How do I get 'rake test:acceptance' to run successfully on Windows? <p>I am currently investigating using the selenium-on-rails plug-in for testing an upcoming web app that we are developing. I've written some tests, and can get them to run successfully in the test runner in the browser, however when I try to run them from the command line using 'rake test:acceptance' I see the following error:</p> <pre><code>rake aborted! fork() function is unimplemented on this machine </code></pre> <p>I have installed the win32-open3 gem and win32-process, neither of these seem to have helped. Any ideas how I can get this working?</p>