Long version1 = event.getVersionNo();
        Long version2 = event.getVersionNo();
        assertEquals(version1, version2);

        String type1 = event.getEventType();
        String type2 = event.getEventType();
        assertEquals(type1, type2);

        Map<String, Object> source1 = event.toSource();
        Map<String, Object> source2 = event.toSource();
        assertSame(source1, source2);
    }

        // Test multiple instances are independent
        InvalidAccessTokenException exception1 = new InvalidAccessTokenException("Type1", "Message1");
        InvalidAccessTokenException exception2 = new InvalidAccessTokenException("Type2", "Message2");

        assertEquals("Type1", exception1.getType());
        assertEquals("Message1", exception1.getMessage());
        assertEquals("Type2", exception2.getType());