Should be a task to clean out stale test module JARs--i.e. XXXXXNNNNN-test.jar
where XXXXX.jar is the JAR built by the build script and there is a newer test
JAR. So for example in apisupport/build.xml's clean:

<cleanstaletestjars>
    <fileset dir="test">
        <include name="apisupport.jar"/>
        <include name="apisupport-ant.jar"/>
        <include name="apisupport-lite.jar"/>
    </fileset>
</cleanstaletestjars>

This would remove any apisupportNNNNN-test.jar, apisupport-antNNNNN-test.jar, or
apisupport-liteNNNNN-test.jar which was not the newest of its category (leave
the basic JAR and the newest test JAR in case they are still in use by a running
IDE). Otherwise the clean target does not remove sometimes dozens of potentially
large JARs which is annoying and wastes disk space.