public Object[][] duplicatesData() { Rankable A1 = new RankableObjectWithFields("A", 1); Rankable A2 = new RankableObjectWithFields("A", 2); Rankable A3 = new RankableObjectWithFields("A", 3); return new Object[][]{ { Lists.newArrayList(ANY_RANKABLE, ANY_RANKABLE, ANY_RANKABLE) }, { Lists.newArrayList(A1, A2, A3) }, }; }