1.问题

当我试图在vscode中使用mocha-debug进行调试的时候，就会发现一段时间在命令行中就会报错，报错信息如下

Assertion failed: (object->InternalFieldCount() > 0), function Unwrap, file ../node_modules/nan/nan_object_wrap.h, line 33.

2.相关代码

• 测试文件

'use strict';
const { rootPath, testConfig, testLogger, wait } = _testHelper;
const Canvas = require('canvas');
const co = require('co');
const should = require('should');
const picFunc = require(`${rootPath}/utils/text2pic`);
const Image = Canvas.Image;


describe('小黄图生成图片测试', () => {

  it('测试生成图片方法', () => {
    return co(function*(){
      let testLogger = {
        info: console.log.bind(null)
      };
      let mPic = picFunc(testLogger, testConfig);

      let novelList = require('./data.json').novels;
      let novel = novelList[1];
      novel.qrcodeUrl = `${rootPath}/img-dirs/yellow-pic/qrcodes/1.png`;
      // let qrcodeImg = new Image(`${rootPath}/img-dirs/img-tpls/common/0 二胎政策创始人.jpg`);
      let qrcodeImg = new Image(novel.qrcodeUrl);
      novel.username = '谷阿莫';
      let path = yield mPic.toPic(novel);
      console.log(path);
    });
  });

• mocha命令

 "mocha-debug": "NODE_ENV=test mocha tests/utils/text2pic/test.js -r ./tests/helper.js -R spec --debug-brk",

3.重现过程：

• 随意打若干断点

• 使用npm run mocha-debug命令后，在vscode中启动单元测试执行

• 报错信息出现，查了一下核心模块nan_object_wrap.h代码如下：

  template 
  static inline T* Unwrap(v8::Local object) {
    assert(!object.IsEmpty());
    assert(object->InternalFieldCount() > 0);
    // Cast to ObjectWrap before casting to T.  A direct cast from void
    // to T won't work right when T has more than one base class.
    void* ptr = GetInternalFieldPointer(object, 0);
    ObjectWrap* wrap = static_cast(ptr);
    return static_cast(wrap);
  }

4.已经尝试的解决方案

• 更换图片地址

• 将有关picFunc图片处理函数的代码段全部注释掉

• Google查询