public async Task GetAll_ShouldReturnValidCount()
{
var rents = await RentsService.GetAll(null);
Assert.That(rents.Count(), Is.EqualTo(Rents.Count));
foreach (var rent in Rents)
{
Assert.That(rent.Count, Is.Not.EqualTo(0));
Assert.That(rent.Subscriber, Is.Not.Null);
Assert.That(rent.Book, Is.Not.Null);
}
}