public Optional<ComputationState> getIfPresent(String computationId) {
    return Optional.ofNullable(computationCache.getIfPresent(computationId));
  }
@Test
  public void testGetIfPresent_computationStateNotCached() {
    Optional<ComputationState> computationState =
        computationStateCache.getIfPresent("computationId");
    assertFalse(computationState.isPresent());
    verifyNoInteractions(configFetcher);
  }