// Standard Base64 with padding
        final byte[] result = authenticator.decodeBase64("dGVzdA==");
        assertEquals("test", new String(result));
    }

    @Test
    public void test_parseJwtClaim_simpleValues() throws IOException {
        final String jwtClaim = "{\"sub\":\"user123\",\"name\":\"John Doe\",\"email\":\"******@****.***\"}";
        final Map<String, Object> attributes = new HashMap<>();