/** Test that comparator is defined. */
public static void testGetComparator() throws Exception {
assert (WritableComparator.get(Frob.class) instanceof FrobComparator);
}
static { // register this comparator
WritableComparator.define(NullWritable.class, new Comparator());
}
static { // register default comparator
WritableComparator.define(Frob.class, new FrobComparator());
}