public void only_calls_ensure_storage_exists_on_first_call()
{
var options = new StoreOptions();
var inner = new ProviderGraph(options);
var storage = Substitute.For <IMartenDatabase>();
var graph = new StorageCheckingProviderGraph(storage, inner);
var userPersistence = graph.StorageFor <User>();
var userPersistence2 = graph.StorageFor <User>();
var userPersistence3 = graph.StorageFor <User>();
storage.Received(1).EnsureStorageExists(typeof(User));
userPersistence.ShouldBeSameAs(userPersistence2);
userPersistence.ShouldBeSameAs(userPersistence3);
}
