@Test
  public void testIndexWhenObjectNotInSet() {
    int numEntries = 10;
    his = createHashIndexSet();
    portfoliosMap = createPortfolioObjects(numEntries, 0);
    assertEquals(-1, his.index(portfoliosMap.get(1)));
  }
Add multiple portfolios with the same id they should collide, we should then be able to look up
each one correctly
geode-core/src/test/java/org/apache/geode/cache/query/internal/index/HashIndexSetJUnitTest.java