Provide a way to launch different versions of Firefox

[pantosha]

We need to test site in different versions of Firefox in parallel.
So it will be nice to provide an option to configure path to Firefox executables.

Possible way to implement is extending of args for customLaunchers.

customLaunchers: {
    Firefox68: {
        base: 'FirefoxHeadless',
        name: 'Firefox68',
        command: '<path to FF68>/firefox.exe'
    },
    Firefox78: {
        base: 'FirefoxHeadless',
        name: 'Firefox78',
        command: '<path to FF78>/firefox.exe'
    }
}

[birtles]

I'm just curious, is there a reason to prefer this over triggering the test suite several times using the environment variables?

FIREFOX_BIN=<path to FF68>/firefox.exe yarn test
FIREFOX_BIN=<path to FF72>/firefox.exe yarn test

The patch seems good but I'm just curious about the use case.

[pantosha]

@birtles we have a big bunch of tests and we want to run tests in parallel (see karma concurrency option: http://karma-runner.github.io/5.2/config/configuration-file.html). Environment variables can't help us in that case.

[birtles]

Thanks. That makes sense.

[karmarunnerbot]

🎉 This issue has been resolved in version 2.1.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

Your semantic-release bot 📦🚀