assertEquals(level3, exception.getCause().getCause().getCause());
        assertEquals("Null value", exception.getCause().getCause().getCause().getMessage());
    }

    @Test
    public void test_toStringMethod() {
        // Test toString method behavior
        String message = "Plugin toString test";
        PluginException exception = new PluginException(message);

        String toStringResult = exception.toString();