@Test(expected = IllegalArgumentException.class) public void putKeyWithWhitespaces2Test() { List<Object> valuesToPut = new ArrayList<>(); valuesToPut.add(1); valuesToPut.add(2); valuesToPut.add(3); Storeable needToPut = tableProvider.createFor(testTableEng, valuesToPut); testTableEng.put(" key ", needToPut); }