public void All() {
ResourceCollection<Customer> collection = gateway.Customer.All();
Assert.IsTrue(collection.MaximumCount > 100);
List<string> items = new List<string>();
foreach (Customer item in collection) {
items.Add(item.Id);
}
HashSet<string> uniqueItems = new HashSet<string>(items);
Assert.AreEqual(uniqueItems.Count, collection.MaximumCount);
}