}

  // TODO(b/172823566): Use mainline testToImmutableSortedSet_customComparator once CollectorTester
  //  is usable to java7.
  public void testToImmutableSortedSet_customComparator_java7() {
    // Note that a Collector should generally enforce consistent comparator between builders.
    // So no tests for non-matching comparator shenanigans.
    ImmutableSortedSet.Builder<String> zis =