@Test
public void testContainsAll() {

    expect(extractor.getValue("one")).andReturn(1);
    expect(extractor.getValue("two")).andReturn(1);
    replay(extractor);
    List<String> coll = new ArrayList<String>();
    coll.add("one");
    coll.add("two");
    assertTrue(entrySet.containsAll(coll));
    verify(extractor);
}