protected static PathSubject assertThatPath(Path path, LinkOption... options) {
    PathSubject subject = assert_().about(paths()).that(path);
    if (options.length != 0) {
      subject = subject.noFollowLinks();
    }
    return subject;
  }
Creates the file system to use in the tests.
jimfs/src/test/java/com/google/common/jimfs/AbstractJimfsIntegrationTest.java