Mockito - Trigger mocked method when passed list of certain parameters

Consider following stub :

class InformationProvider{ private FileAccessor; //custom interface, works like readable DAO, but on files. public List<Information> getInformation (Collection<String> identifiers){ List<Information> infoList = getInformationFromMemory(identifiers); List<String> remaining = getListofIdsNotInMemory(identifiers, infoList); //looks up which IDs need to be searched in files. infoList.addAll(fileAccessor.getInformation(remaining)); return infoList; } } 

I am writing a unit test for the provider. My idea was like following:

class InformationProviderTest{ InformationProvider infoprovider = new InformationProvider(); List<String> idsMemory = Arrays.asList("AAA", "BBB"); List<String> idsFile = Arrays.asList("CCC", "DDD"); @Mock FileAccessor fa; @Before public void setUp(){ //All the necessary mock initialization and constructors and stuff infoprovider.setFileAccessor(fa); } @Test public void correctDataAllocationTest(){ List<Information> requiredResult = buildInformation("AAA","BBB","CCC","DDD"); //Prepares Information objects for IDs "AAA","BBB","CCC" and "DDD" List<Information> infoFromFile = buildInformation("CCC","DDD"); Mockito.when(fa.getInformation(idsFile)).thenReturn(infoFromFile); infoProvider.getInformation(Arrays.asList("AAA","BBB","CCC","DDD")); //Asserts and stuff } 

In my case, the method fa.getInformation is never called with List idsFile, because the actual list used as a parameter is created new inside the InformationProvider. Both lists do contain the same strings though, "CCC" and "DDD".

How do I make Mockito to match them? All the tutorials I found were dealing only with either objects or used anyList(). Using anyList() actually does the matching, but then loses the information about the IDs. I need to be sure that when called with other IDs, this method returns nothing, something along the lines of (afaik non-existing) "anyListContaining(<Collection>)".

I am also limited to using Mockito library.