  @Test
  public void testOrs() {

    DocIdSetCardinality c;
    c = new DocIdSetCardinality(0.1, 0.2);
    c.orWith(new DocIdSetCardinality(0.1, 0.2));
    DocSetAssertions.assertRange(0.1, 0.4, c);

    c = new DocIdSetCardinality(0.8, 0.9);
    c.orWith(new DocIdSetCardinality(0.8, 0.9));
    DocSetAssertions.assertRange(0.8, 1.0, c);
  }