Overridden to validate the 'destinationFile' attribute. This attribute
must include a '{0}', which serves as a place holder for the JUnit
test name.
super.validateOptions();
if (getDestinationFile().indexOf("{0}") == -1) {
throw new XDocletException(
"The '" + getSubTaskName() +
"' Ant Doclet Subtask attribute 'destinationFile' " +
"must contain the substring '{0}', which serves as a " +
"place holder JUnit Test name.");
}