@Test
public void testEmptyClaims() throws Exception {

    Signer signer = new Signer("secret".getBytes());
    Rfc7519Claims claims = new Rfc7519Claims();
    String jwt = signer.sign(claims);
    assertEquals(
            "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.e30.DMCAvRgzrcf5w0Z879BsqzcrnDFKBY_GN6c3qKOUFtQ",
            jwt);
}