单元测试 newRelic.increment 指标

Question

我有一个调用 newrelic.incrementMetric() 的控制器，我想编写一个断言来检查它是否使用正确的

调用

我的控制器看起来像

const newrelic = require('newrelic')

async index() {
  // some stuff here
  newrelic.incrementMetric('hello', 1)
}

我在测试中试过这个

const newrelic = require('newrelic')

// describe block here...
  it('should call newRelic', async () => {
    newrelic.incremetentMetric = jest.fn().mockResolvedValueOnce({});
    expect (newrelic.incrementMetric).toHaveBeenCalledWith('hello', 1)
  });

执行此操作的正确方法是什么？

我的代码有错误

    Matcher error: received value must be a mock or spy function

    Received has type:  function
    Received has value: [Function incrementMetric]
    ```

Answer 1

使用 jest.mock 工厂模拟 newrelic。在测试用例中，您必须调用控制器的功能（A - 操作）。

index.ts

import newrelic from 'newrelic'

class Controller {
  index() {
    // some stuff here
    newrelic.incrementMetric('hello', 1)
  }
}

export default new Controller()

index.spec.ts

import newrelic from 'newrelic'
import controller from './index'

jest.mock('newrelic', () => {
  return {
    incrementMetric: jest.fn(),
  }
})

describe('Controller', () => {
  it('should call incrementMetric with correct', () => {
    controller.index()

    expect(newrelic.incrementMetric).toHaveBeenCalledWith('hello', 1)
  })
})

单元测试 newRelic.increment 指标

Unit Testing newRelic.increment Metric

typescript

jestjs

newrelic