The aiodocker 0.25.0 upgrade (PR #6448) changed how DockerError handles
the message parameter. The library now extracts the message string from
Docker API JSON responses before passing it to DockerError, rather than
passing the entire dict.
The port conflict detection tests were written before this change and
incorrectly passed dicts to DockerError. This caused TypeErrors when
the port conflict detection code tried to match err.message with a
regex, expecting a string but receiving a dict.
Update both test_addon_start_port_conflict_error and
test_observer_start_port_conflict to pass message strings directly,
matching the real aiodocker 0.25.0 behavior.
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
* Map port conflict on start error into a known error
* Apply suggestions from code review
* Run ruff format
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Co-authored-by: Stefan Agner <stefan@agner.ch>
