Evaluation failed: ReferenceError: cov_77g31rban is not defined in Jest Puppeteer test

Question

I'm using the code in several projects and it works fine:

await page.$eval("input[id*='virtual_course']", elem => elem.click())

Except in one project, I get the following error:

Error: Evaluation failed: ReferenceError: cov_77g31rban is not defined
    at __puppeteer_evaluation_script__:3:7

I'm using the same version of all libraries and all projects so not sure why there would be the difference?

Hard to say without the site. Every site is different and there are no silver bullets. Just because something works on one site doesn't mean it'll work on others. `cov_77g31rban` seems totally unrelated to your code, for starters. — ggorlen, Jan 02 '23 at 05:35
Here's some more information. I noticed that the error only seems to happen when I'm running the function as a test using Jest. The error happens with every instance of $eval. It's also happening with this line: const test = await page.$eval(`#courseID`, el => el.textContent.trim()) Here's the error Error: Evaluation failed: ReferenceError: cov_77g31rban is not defined at __puppeteer_evaluation_script__:3:7 at ExecutionContext._evaluateInternal (/Users/et/src/WebstormProjects/sal/node_modules/puppeteer/src/common/ExecutionContext.ts:273:13) — Coderdude, Jan 02 '23 at 16:04

score 0 · Answer 1 · edited Jan 02 '23 at 17:04

0

Once I realized that running through Jest was the culprit, I found this thread which fixed the problem.

In Puppeteer, while running tests, istanbul was inserting the following:

/* istanbul ignore next */cov_4kq3tptqc.f[7]++;
                   cov_4kq3tptqc.s[19]++;

This was fixed by adding config.collectCoverage = false; to the jest.config.

edited Jan 02 '23 at 17:04

ggorlen

answered Jan 02 '23 at 16:21

Coderdude

1 Answers1