Question

我能够轻松地使用玩笑来模拟模块，例如：

import * as PubNub from 'pubnub';

jest.mock('pubnub', () =>
  jest.fn().mockImplementation(() => {
    mockPubnubInstance = {
      addListener(options) {
        mockPubnubListener(options);
      },
      publish() {
        return Promise.resolve({});
      },
      subscribe: jest.fn(),
      history(params, callback) {
        return mockHistory(params, callback);
      },
    };

    return mockPubnubInstance;
  }),
);

我如何在赛普拉斯中做到这一点？

cy.stub('pubnub', 'publish').returns(Promise.resolve({}))

我尝试查看Cypress存根，但似乎不起作用。

Answer 1

赛普拉斯内部使用(D*) (void*) (B*) d (B*) (void*) d作为其存根和间谍库。这是单元测试解决方案：

sinon：

index.ts

import PubNub from 'pubnub'; export const pubnub = new PubNub({ publishKey: 'demo', subscribeKey: 'demo' }); export function publish() { function publishSampleMessage() { console.log("Since we're publishing on subscribe connectEvent, we're sure we'll receive the following publish."); var publishConfig = { channel: 'hello_world', message: { title: 'greeting', description: 'hello world!' } }; pubnub.publish(publishConfig, function(status, response) { console.log(status, response); }); } pubnub.addListener({ status: function(statusEvent) { if (statusEvent.category === 'PNConnectedCategory') { publishSampleMessage(); } }, message: function(msg) { console.log(msg.message.title); console.log(msg.message.description); }, presence: function(presenceEvent) { // handle presence } }); console.log('Subscribing..'); pubnub.subscribe({ channels: ['hello_world'] }); }：

index.spec.ts

单元测试结果：

/// <reference types="Cypress" />

import { publish, pubnub } from './';

describe('59170422', () => {
  it('should pass', () => {
    const logSpy = cy.spy(console, 'log');
    const addListenerStub = cy.stub(pubnub, 'addListener');
    const publishStub = cy.stub(pubnub, 'publish').resolves({});
    const subscribeStub = cy.stub(pubnub, 'subscribe');
    publish();
    addListenerStub.yieldTo('status', { category: 'PNConnectedCategory' });
    expect(addListenerStub).to.have.been.calledOnce;
    expect(publishStub).to.have.been.calledOnce;
    expect(subscribeStub).to.have.been.calledOnce;
    publishStub.yield(200, 'haha');
    expect(logSpy).to.have.been.calledWith(200, 'haha');
    addListenerStub.yieldTo('message', { message: { title: 'I am title', description: 'I am description' } });
    expect(logSpy).to.have.been.calledWith('I am title');
    expect(logSpy).to.have.been.calledWith('I am description');
  });
});

源代码：https://github.com/mrdulin/cypress-codebase/tree/master/cypress/integration/stackoverflow/59170422

如何在赛普拉斯中存根节点模块？

1 个答案: