Maven isn't a code coverage tool. You could just install emma for code coverage. In fact, using Maven for code coverage is overkill because you need to completely change your project structure and dependency list.
Tim: Maven does not come in RAD as of 7.5. You need to install =http://www.sonatype.org/m2eclipse/M2Eclipse to get it. Incidentally, it only comes with Eclipse if you choose the Java version. The JEE version does not.