Directly call DummyStage instance during movement test for speed

tests/mock_things/mock_cancel.py

@@ -0,0 +1,19 @@
+"""Create a fake CancelHook used instead of a dependency, it cannot be used to cancel!
+
+Certain actions require a CancelHook to be supplied if called directly. The only method
+we use from the LabThings CancelHook is ``sleep()``. The CanceHook ``sleep()`` works
+exactly like ``time.sleep()`` except with raise an ``InvocationCancelledError`` if the
+server receives a cancellation request.
+
+This is just an object with a sleep method.
+"""
+
+import time
+
+
+class MockCancel:
+    """A class to use when directly calling an action with CancelHook dependency."""
+
+    def sleep(self, time_in_seconds: float):
+        """Sleep for the input number of seconds."""
+        time.sleep(time_in_seconds)