Use API to discover Hue if no bridges specified (#11909)

* Use API to discover Hue if no bridges specified

* hide config file

tests/components/test_hue.py

@@ -1,12 +1,12 @@
 """Generic Philips Hue component tests."""
-
+import asyncio
 import logging
 import unittest
 from unittest.mock import call, MagicMock, patch
 
 from homeassistant.components import configurator, hue
 from homeassistant.const import CONF_FILENAME, CONF_HOST
-from homeassistant.setup import setup_component
+from homeassistant.setup import setup_component, async_setup_component
 
 from tests.common import (
     assert_setup_component, get_test_home_assistant, get_test_config_dir,
@@ -38,15 +38,6 @@ class TestSetup(unittest.TestCase):
             mock_phue.Bridge.assert_not_called()
             self.assertEquals({}, self.hass.data[hue.DOMAIN])
 
-    @MockDependency('phue')
-    def test_setup_no_host(self, mock_phue):
-        """No host specified in any way."""
-        with assert_setup_component(1):
-            self.assertTrue(setup_component(
-                self.hass, hue.DOMAIN, {hue.DOMAIN: {}}))
-            mock_phue.Bridge.assert_not_called()
-            self.assertEquals({}, self.hass.data[hue.DOMAIN])
-
     @MockDependency('phue')
     def test_setup_with_host(self, mock_phue):
         """Host specified in the config file."""
@@ -400,3 +391,17 @@ class TestHueBridge(unittest.TestCase):
                 {hue.ATTR_GROUP_NAME: 'group', hue.ATTR_SCENE_NAME: 'scene'},
                 blocking=True)
             bridge.bridge.run_scene.assert_called_once_with('group', 'scene')
+
+
+@asyncio.coroutine
+def test_setup_no_host(hass, requests_mock):
+    """No host specified in any way."""
+    requests_mock.get(hue.API_NUPNP, json=[])
+    with MockDependency('phue') as mock_phue:
+        result = yield from async_setup_component(
+            hass, hue.DOMAIN, {hue.DOMAIN: {}})
+        assert result
+
+        mock_phue.Bridge.assert_not_called()
+
+        assert hass.data[hue.DOMAIN] == {}