Selenium error

WebDriverException: unknown error: cannot find Chrome binary

Selenium's ChromeDriver can't locate an actual Chrome (or Chromium) executable on this machine.

Why this happens

Chrome isn't installed on the machine/CI image running the test
Chrome is installed in a non-standard location the driver doesn't check by default

How to fix it

Install Chrome (or Chromium) on the runner, or use a CI image that already bundles it
If it's in a custom location, set the binary path explicitly: `ChromeOptions options = new ChromeOptions(); options.setBinary("/path/to/chrome");`