Sample unit test function for UserAuth.java

UserAuthTest.java

    @Test
    public void testJWT() throws Exception {
        Calendar now = Calendar.getInstance();
        now.add(Calendar.SECOND, 20);
        
        JsonObject obj = Json.object();
        obj.add("sub", "1234567890");
        obj.add("name", "John Doe");
        obj.add("admin", true);
        obj.add("exp", now.getTimeInMillis());
        
        String user_data = obj.toString();
        String token = UserAuth.generateToken(user_data);
        
        JsonObject result = UserAuth.validateToken(token);
        assertTrue("Verify Token: ", result.getBoolean("verified", false));
        JsonObject payload = result.get("payload").asObject();
        assertEquals("Verify Name: ", payload.getString("name", ""), "John Doe");
        System.out.println("Expired? " + result.getBoolean("expired", false));
    }