### Question:
PendingResultsHolder { public PendingResult get(final String id) { return pendingResults.get(id); }  String create(); void remove(final String id); PendingResult get(final String id);  }### Answer:
@Test public void shouldNotReturnPendingResult_withUnknownId() { final String id = randomId(); final PendingResult pendingResult = pendingResultsHolder.get(id); assertNull(pendingResult); }