Wait to stop receiving D-Bus signals in monitor script

We want to verify that stratisd is not sending more signals before we
verify that the results are correct in the script itself.

Don't delay when running the test, since the script will do the delay
itself.

Signed-off-by: mulhern <amulhern@redhat.com>

Author: mulkieran

scripts/monitor_dbus_signals.py

@@ -429,6 +429,9 @@ def main():
 
 except KeyboardInterrupt:
 
+    # isort: STDLIB
+    import copy
+
     class Diff:  # pylint: disable=too-few-public-methods
         """
         Diff between two different managed object results.
@@ -731,6 +734,14 @@ def _check():
         print(os.linesep.join(_CALLBACK_ERRORS))
         sys.exit(3)
 
+    for _ in range(3):
+        current = copy.deepcopy(_MO)
+        time.sleep(15)
+        if current == _MO:
+            break
+    else:
+        sys.exit(4)
+
     try:
         result = _check()
     except Exception as exco:  # pylint: disable=broad-except

testlib/infra.py

@@ -543,19 +543,16 @@ def setUp(self):
             except FileNotFoundError as err:
                 raise RuntimeError("monitor_dbus_signals script not found.") from err
 
-    def run_check(self, stop_time):
+    def run_check(self):
         """
         Stop the D-Bus monitor script and check the results.
-
-        :param int stop_time: the time the test completed
         """
         trace = getattr(self, "trace", None)
         if trace is not None:
             # A sixteen second wait will make it virtually certain that
             # stratisd has a chance to do one of its 10 second timer passes on
             # pools and filesystems _and_ that the D-Bus task has at least one
             # second to send out any resulting signals.
-            time.sleep(sleep_time(stop_time, 16))
             self.trace.send_signal(signal.SIGINT)
             (stdoutdata, stderrdata) = self.trace.communicate()
 
@@ -677,7 +674,7 @@ def teardown(self):
         Run post-test checks after test is completed.
         """
         stop_time = time.monotonic_ns()
-        self.dbus_monitor.run_check(stop_time)
+        self.dbus_monitor.run_check()
 
         SysfsMonitor().run_check()
         SymlinkMonitor().run_check()