window.performance missing in ClientFunction

[pavelloz]

What is your Test Scenario?

I want to get window.performance object with data inside

What is the Current behavior?

Its empty

What is the Expected behavior?

Will be filled with the same data as i have inside the browser when i inspect the test using .debug()

What is your web application and your TestCafe test code?

test('timing works', async t => {
  const getLoadTime = ClientFunction(() => performance.timing);
  console.log(await getLoadTime());
});

Your website URL (or attach your complete example):
https://www.example.com

Steps to Reproduce:

Use example code above to see {} as a result instead of whats actually in the browser.

Your Environment details:

• testcafe version: 1.1.0
• node.js version: 10.13.0
• command-line arguments: npx testcafe chrome
• browser name and version: chrome 72
• platform and version: mac os 10.13.6

[AndreyBelym]

I've reproduced the problem. performance.timing stores all its properties in the prototype, not in the object. The replicator package used by TestCafe for serializing objects and transferring them from a browser to the test code doesn't support this case yet. Thus I've created a feature request in the replicator repository: inikulin/replicator#7.

As a workaround, you can use JSON.stringify/JSON.parse:

const getLoadTime = async t => JSON.parse(await t.eval(() => JSON.stringify(window.performance.timing)));

console.log(await getLoadTime(t));

[pavelloz]

Thank you :)

[rakeshkumartripathy]

Hi Guys,

I want to get window.performance.memory object with data inside in TestCafe.

This "window.performance.memory" returns memory stats in Browser Console and I am not able to get the same through TestCafe.

@AndreyBelym Can you take a look into this ?

[alexey-lin]

Hi @rakeshkumartripathy,

window.performance.memory's properties are non-enumerable, so JSON.stringify ignores them. You can adjust Andrey's sample like this:

const getMemory = async t => JSON.parse(await t.eval(() => {
	const { jsHeapSizeLimit, totalJSHeapSize, usedJSHeapSize } = window.performance.memory;
	return JSON.stringify({ jsHeapSizeLimit, totalJSHeapSize, usedJSHeapSize });
}));

[rakeshkumartripathy]

Thank you @alexey-lin

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[github-actions]

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