@Test
public void testGetClientId() {

    Auth0Jwt jwt;
    jwt  = new Auth0Jwt(parser.parseClaimsJws(Jwts.builder().setSubject("subject").signWith(secretKey).compact()));
    assertNull(jwt.getClientId());
    jwt = new Auth0Jwt(parser.parseClaimsJws(Jwts.builder().claim("https://myapp.example.com/client_id", "client_id").signWith(secretKey).compact()));
    assertEquals(jwt.getClientId(), "client_id");
}