Assertion Error

[ruxiang05]

I am getting an error when running the test for the second time:

AssertionError [ERR_ASSERTION]: zlib binding closed uitk-react-example: uitk-react-example: at Object.<anonymous>.test (test/visual.spec.js:30:23) uitk-react-example: at <anonymous> uitk-react-example: at process._tickCallback (internal/process/next_tick.js:169:7)

This is the test:

test('visual regression', async () => {
  const selector = 'a[href*="?selectedKind=Buttons&selectedStory="]';
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.goto('http://localhost:8080');

let iframe = await page.evaluate(() => {
  const iframe = document.getElementById('storybook-preview-iframe');
  return iframe.getBoundingClientRect();
});

// console.log(iframe);
let storyLinks = await page.evaluate(() => {
  const stories = Array.from(document.querySelectorAll('a[href*="?selectedKind=Example&selectedStory="]'));
  const links = stories.map(story => {
    let name = story.text.replace(/,*\s+/g, "-");
    return {href: story.href, name: name};
  });
  return links;
});

for(let i = 0; i < storyLinks.length; i++){

 await page.goto(storyLinks[i].href);
 const screen = await page.screenshot({clip: {x:iframe.x, y: iframe.y, width: iframe.width, height: iframe.height}});
 await expect(screen).toMatchImageSnapshot({customSnapshotIdentifier: storyLinks[i].name});
}

 await browser.close();

I believe it has something to do with this project. It come from this line :
await expect(screen).toMatchImageSnapshot({customSnapshotIdentifier: storyLinks[i].name});

[phawxby]

What version of jest-image-snapshot?

[anescobar1991]

Probably not the issue but await is not needed for the line using toMatchImageSnapshot() assertion.

[ruxiang05]

@phawxby 2.0.0

[phawxby]

Can you create a little sample to recreate the issue? I'm using puppeteer on Windows and I'm having no issues.

[ruxiang05]

I can't, but I tried version 1.0.1 and it worked. Is it maybe from the custom config that pixelmatch doesn't work with but blink diff did?

[anescobar1991]

@ruxiang05 I will try playing with it today and see if I can find anything but I am unable to replicate as well.

[phawxby]

I wonder if it could be system specific. What node/jest/OS version are you using?

[ruxiang05]

Node 8, Jest 21.2.1, Mac OS Sierra 10.12.6

[phawxby]

The only Mac I have access to is running High Sierra 10.13. Using Jest 21.2.1 and Node 8.6.0 no issues. Hmmmmm, the plot thickens.