autotest: add test for partial-transfer after mission-upload

Tools/autotest/rover.py

@@ -6749,6 +6749,35 @@ Brakes have negligible effect (with=%0.2fm without=%0.2fm delta=%0.2fm)
         shutil.copy('build/sitl/bin/ardurover.noppp', 'build/sitl/bin/ardurover')
         self.reboot_sitl()
 
+    def FenceFullAndPartialTransfer(self, target_system=1, target_component=1):
+        '''ensure starting a fence transfer then a partial transfer behaves
+        appropriately'''
+        # start uploading a 10 item list:
+        self.mav.mav.mission_count_send(
+            target_system,
+            target_component,
+            10,
+            mavutil.mavlink.MAV_MISSION_TYPE_FENCE
+        )
+        self.assert_receive_mission_item_request(mavutil.mavlink.MAV_MISSION_TYPE_FENCE, 0)
+        # change our mind and try a partial mission upload:
+        self.mav.mav.mission_write_partial_list_send(
+            target_system,
+            target_component,
+            3,
+            3,
+            mavutil.mavlink.MAV_MISSION_TYPE_FENCE)
+        # should get denied for that one:
+        self.assert_receive_mission_ack(
+            mavutil.mavlink.MAV_MISSION_TYPE_FENCE,
+            want_type=mavutil.mavlink.MAV_MISSION_DENIED,
+        )
+        # now wait for the original upload to be "cancelled"
+        self.assert_receive_mission_ack(
+            mavutil.mavlink.MAV_MISSION_TYPE_FENCE,
+            want_type=mavutil.mavlink.MAV_MISSION_OPERATION_CANCELLED,
+        )
+
     def MissionRetransfer(self, target_system=1, target_component=1):
         '''torture-test with MISSION_COUNT'''
 #        self.send_debug_trap()
@@ -6870,6 +6899,7 @@ Brakes have negligible effect (with=%0.2fm without=%0.2fm delta=%0.2fm)
             self.NetworkingWebServerPPP,
             self.RTL_SPEED,
             self.MissionRetransfer,
+            self.FenceFullAndPartialTransfer,
         ])
         return ret