@CanIgnoreReturnValue
  public PathSubject doesNotExist() {
    if (!Files.notExists(actual, linkOptions)) {
      failWithActual(simpleFact("expected not to exist"));
    }
    if (Files.exists(actual, linkOptions)) {
      failWithActual(simpleFact("expected not to exist"));
    }
    return this;
  }
Asserts that the path does not exist.
jimfs/src/test/java/com/google/common/jimfs/PathSubject.java