jasmine not working with puppeteer

问题

I'm trying to run a simple test in jasmine using puppeteer, however I can't get puppeteer to work when i use it in my test script:

const puppeteer = require('puppeteer');

describe("Jasmine puppeteer", function() {

  let browser;
  let page;

  beforeAll(() => {
    browser = await puppeteer.launch({headless: false});
    page = await browser.newPage();
    await page.goto('chrome://newtab');
    await page.screenshot({path: 'a.png'});
  })

  it("jasmine puppeteer", () => {
    expect(await page.title()).toBe("");
    done();
  });

  afterAll(() => {
  })
});

On running this script I get:

$ npm test spec/testspec.js

> test@0.0.1 test D:\sample
> jasmine "spec/testspec.js"

D:\sample\spec\testspec.js:10
    browser = await puppeteer.launch({headless: false});
                    ^^^^^^^^^

SyntaxError: Unexpected identifier
    at createScript (vm.js:80:10)
    at Object.runInThisContext (vm.js:139:10)
    at Module._compile (module.js:607:28)
    at Object.Module._extensions..js (module.js:654:10)
    at Module.load (module.js:556:32)
    at tryModuleLoad (module.js:499:12)
    at Function.Module._load (module.js:491:3)
    at Module.require (module.js:587:17)
    at require (internal/module.js:11:18)
    at D:\sample\node_modules\jasmine\lib\jasmine.js:93:5
npm ERR! Test failed.  See above for more details.

npm test simply points to jasmine. The test works fine if i comment puppeteer related code.

回答1:

await only works inside async function.

beforeAll((done) => {
    let screenshot = async function() {
        browser = await puppeteer.launch({ headless: false });
        page = await browser.newPage();
        await page.goto('chrome://newtab');
        await page.screenshot({ path: 'a.png' });
    }
    screenshot().then(done)
})

回答2:

Following the first answer I put all awaits inside async functions. However I still wasn't able to run the test script. Turns out async/await are not supported by jasmine according to this github issue, some of the comments do suggest workarounds to fix that.

Resulting in the working script:

const puppeteer = require('puppeteer');

function testAsync(specFunction) {
  return (done) => {
      specFunction().then(() => {
          done();
      }).catch((error) => {
          done.fail(error);
      });
  };
}

describe("Jasmine puppeteer", function() {

  let browser;
  let page;

  beforeAll(testAsync(async () => {
    browser = await puppeteer.launch({headless: false});
    page = await browser.newPage();
    await page.goto('https://example.com');
    await page.screenshot({path: 'a.png'});
  }));

  it("jasmine puppeteer", testAsync(async () => {
    expect(await page.title()).toBe("");
  }));

  afterAll(() => {
  })
});

回答3:

your code should be like this ‘’’ it("jasmine puppeteer",async () => { expect(await page.title()).toBe(""); done(); }); ‘’’

来源：https://stackoverflow.com/questions/48497986/jasmine-not-working-with-puppeteer

标签

node.js

jasmine

Puppeteer