@Test
public void testSearchForFilesWhenSearchedTextIsNull() throws IOException {

    //GIVEN
    //WHEN
    underTest.searchForFiles(null, session);
    //THEN
    verify(luceneEngine).search(null);
    verify(fileChecker).checkFilesExistsWithPairs(lucineResult);
    verify(session).setAttribute("searchResult", listOfLists);
}