/**
     * The search page.
     * @param form The search form.
     * @return The HTML response.
     */
    @Execute
    public HtmlResponse search(final SearchForm form) {
        if (viewHelper.isUseSession()) {
            LaRequestUtil.getOptionalRequest().ifPresent(request -> {
                final HttpSession session = request.getSession(false);
                if (session != null && form.num != null) {

        ViewHelper viewHelper = new ViewHelper();
        viewHelper.init();

        viewHelper.setUseSession(false);
        assertFalse(viewHelper.isUseSession());

        viewHelper.setUseSession(true);
        assertTrue(viewHelper.isUseSession());

        viewHelper.addInitFacetParam("key1", "value1");
        assertEquals("key1", viewHelper.getInitFacetParamMap().get("value1"));