Change core return code processing (#88326)

Co-authored-by: J. Nick Koston <nick@koston.org>

tests/test_core.py

@@ -181,6 +181,46 @@ async def test_stage_shutdown(hass: HomeAssistant) -> None:
     assert len(test_all) == 2
 
 
+async def test_stage_shutdown_with_exit_code(hass):
+    """Simulate a shutdown, test calling stuff with exit code checks."""
+    test_stop = async_capture_events(hass, EVENT_HOMEASSISTANT_STOP)
+    test_final_write = async_capture_events(hass, EVENT_HOMEASSISTANT_FINAL_WRITE)
+    test_close = async_capture_events(hass, EVENT_HOMEASSISTANT_CLOSE)
+    test_all = async_capture_events(hass, MATCH_ALL)
+
+    event_call_counters = [0, 0, 0]
+    expected_exit_code = 101
+
+    async def async_on_stop(event) -> None:
+        if hass.exit_code == expected_exit_code:
+            event_call_counters[0] += 1
+
+    async def async_on_final_write(event) -> None:
+        if hass.exit_code == expected_exit_code:
+            event_call_counters[1] += 1
+
+    async def async_on_close(event) -> None:
+        if hass.exit_code == expected_exit_code:
+            event_call_counters[2] += 1
+
+    hass.bus.async_listen_once(EVENT_HOMEASSISTANT_STOP, async_on_stop)
+    hass.bus.async_listen_once(EVENT_HOMEASSISTANT_FINAL_WRITE, async_on_final_write)
+    hass.bus.async_listen_once(EVENT_HOMEASSISTANT_CLOSE, async_on_close)
+
+    await hass.async_stop(expected_exit_code)
+
+    assert len(test_stop) == 1
+    assert len(test_close) == 1
+    assert len(test_final_write) == 1
+    assert len(test_all) == 2
+
+    assert (
+        event_call_counters[0] == 1
+        and event_call_counters[1] == 1
+        and event_call_counters[2] == 1
+    )
+
+
 async def test_shutdown_calls_block_till_done_after_shutdown_run_callback_threadsafe(
     hass,
 ):