Move extract_entity_id to service helpers

tests/helpers/test_init.py

@@ -7,45 +7,22 @@ Tests component helpers.
 # pylint: disable=protected-access,too-many-public-methods
 import unittest
 
-import homeassistant.core as ha
-from homeassistant import loader, helpers
-from homeassistant.const import STATE_ON, STATE_OFF, ATTR_ENTITY_ID
+from homeassistant import helpers
 
 from tests.common import get_test_home_assistant
 
 
-class TestComponentsCore(unittest.TestCase):
-    """ Tests homeassistant.components module. """
+class TestHelpers(unittest.TestCase):
+    """ Tests homeassistant.helpers module. """
 
     def setUp(self):  # pylint: disable=invalid-name
         """ Init needed objects. """
         self.hass = get_test_home_assistant()
 
-        self.hass.states.set('light.Bowl', STATE_ON)
-        self.hass.states.set('light.Ceiling', STATE_OFF)
-        self.hass.states.set('light.Kitchen', STATE_OFF)
-
-        loader.get_component('group').setup_group(
-            self.hass, 'test', ['light.Ceiling', 'light.Kitchen'])
-
     def tearDown(self):  # pylint: disable=invalid-name
         """ Stop down stuff we started. """
         self.hass.stop()
 
-    def test_extract_entity_ids(self):
-        """ Test extract_entity_ids method. """
-        call = ha.ServiceCall('light', 'turn_on',
-                              {ATTR_ENTITY_ID: 'light.Bowl'})
-
-        self.assertEqual(['light.bowl'],
-                         helpers.extract_entity_ids(self.hass, call))
-
-        call = ha.ServiceCall('light', 'turn_on',
-                              {ATTR_ENTITY_ID: 'group.test'})
-
-        self.assertEqual(['light.ceiling', 'light.kitchen'],
-                         helpers.extract_entity_ids(self.hass, call))
-
     def test_extract_domain_configs(self):
         config = {
             'zone': None,