def METHOD_NAME(self, root):
    files = {}
    for i in range(10):
        p = os.path.join(root, "file%02d" % i)
        with open(p, "wb") as fh:
            fh.write(b"file%02d" % i)
        # Need to set permissions or umask may influence testing.
        os.chmod(p, MODE_STANDARD)
        files["file%02d" % i] = p
    for i in range(10):
        files["file%02d" % (i + 10)] = GeneratedFile(b"file%02d" % (i + 10))
    return files