@Test
  public void testIndexWhenObjectNotInSetWhenPopulated() {
    int numEntries = 10;
    setupHashIndexSet(numEntries);
    assertEquals(-1, his.index(new Portfolio(numEntries + 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