节点：279853MaxListenersExceededWarning：检测到可能的 EventEmitter 内存泄漏

如何解决节点：279853MaxListenersExceededWarning：检测到可能的 EventEmitter 内存泄漏

当我使用 Mocha 测试我的 js 文件时总是收到警告。

（节点：279853）MaxListenersExceededWarning：检测到可能的 EventEmitter 内存泄漏。 11 个数据监听器添加到 [l]。使用emitter.setMaxListeners()增加限制

请帮我解决这个警告 这也是我的代码

const assert = require('assert');
const ganache = require('ganache-cli');
const Web3 = require('web3');
const web3 = new Web3(ganache.provider());

const CompiledFactory = require('../ethereum/build/factory_campaign.json');
const CompiledCampaign = require('../ethereum/build/Campaign.json');

let accounts;
let factory;
let campaignAddress;
let campaign;

beforeEach(async ()=>{

    accounts = await web3.eth.getAccounts();

    factory = await new web3.eth.Contract(JSON.parse(CompiledFactory.interface))
        .deploy({data: CompiledFactory.bytecode})
        .send({from: accounts[0],gas:'1000000'});

    
    await factory.methods.create_campain('9999999999').send({
        from: accounts[0],gas:1000000
    });

    const address = await factory.methods.getContract().call();
    campaignAddress = address[0];

    campaign = await new web3.eth.Contract(JSON.parse(CompiledCampaign.interface),campaignAddress);

});

describe('Factory and Campaign...',() =>{
    it('deploy a contract for Campaign and Factory',()=>{
        assert.ok(factory.options.address);
        assert.ok(campaign.options.address);
    });
});