.createTestSuite());
    suite.addTestSuite(ImmutableBiMapTest.class);

    return suite;
  }

  // Creation tests

  public void testEmptyBuilder() {
    ImmutableBiMap<String, Integer> map = new Builder<String, Integer>().build();
    assertEquals(Collections.<String, Integer>emptyMap(), map);
    assertEquals(Collections.<Integer, String>emptyMap(), map.inverse());

                CollectionFeature.ALLOWS_NULL_QUERIES)
            .createTestSuite());

    return suite;
  }

  // Creation tests

  public void testEmptyBuilder() {
    ImmutableSortedMap<String, Integer> map =
        ImmutableSortedMap.<String, Integer>naturalOrder().build();
    assertEquals(Collections.<String, Integer>emptyMap(), map);
  }