What is the best way to set up jest to generate coverage reports for Selenium tests?

I recently made the switch to using jest for testing my JavaScript project after encountering coverage issues with mocha and chai. While my unit tests are providing coverage data, my Selenium tests are not. I've tried various solutions found in outdated blogs and SO questions without success. Currently, my jest configuration in jest.config.js looks like this:

{
    collectCoverage: true,
    coverageDirectory: 'coverage',
    coverageProvider: 'babel',
    coverageReporters: [ 'html' ]
}

I am running node.js v16.13.0 on Windows with the following dependencies:

"dependencies": {
    "@babel/cli": "^7.19.3",
    "@babel/core": "^7.20.2",
    "@babel/preset-env": "^7.20.2",
    "@babel/register": "^7.18.9",
    "babel-jest": "^29.3.1",
    "babel-plugin-rewire": "^1.2.0",
    "chai": "^4.3.6",
    "eslint": "^8.9.0",
    "eslint-plugin-html": "^6.2.0",
    "eslint-plugin-json": "^3.1.0",
    "eslint-plugin-mocha": "^10.1.0",
    "express": "^4.18.2",
    "jest": "^29.3.1",
    "mocha": "^10.1.0",
    "rewire": "^6.0.0",
    "selenium-webdriver": "^4.6.0",
    "sinon": "^14.0.1"
}

I'm still struggling to get coverage information from my Selenium tests. Any suggestions on how to solve this issue?

javascriptnode.jsselenium-webdriverjestjs

Answer №1

For the past week, I've been diligently working to achieve code coverage using Jest and Selenium-webdriver, but unfortunately, I have not been successful. Determined to find a solution, I decided to take a different route by implementing an nyc reporter. Upon running the Selenium tests, I utilized JavascriptExecutor to extract the window.__coverage__ value, converted it into a string format, saved it as output.json within the nyc_output directory, and executed nyc report --reporter=lcov.

Voila! The code coverage report was finally generated.

const data = await driver.executeScript("return window.__coverage__");
fs.promises.writeFile(".nyc_output/output.json", JSON.stringify(data));

Although this method may be considered somewhat makeshift and not a sustainable solution, it serves its purpose until I am able to uncover why Jest is failing to cooperate.

I remain hopeful that someone else can provide a more efficient solution. Despite extensive research efforts, I have yet to come across any functional examples illustrating how to attain code coverage for Selenium using Jest or even Mocha and nyc.

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