@Test
  public void testSaveStore() {
    SimulationStorePdo store = new SimulationStorePdo();
    store.addSimulation(new SimulationPdo());
    em.saveSimulationStore(store);

    SimulationStorePdo managerStore = em.getSimulationStore();
    assertEquals(store, managerStore);
    assertEquals(1, managerStore.getSimulations().size());
  }
  @Test
  public void testSaveAndLoadStore() {
    SimulationStorePdo store = new SimulationStorePdo();
    store.addSimulation(new SimulationPdo());
    em.saveSimulationStore(store);

    SimulationStoreManager em2 = new SimulationStoreManager();
    em2.initializePersistence();

    SimulationStorePdo managerStore = em2.getSimulationStore();
    assertEquals(1, managerStore.getSimulations().size());
  }