dict, cast
 from warnings import warn
 import math
@@ -1090,6 +1091,7 @@ def test_postprocess(lagos_backend: IBMQBackend) -> None:
     c = Circuit(2, 2)
     c.SX(0).SX(1).CX(0, 1).measure_all()
     c = b.get_compiled_circuit(c)
+    sleep(10)
     h = b.process_circuit(c, n_shots=10, postprocess=True)
     ppcirc = Circuit.from_dict(json.loads(cast(str, h[3])))
     ppcmds = ppcirc.get_commands()