Add new_device_discovered event (#4132)

homeassistant/components/device_tracker/__init__.py

@@ -55,6 +55,8 @@ DEFAULT_SCAN_INTERVAL = 12
 CONF_AWAY_HIDE = 'hide_if_away'
 DEFAULT_AWAY_HIDE = False
 
+EVENT_NEW_DEVICE = 'device_tracker_new_device'
+
 SERVICE_SEE = 'see'
 
 ATTR_MAC = 'mac'
@@ -236,9 +238,12 @@ class DeviceTracker(object):
 
             device.seen(host_name, location_name, gps, gps_accuracy, battery,
                         attributes)
+
             if device.track:
                 device.update_ha_state()
 
+            self.hass.bus.async_fire(EVENT_NEW_DEVICE, device)
+
             # During init, we ignore the group
             if self.group is not None:
                 self.group.update_tracked_entity_ids(

tests/components/device_tracker/test_init.py

@@ -306,6 +306,24 @@ class TestComponentsDeviceTracker(unittest.TestCase):
         self.assertEqual(mock_see.call_count, 1)
         self.assertEqual(mock_see.call_args, call(**params))
 
+    def test_new_device_event_fired(self):
+        """Test that the device tracker will fire an event."""
+        self.assertTrue(setup_component(self.hass, device_tracker.DOMAIN,
+                                        TEST_PLATFORM))
+        test_events = []
+
+        def listener(event):
+            """Helper method that will verify our event got called."""
+            test_events.append(event)
+
+        self.hass.bus.listen("device_tracker_new_device", listener)
+
+        device_tracker.see(self.hass, 'mac_1', host_name='hello')
+        device_tracker.see(self.hass, 'mac_1', host_name='hello')
+
+        self.hass.block_till_done()
+        self.assertEqual(1, len(test_events))
+
     # pylint: disable=invalid-name
     def test_not_write_duplicate_yaml_keys(self):
         """Test that the device tracker will not generate invalid YAML."""