监视 bunyan 日志 - NodeJS

Question

有什么方法可以监视 bunyan 日志以确保打印出我期望的内容？

我的文件

const bunyan = require('bunyan');
const log = bunyan.createLogger({name: 'FailureAuditService'});

class someClass {
   someFunct() {
     if(x) {
        log.warn('something happened');
     }
   }
}

测试

const service = require(../MyFile);

describe('test something', () => {
    it('Will test the bunyan log', res => {
       let consoleLog = sinon.spy(log, 'createLogger');
       let x = true;

       service.someClass(x).then(res => {
          let expected = 'something happened';
          consoleLog.should.equal(expected);
       });
    });
})

Answer 1

是的，使用Jest很容易：

let spyLogWarn = jest.spyOn(require('bunyan').prototype, 'warn')
// ...
expect(spyLogWarn).toHaveBeenCalled()