Fix broken tests (#3704)

* Fix broken tests

* Lint

homeassistant/core.py

@@ -204,8 +204,6 @@ class HomeAssistant(object):
         except KeyboardInterrupt:
             self.loop.call_soon(stop_homeassistant)
             self.loop.run_forever()
-        finally:
-            self.loop.close()
 
     @asyncio.coroutine
     def async_start(self):

tests/common.py

@@ -79,8 +79,9 @@ def get_test_home_assistant(num_threads=None):
                 with patch.object(ha, 'async_create_timer', return_value=None):
                     with patch.object(ha, 'async_monitor_worker_pool',
                                       return_value=None):
-                        orig_start()
-                        hass.block_till_done()
+                        with patch.object(hass.loop, 'add_signal_handler'):
+                            orig_start()
+                            hass.block_till_done()
 
     def stop_hass():
         orig_stop()

tests/test_core.py

@@ -2,8 +2,6 @@
 # pylint: disable=protected-access,too-many-public-methods
 # pylint: disable=too-few-public-methods
 import asyncio
-import os
-import signal
 import unittest
 from unittest.mock import patch, MagicMock
 from datetime import datetime, timedelta
@@ -15,8 +13,7 @@ from homeassistant.exceptions import InvalidEntityFormatError
 import homeassistant.util.dt as dt_util
 from homeassistant.util.unit_system import (METRIC_SYSTEM)
 from homeassistant.const import (
-    __version__, EVENT_HOMEASSISTANT_START, EVENT_HOMEASSISTANT_STOP,
-    EVENT_STATE_CHANGED, ATTR_FRIENDLY_NAME, CONF_UNIT_SYSTEM)
+    __version__, EVENT_STATE_CHANGED, ATTR_FRIENDLY_NAME, CONF_UNIT_SYSTEM)
 
 from tests.common import get_test_home_assistant