Update test_cover.py

Author: jeverley

tests/test_cover.py

@@ -289,9 +289,9 @@ async def test_cover(
     )
     assert entity.state["state"] == CoverState.OPEN
 
-    # test entity async_update
+    # test entity async_update read of positions from the cluster
     cluster.PLUGGED_ATTR_READS[WCAttrs.current_position_lift_percentage.name] = 0
-    cluster.PLUGGED_ATTR_READS[WCAttrs.current_position_tilt_percentage.name] = 0
+    cluster.PLUGGED_ATTR_READS[WCAttrs.current_position_tilt_percentage.name] = 100
     update_attribute_cache(cluster)
     await entity.async_update()
     await zha_gateway.async_block_till_done()