}

        final String lowerEndpoint = endpoint.toLowerCase(Locale.ROOT);

        // GCS patterns
        if (lowerEndpoint.contains("storage.googleapis.com") || lowerEndpoint.contains(".storage.cloud.google.com")) {
            return StorageType.GCS;
        }

        // S3 patterns
        if (lowerEndpoint.contains(".amazonaws.com") || lowerEndpoint.contains("s3.") || lowerEndpoint.contains("s3-")) {

    if (other.isEmpty()) {
      return other;
    } else {
      C lowerEndpoint = Ordering.<C>natural().max(this.first(), other.first());
      C upperEndpoint = Ordering.<C>natural().min(this.last(), other.last());
      return (lowerEndpoint.compareTo(upperEndpoint) <= 0)
          ? ContiguousSet.create(Range.closed(lowerEndpoint, upperEndpoint), domain)
          : new EmptyContiguousSet<C>(domain);
    }
  }

    CollectorTester.of(
            ImmutableRangeMap.<Range<Integer>, Integer, Integer>toImmutableRangeMap(
                k -> k, k -> k.lowerEndpoint()))
        .expectCollects(rangeMap, rangeOne, rangeTwo);
  }