private static ReactiveFetcher<String> create(String ... values) {
    FakeBackend backend = new FakeBackend(Flowable.fromArray(values));
    return ReactiveFetcherDelegate.of(Query.of(TypeHolder.StringHolder.class), backend.open(TypeHolder.StringHolder.class));
  }
Check that correct exceptions are thrown by {@link ReactiveFetcher}
criteria/common/test/org/immutables/criteria/repository/reactive/ReactiveFetcherDelegateTest.java