test: make characterization snapshot deterministic across machines

The spool sensor computes its 'used_percentage' attribute only in
_handle_coordinator_update(), not in the constructor. Whether that
handler had fired by the time the state snapshot was captured depended
on coordinator-update timing, so the attribute was present locally but
absent on CI — making test_all_entities_snapshot flaky (CI failure on
HA 2026.5.4 with otherwise-identical package versions).

Force one coordinator refresh in the setup_integration fixture after
setup so every entity's update handler runs deterministically before
the snapshot is taken. The committed snapshot is unchanged (it already
reflected the post-update state).

Author: Disane87

tests/conftest.py

@@ -198,8 +198,18 @@ async def setup_integration(
     config_entry: MockConfigEntry,
     mock_spoolman_api: aioresponses,
 ) -> MockConfigEntry:
-    """Boot the integration end-to-end against the mocked API."""
+    """Boot the integration end-to-end against the mocked API.
+
+    After setup we force one coordinator refresh so every entity's
+    ``_handle_coordinator_update`` runs deterministically. Some attributes
+    (e.g. the spool sensor's ``used_percentage``) are only computed in that
+    handler, not in the constructor; without this, whether they appear in a
+    state snapshot depends on update timing and diverges between machines
+    (local vs. CI), making the characterization snapshot flaky.
+    """
     config_entry.add_to_hass(hass)
     assert await hass.config_entries.async_setup(config_entry.entry_id)
     await hass.async_block_till_done()
+    await config_entry.runtime_data.coordinator.async_refresh()
+    await hass.async_block_till_done()
     return config_entry