Selenium allows you to run your test in a real browser, like Firefox.
Today, we can't automatically start selenium-server before tests and stop it after. You should manually start it:
java -jar where/is/selenium-server-xx.jar
Just add the following dependency to your pom:
...
<dependencies>
...
<dependency>
<groupId>net.sourceforge.jwebunit</groupId>
<artifactId>jwebunit-selenium-plugin</artifactId>
<version>1.3-SNAPSHOT</version>
</dependency>
...
</dependencies>
...