assertThrows(NullPointerException.class, () -> ImmutableBiMap.of("one", 1, "two", null));
  }

  @SuppressWarnings({"AlwaysThrows", "DistinctVarargsChecker"})
  public void testOfWithDuplicateKey() {
    IllegalArgumentException expected =
        assertThrows(IllegalArgumentException.class, () -> ImmutableBiMap.of("one", 1, "one", 1));

    Cut<Integer> e = Range.greaterThan(1).lowerBound;
    Cut<Integer> f = Range.greaterThan(1).upperBound;

    testCompareToAndEquals(ImmutableList.of(a, b, c, d, e, f));
  }

  @SuppressWarnings("DistinctVarargsChecker")
  public void testContainsAll() {
    Range<Integer> range = Range.closed(3, 5);
    assertTrue(range.containsAll(asList(3, 3, 4, 5)));
    assertFalse(range.containsAll(asList(3, 3, 4, 5, 6)));

    List<Integer> list = asList(0, 3, 5, 6, 7, 8, 9);
    sort(list, c);
    assertThat(list).containsExactly(8, 6, 7, 5, 3, 0, 9).inOrder();
    reserializeAndAssert(c);
  }

  @SuppressWarnings("DistinctVarargsChecker") // test of buggy call
  public void testExplicit_withDuplicates() {
    assertThrows(IllegalArgumentException.class, () -> Ordering.explicit(1, 2, 3, 4, 2));
  }

    List<Integer> list = asList(0, 3, 5, 6, 7, 8, 9);
    sort(list, c);
    assertThat(list).containsExactly(8, 6, 7, 5, 3, 0, 9).inOrder();
    reserializeAndAssert(c);
  }

  @SuppressWarnings("DistinctVarargsChecker") // test of buggy call
  public void testExplicit_withDuplicates() {
    assertThrows(IllegalArgumentException.class, () -> Ordering.explicit(1, 2, 3, 4, 2));
  }