ThemeException exception = new ThemeException(message);

        assertNotNull(exception);
        assertEquals(message, exception.getMessage());
    }

    @Test
    public void test_veryLongMessage() {
        // Test with very long message
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 1000; i++) {
            sb.append("Long message part ").append(i).append(" ");
        }