Test plugin for https://github.com/NukkitX/Nukkit/issues/1126

plugin.yml

name: OffhandTestPlugin
main: sample.OffhandTestPlugin
version: 1.0.0
api: ["1.0.9"]

commands:
  test-offhand:
    permission: test-offhand
permissions:
  test-offhand:
    default: true

sample.OffhandTestPlugin.java

package sample;

import cn.nukkit.Player;
import cn.nukkit.command.Command;
import cn.nukkit.command.CommandSender;
import cn.nukkit.plugin.PluginBase;

public class OffhandTestPlugin extends PluginBase {
    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        Player player = (Player) sender;
        sender.sendMessage("You have this in your offhand: "+player.getOffhandInventory().getItem(0).getName());
        player.getInventory().clearAll();
        return true;
    }
}