@Override
        public void delete(String sessionId) {
            // Do nothing in test
        }

        @Override
        public void deleteAll() {
            // Do nothing in test
        }

        @Override
        public void offerAll(String sessionId, List<OpenSearchUrlQueue> list) {
            // Do nothing in test
        }

     *
     * @param form the list form containing search criteria
     * @return HTML response redirecting to the list page
     */
    @Execute
    @Secured({ ROLE, ROLE + VIEW })
    public HtmlResponse deleteall(final ListForm form) {
        validate(form, messages -> {}, this::asListHtml);
        verifyToken(this::asListHtml);
        try {
            searchHelper.deleteByQuery(request, form);

        chain.delete(user);

        assertEquals(1, chain.deleteCalls.size());
        assertEquals(user, chain.deleteCalls.get(0));
    }

    // Test delete with null user
    @Test
    public void test_delete_nullUser() {
        TestAuthenticationChain chain = new TestAuthenticationChain();

        chain.delete(null);

        assertEquals(1, chain.deleteCalls.size());
        assertNull(chain.deleteCalls.get(0));