public void setBlocked_UpdatesBlockedValue()
        {
            var expected = true;

            cc.SetBlocked(expected);
            FieldInfo fi     = typeof(CreditCard).GetField("_blocked", BindingFlags.Instance | BindingFlags.NonPublic);
            var       actual = fi.GetValue(cc);

            Assert.That(actual, Is.EqualTo(expected));
        }