public void SetCompletedDate_BeforeReceivedDate_Throws()
 {
     Assert.Throws <InvalidOperationException>(() => FinancialGuarantee.Complete(AnyDate.AddDays(-1)));
 }
        public void SetCompletedDate_AfterReceivedDate_SetsDate()
        {
            FinancialGuarantee.Complete(AnyDate.AddDays(1));

            Assert.Equal(AnyDate.AddDays(1), FinancialGuarantee.CompletedDate);
        }