Restore bthome state at start when device is in range or sleepy (#97949)

tests/components/bthome/test_sensor.py

@@ -1195,3 +1195,67 @@ async def test_sleepy_device(hass: HomeAssistant) -> None:
     await hass.async_block_till_done()
 
     assert entry.data[CONF_SLEEPY_DEVICE] is True
+
+
+async def test_sleepy_device_restore_state(hass: HomeAssistant) -> None:
+    """Test sleepy device does not go to unavailable after 60 minutes and restores state."""
+    start_monotonic = time.monotonic()
+
+    entry = MockConfigEntry(
+        domain=DOMAIN,
+        unique_id="A4:C1:38:8D:18:B2",
+        data={},
+    )
+    entry.add_to_hass(hass)
+
+    assert await hass.config_entries.async_setup(entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert len(hass.states.async_all()) == 0
+
+    inject_bluetooth_service_info(
+        hass,
+        make_bthome_v2_adv(
+            "A4:C1:38:8D:18:B2",
+            b"\x44\x04\x13\x8a\x01",
+        ),
+    )
+    await hass.async_block_till_done()
+
+    assert len(hass.states.async_all()) == 1
+
+    pressure_sensor = hass.states.get("sensor.test_device_18b2_pressure")
+
+    assert pressure_sensor.state == "1008.83"
+
+    # Fastforward time without BLE advertisements
+    monotonic_now = start_monotonic + FALLBACK_MAXIMUM_STALE_ADVERTISEMENT_SECONDS + 1
+
+    with patch(
+        "homeassistant.components.bluetooth.manager.MONOTONIC_TIME",
+        return_value=monotonic_now,
+    ), patch_all_discovered_devices([]):
+        async_fire_time_changed(
+            hass,
+            dt_util.utcnow()
+            + timedelta(seconds=FALLBACK_MAXIMUM_STALE_ADVERTISEMENT_SECONDS + 1),
+        )
+        await hass.async_block_till_done()
+
+    pressure_sensor = hass.states.get("sensor.test_device_18b2_pressure")
+
+    # Sleepy devices should keep their state over time
+    assert pressure_sensor.state == "1008.83"
+
+    assert await hass.config_entries.async_unload(entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert await hass.config_entries.async_setup(entry.entry_id)
+    await hass.async_block_till_done()
+
+    pressure_sensor = hass.states.get("sensor.test_device_18b2_pressure")
+
+    # Sleepy devices should keep their state over time and restore it
+    assert pressure_sensor.state == "1008.83"
+
+    assert entry.data[CONF_SLEEPY_DEVICE] is True