Add lidar animate test, fix mock iterable.

tracking/mock_lidar.py

@@ -6,6 +6,7 @@ in the lidar_cache for testing (or anywhere else the rplidar may be used)
 
 import tracking.lidar_loader as loader
 
+
 class MockLidar:
 
     def __init__(self, scan_iter=None):
@@ -27,10 +28,16 @@ class MockLidar:
         self._iter = scan_iter
 
     def iter_scans(self, min_len=100):
-        return self._iter
+        return iter(self._iter)
 
     def get_health(self):
         return "Mock Lidar has scans" if self._iter is not None else "Mock lidar won't work properly!"
 
     def get_info(self):
         return self.get_health()
+
+    def stop(self):
+        pass
+
+    def disconnect(self):
+        pass