Allow device_tracker platforms to specify picture and icon upon discovery (#8018)

* Allow device tracker platforms to specify picture

* Allow device tracker to specify icon during discovery

* Clean up and add tests

* Fix lint

* Fix test

tests/components/device_tracker/test_init.py

@@ -654,14 +654,25 @@ class TestComponentsDeviceTracker(unittest.TestCase):
 
         assert len(config) == 4
 
-    @patch('homeassistant.components.device_tracker.async_log_exception')
-    def test_config_failure(self, mock_ex):
+    def test_config_failure(self):
         """Test that the device tracker see failures."""
         with assert_setup_component(0, device_tracker.DOMAIN):
             setup_component(self.hass, device_tracker.DOMAIN,
                             {device_tracker.DOMAIN: {
                                 device_tracker.CONF_CONSIDER_HOME: -1}})
 
+    def test_picture_and_icon_on_see_discovery(self):
+        """Test that picture and icon are set in initial see."""
+        tracker = device_tracker.DeviceTracker(
+            self.hass, timedelta(seconds=60), False, [])
+        tracker.see(dev_id=11, picture='pic_url', icon='mdi:icon')
+        self.hass.block_till_done()
+        config = device_tracker.load_config(self.yaml_devices, self.hass,
+                                            timedelta(seconds=0))
+        assert len(config) == 1
+        assert config[0].icon == 'mdi:icon'
+        assert config[0].entity_picture == 'pic_url'
+
 
 @asyncio.coroutine
 def test_async_added_to_hass(hass):
@@ -691,3 +702,15 @@ def test_async_added_to_hass(hass):
     for key, val in attr.items():
         atr = state.attributes.get(key)
         assert atr == val, "{}={} expected: {}".format(key, atr, val)
+
+
+@asyncio.coroutine
+def test_bad_platform(hass):
+    """Test bad platform."""
+    config = {
+        'device_tracker': [{
+            'platform': 'bad_platform'
+        }]
+    }
+    with assert_setup_component(0, device_tracker.DOMAIN):
+        assert (yield from device_tracker.async_setup(hass, config))