The source for the org.drools.DroolsTestCase class appears in the drools-core, drools-io, and drools-smf sub-directories. The one in drools-core was recently updated, but the duplicates in drools-io and drools-smf were not updated to match.
This causes the Ant build (via build.xml) to fail since it relies on copying the source from all the sub-directories into one location for compilation. The out-dated versions of DroolsTestCase are overwriting the updated version and this causes the Ant build to fail.
Someone should either update the two other classes to be like the first, or remove this duplicate code altogether.