the build of master is failing

[grant-allan-ctct]

Clicking on this red x on our front page here we see that the Linux build passed, the MacOS failed, the Windows build was not attempted.

Copilot suggests this about the failure:

The failure occurred in test/test_ca.py at test_addr_claim_fixed_reduced_time (line 78):
assert len(feeder.can_messages) == 0
But len(feeder.can_messages) was 1, not 0. This means a message remained unprocessed.

Problem:
In test_addr_claim_fixed_reduced_time, the following code controls the timing:
71|     new_ca.start(0.25)
75|     time.sleep(0.3)
This only waits 0.3 seconds after starting the ControllerApplication, which may not be enough on all systems for asynchronous message processing, especially with thread scheduling variance.

Solution:
Increase the sleep duration in the test to ensure all messages have been processed:

Replace:
time.sleep(0.3)
With:
time.sleep(0.6)

This will give the background thread enough time to process and clear feeder.can_messages before the assertion. Here’s the adjusted code block from test_addr_claim_fixed_reduced_time:

# wait until all messages are processed asynchronously 
# rounded up to account for scheduling delays
time.sleep(0.6)

Alternatively, use a polling loop similar to the one in address_claim to actively check until feeder.can_messages is empty:

while len(feeder.can_messages) > 0:
    time.sleep(0.1)
time.sleep(0.1)

Either of these will make the test more robust and prevent spurious failures caused by insufficient wait time.