// Should not throw any exception
        webApiFilter.destroy();
        assertTrue(true);
    }

    // Test doFilter when WebApiManagerFactory returns null WebApiManager
    public void test_doFilter_withNullWebApiManager() throws IOException, ServletException {
        // Setup mock objects
        HttpServletRequest request = createMockHttpServletRequest();
        HttpServletResponse response = createMockHttpServletResponse();