assertEquals(1, getMap().size());
    assertTrue(getMap().containsKey(k0()));
  }

  @MapFeature.Require(SUPPORTS_PUT)
  @CollectionSize.Require(ONE)
  public void testForcePutValuePresent() {
    getMap().forcePut(k1(), v0());
    expectContents(mapEntry(k1(), v0()));
    assertEquals(k1(), getMap().inverse().get(v0()));
    assertEquals(1, getMap().size());