assertEquals(1, getMap().size());
  }

  // nb: inverse is run through its own entire suite

  @MapFeature.Require(SUPPORTS_PUT)
  @CollectionSize.Require(ZERO)
  public void testInversePut() {
    getMap().put(k0(), v0());
    getMap().inverse().put(v1(), k1());
    expectAdded(e0(), e1());
  }