public void ShouldShowStatementHistory()
        {
            var s1 = new Statement(customer);
            var s2 = new Statement(customer);

            repository.Add(s1);
            repository.Add(s2);

            ViewResult result = controller.Index();

            Assert.That(result.Model, Contains.Item(s1));
            Assert.That(result.Model, Contains.Item(s2));
        }