Collection<@Nullable Integer> c = MinimalCollection.of(1, 3, null, 2);
    assertThrows(
        NullPointerException.class, () -> ImmutableList.sortedCopyOf((Collection<Integer>) c));
  }

  public void testSortedCopyOf() {
    Collection<String> c = MinimalCollection.of("a", "b", "A", "c");
    List<String> list = ImmutableList.sortedCopyOf(String.CASE_INSENSITIVE_ORDER, c);
    assertEquals(asList("a", "A", "b", "c"), list);
  }

    Collection<@Nullable Integer> c = MinimalCollection.of(1, 3, null, 2);
    assertThrows(
        NullPointerException.class, () -> ImmutableList.sortedCopyOf((Collection<Integer>) c));
  }

  public void testSortedCopyOf() {
    Collection<String> c = MinimalCollection.of("a", "b", "A", "c");
    List<String> list = ImmutableList.sortedCopyOf(String.CASE_INSENSITIVE_ORDER, c);
    assertEquals(asList("a", "A", "b", "c"), list);
  }