Class not found "org.apache.commons.validator.ValidatorTestSuite"

When running the tests, the class "org.apache.commons.validator.ValidatorTestSuite" is not found; compile.tests was run succesfully.

`grep -ri suite` and `find . -name '*suite*'` in the project's directory yield nothing of interest, before and after compilation; only:

build.xml: <arg value="org.apache.commons.validator.ValidatorTestSuite"/>
build.xml: <arg value="org.apache.commons.validator.routines.checkdigit.CheckDigitTestSuite"/>
build.xml: <arg value="org.apache.commons.validator.routines.RoutinesTestSuite"/>
checkstyle.xml: We feel this implementation is well suited as a warning,

So, where has the test suite gone to?