private void visit(Set<String> names, String prefix, File file) {
for (File child : file.listFiles()) {
if (child.isFile()) {
names.add(prefix + child.getName());
} else if (child.isDirectory()) {
visit(names, prefix + child.getName() + "/", child);
}
}
}
private static void delete(File directory) {
for (File file : directory.listFiles()) {
if (file.isDirectory()) {
delete(file);
} else {
assertTrue(file.delete());
}
}
assertTrue(directory.delete());
}