private Class<?>[] findIntegrationTestClasses()
    throws ClassNotFoundException, LinkageError, IOException {
    ClassTestFinder.TestFileNameFilter nameFilter = new ClassTestFinder.TestFileNameFilter();
    ClassFinder classFinder = new ClassFinder(nameFilter, nameFilter, intTestFilter);
    Set<Class<?>> classes = classFinder.findClasses(true);
    return classes.toArray(new Class<?>[classes.size()]);
  }
Returns test classes annotated with @Category(IntegrationTests.class), according to the filter
specific on the command line (if any).
hbase-it/src/test/java/org/apache/hadoop/hbase/IntegrationTestsDriver.java