Fix Freebox disk free space sensor (#99757)

* Fix Freebox disk free space sensor

* Add initial value assert to check results

tests/components/freebox/test_sensor.py

@@ -0,0 +1,45 @@
+"""Tests for the Freebox sensors."""
+from copy import deepcopy
+from unittest.mock import Mock
+
+from freezegun.api import FrozenDateTimeFactory
+
+from homeassistant.components.freebox import SCAN_INTERVAL
+from homeassistant.components.sensor import DOMAIN as SENSOR_DOMAIN
+from homeassistant.core import HomeAssistant
+
+from .common import setup_platform
+from .const import DATA_STORAGE_GET_DISKS
+
+from tests.common import async_fire_time_changed
+
+
+async def test_disk(
+    hass: HomeAssistant, freezer: FrozenDateTimeFactory, router: Mock
+) -> None:
+    """Test disk sensor."""
+    await setup_platform(hass, SENSOR_DOMAIN)
+
+    # Initial state
+    assert (
+        router().storage.get_disks.return_value[2]["partitions"][0]["total_bytes"]
+        == 1960000000000
+    )
+
+    assert (
+        router().storage.get_disks.return_value[2]["partitions"][0]["free_bytes"]
+        == 1730000000000
+    )
+
+    assert hass.states.get("sensor.freebox_free_space").state == "88.27"
+
+    # Simulate a changed storage size
+    data_storage_get_disks_changed = deepcopy(DATA_STORAGE_GET_DISKS)
+    data_storage_get_disks_changed[2]["partitions"][0]["free_bytes"] = 880000000000
+    router().storage.get_disks.return_value = data_storage_get_disks_changed
+    # Simulate an update
+    freezer.tick(SCAN_INTERVAL)
+    async_fire_time_changed(hass)
+    # To execute the save
+    await hass.async_block_till_done()
+    assert hass.states.get("sensor.freebox_free_space").state == "44.9"