bail out when kivy is missing a video provider (#267)

* bail out when kivy is missing a video provider

* add small video integration test

* fix integration tests with current dev

mpfmc/assets/video.py

@@ -1,4 +1,6 @@
 from kivy.core.video import Video
+from kivy.core.video.video_null import VideoNull
+
 from mpf.core.assets import Asset, AssetPool
 
 
@@ -107,6 +109,9 @@ def is_loaded(self):
         self._video = Video(filename=self.file)
         self._video.bind(on_load=self._check_duration)
 
+        if isinstance(self._video, VideoNull):
+            raise AssertionError("Kivy cannot load video {} because there is no provider.".format(self.file))
+
         self._call_callbacks()
 
     def _check_duration(self, instance):

mpfmc/integration/machine_files/basic_game/config/basic_game.yaml

@@ -11,8 +11,12 @@ coils:
   drain:
     number:
 
+playfields:
+  playfield:
+    default_source_device: bd_drain
+
 ball_devices:
   bd_drain:
     eject_coil: drain
     ball_switches: drain
-    tags: trough, drain, ball_add_live
+    tags: trough, drain

mpfmc/integration/machine_files/video/config/config.yaml

@@ -0,0 +1,9 @@
+#config_version=4
+
+displays:
+  default:
+    width: 400
+    height: 300
+
+modes:
+  - mode1

mpfmc/integration/machine_files/video/modes/mode1/config/mode1.yaml

@@ -0,0 +1,18 @@
+#config_version=4
+
+mode:
+  priority: 100
+  start_events: start_mode1
+  stop_events: stop_mode1
+  game_mode: false
+
+
+slide_player:
+  mode_mode1_started:
+    mode1_slide1:
+      widgets:
+      - type: video
+        video: mpf_video_small_test2
+      - type: text
+        text: Video from Mode
+        y: bottom+20%

mpfmc/integration/test_Video.py

@@ -0,0 +1,27 @@
+import time
+
+from mpfmc.tests.MpfIntegrationTestCase import MpfIntegrationTestCase
+
+
+class TestVideo(MpfIntegrationTestCase):
+
+    def getMachinePath(self):
+        return 'integration/machine_files/video'
+
+    def getConfigFile(self):
+        return 'config.yaml'
+
+    def test_video_stops_on_slide_removal(self):
+        # start mode1, its slide with video should come up
+        self.post_event("start_mode1")
+        self.advance_time_and_run()
+
+        self.assertEqual(self.mc.targets['default'].current_slide.name, 'mode1_slide1')
+        video_widget = self.mc.targets['default'].current_slide.children[0].children[0]
+        self.assertEqual(video_widget.state, 'play')
+
+        # stop mode 1, should unload the slide
+        self.post_event("stop_mode1")
+        self.advance_time_and_run()
+        self.assertEqual(self.mc.targets['default'].current_slide.name, 'default_blank')
+        self.assertEqual(video_widget.state, 'stop')