ImmutableMap.ofEntries(entry(1, 1), entry(2, 2), entry(3, 3), entry(4, 4), entry(5, 5)),
            map(1, 1, 2, 2, 3, 3, 4, 4, 5, 5))
        .testEquals();
  }

  public void testOfEntriesNull() {
    Entry<@Nullable Integer, @Nullable Integer> nullKey = entry(null, 23);
    assertThrows(
        NullPointerException.class,
        () -> ImmutableMap.ofEntries((Entry<Integer, Integer>) nullKey));