Before you can begin with testing your application, you need to install the required packages. In this case phantom.js and casper.js.
You can download the most stable release at http://phantomjs.org/download.html. Download and extract it on your webserver. For example you can extract it in /opt.
your@machine:/opt/phantomjs-1.9.2-linux-x86_64$ ls
bin ChangeLog examples LICENSE.BSD README.md
your@machine:/opt/phantomjs-1.9.2-linux-x86_64$
After that, ensure that a proper symbolic link is set in /usr/bin (or any other directory of your choice)
your@machine:/usr/bin$ln -s /opt/phantomjs-1.9.2-linux-x86_64/bin/phantomjs
CasperJS works on top of PhantomJS, so there is no need to include it as a JavaScript-Resource. Instead you can call casperjs directly as a binary. Download the most stable release at http://casperjs.org/ and extract it on your webserver. Follow the same steps as for PhantomJS and create a symbolic link at /usr/bin.
Running a casperjs testing script is very easy. Write a script.
Look the README!