The URL-image tests hard-coded port 5555 and never shut the server down,
so a leftover or concurrent run left the port occupied and the readiness
loop fell through silently — the tests then ran against whatever was
listening, or against nothing.
Use werkzeug's make_server on port 0, record the assigned port, and shut
the server down in tearDownClass. The readiness loop now raises instead
of falling through when the server never comes up.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
dtourolleandClaude Opus 5
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