@Override
            public boolean accept(Path entry) throws IOException {
                String fileName = entry.getFileName().toString();
                return (
                    (fileName.endsWith(".class") && (fileName.contains("Test")) && !fileName.contains("$")) ||
                    (!fileName.startsWith(".") && Files.isDirectory(entry))
                );
            }
@return FileFilter for searching class files (no inner classes, only
        those with "Test" in the name)
jme3-examples/src/main/java/jme3test/TestChooser.java