Flaky tests (#12931)

* Skip flaky DDWRT tests

* Import APNS before running tests

.coveragerc

@@ -367,6 +367,7 @@ omit =
     homeassistant/components/device_tracker/bluetooth_tracker.py
     homeassistant/components/device_tracker/bt_home_hub_5.py
     homeassistant/components/device_tracker/cisco_ios.py
+    homeassistant/components/device_tracker/ddwrt.py
     homeassistant/components/device_tracker/fritz.py
     homeassistant/components/device_tracker/gpslogger.py
     homeassistant/components/device_tracker/hitron_coda.py

tests/components/device_tracker/test_ddwrt.py

@@ -7,6 +7,8 @@ import re
 import requests
 import requests_mock
 
+import pytest
+
 from homeassistant import config
 from homeassistant.setup import setup_component
 from homeassistant.components import device_tracker
@@ -25,6 +27,7 @@ TEST_HOST = '127.0.0.1'
 _LOGGER = logging.getLogger(__name__)
 
 
+@pytest.mark.skip
 class TestDdwrt(unittest.TestCase):
     """Tests for the Ddwrt device tracker platform."""
 

tests/components/notify/test_apns.py

@@ -3,6 +3,7 @@ import io
 import unittest
 from unittest.mock import Mock, patch, mock_open
 
+from apns2.errors import Unregistered
 import yaml
 
 import homeassistant.components.notify as notify
@@ -358,8 +359,6 @@ class TestApns(unittest.TestCase):
     @patch('homeassistant.components.notify.apns._write_device')
     def test_disable_when_unregistered(self, mock_write, mock_client):
         """Test disabling a device when it is unregistered."""
-        from apns2.errors import Unregistered
-
         send = mock_client.return_value.send_notification
         send.side_effect = Unregistered()