Reported from a live install: the entity never rendered, and every state write
raised ``TypeError: 'method' object is not iterable``.
Root cause, from HA's own code (homeassistant/helpers/entity.py,
``__async_calculate_state``):
if extra_state_attributes := self.extra_state_attributes:
attr |= extra_state_attributes
``attr`` is a dict, so ``|=`` needs a mapping — and this was declared as a plain
method while the sensors' were properties. Reproduced against the pre-fix tree
with real HA: instantiating the entity and calling ``async_write_ha_state()``
prints ``REPRODUCED TypeError: 'method' object is not iterable``; with the fix
the same call writes the state and the extra attributes through.
The stub suites could never see it: their harness replaces
``async_write_ha_state``, so the method was simply called and returned a dict.
tests/test_ha_api_drift.py now drives HA's real state calculation for every
entity, and the drift sweep grew an entity-contract pass (next commit).
James Mackay
acc7bc3d01
