@Test
  void error() {
    ReactorModelRepository repo = new ReactorModelRepository(new FakeBackend(Flux.error(new RuntimeException("boom"))));
    StepVerifier.create(repo.findAll().fetch()).verifyErrorMessage("boom");
  }
Validate the projections work with different types of facets (see {@link org.immutables.criteria.repository.Facet}).
criteria/reactor/test/org/immutables/criteria/reactor/ReactorTest.java