Revised HASS Core test

Changed the HASS Core test that tested KeyboardInterrupt handling to
now test SIGTERM handling. KeyboardInterrupts are no longer handled in
the HASS application process as they are handled in the HASS parent
process. SIGTERM is the proper way to now stop HASS.

tests/test_core.py

@@ -7,6 +7,7 @@ Provides tests to verify that Home Assistant core works.
 # pylint: disable=protected-access,too-many-public-methods
 # pylint: disable=too-few-public-methods
 import os
+import signal
 import unittest
 from unittest.mock import patch
 import time
@@ -79,15 +80,15 @@ class TestHomeAssistant(unittest.TestCase):
 
         self.assertFalse(blocking_thread.is_alive())
 
-    def test_stopping_with_keyboardinterrupt(self):
+    def test_stopping_with_sigterm(self):
         calls = []
         self.hass.bus.listen_once(EVENT_HOMEASSISTANT_STOP,
                                   lambda event: calls.append(1))
 
-        def raise_keyboardinterrupt(length):
-            raise KeyboardInterrupt
+        def send_sigterm(length):
+            os.kill(os.getpid(), signal.SIGTERM)
 
-        with patch('homeassistant.core.time.sleep', raise_keyboardinterrupt):
+        with patch('homeassistant.core.time.sleep', send_sigterm):
             self.hass.block_till_stopped()
 
         self.assertEqual(1, len(calls))