CI failed one test that passes here: "no such table: settings", seeding a
Setting into a database with no tables. The test was not wrong about the
product, it was asking the process-wide plugin_manager to do the work.
create_app() re-points that singleton, and eight test modules build their own
app, so it belongs to whichever ran last on the xdist worker.
_seed_plugin_settings then opens `with self._app.app_context()` on a different
app's in-memory SQLite. A sibling symptom is the registry coming back None
("'NoneType' object has no attribute 'get_all'"). Both land on whichever test
follows, never on the module that caused them, so they move with the split -
green on one machine, red on another.
The test now builds a manager for itself, sets _app and _db, and calls
_seed_plugin_settings directly. That is the routine `flask plugin upgrade-all`
runs, so what is under test has not changed, and the assertion no longer depends
on worker order. init_app is deliberately not called: it re-registers the plugin
blueprints and a second call on one app raises "The name 'backups' is already
registered".
This does NOT fix the underlying fragility, and that is a separate decision.
Running tests/test_plugins serially today gives 115 failed and 542 errors, from
the same cause; under -n auto it is nearly invisible because modules land in
separate processes. The repair is to stop create_app mutating a module-level
singleton, and it belongs in its own change rather than riding along here.
f16b463736