autotest: correctly test FENCE_AUTOENABLE=3

Tools/autotest/arduplane.py

@@ -3703,21 +3703,27 @@ def FenceAltCeilFloor(self):
         self.fly_home_land_and_disarm(timeout=150)
 
     def FenceMinAltAutoEnable(self):
-        '''Tests autoenablement of the alt min fence'''
+        '''Tests autoenablement of the alt min fence and fences on arming'''
+        fence_bit = mavutil.mavlink.MAV_SYS_STATUS_GEOFENCE
         self.set_parameters({
-            "FENCE_TYPE": 8,     # Set fence type to min alt
+            "FENCE_TYPE": 9,     # Set fence type to min alt and max alt
             "FENCE_ACTION": 1,   # Set action to RTL
             "FENCE_ALT_MIN": 25,
+            "FENCE_ALT_MAX": 100,
             "FENCE_AUTOENABLE": 3,
-            "FENCE_ENABLE" : 1,
+            "FENCE_ENABLE" : 0,
         })
 
         # Grab Home Position
         self.mav.recv_match(type='HOME_POSITION', blocking=True)
         self.homeloc = self.mav.location()
 
         self.wait_ready_to_arm()
-        self.takeoff(alt=50)
+        self.arm_vehicle()
+        # max alt fence should now be enabled
+        self.assert_fence_enabled()
+
+        self.takeoff(alt=50, mode='TAKEOFF')
         self.change_mode("FBWA")
         self.set_rc(3, 1100)    # lower throttle