public void ShouldNotReturnAnyDiscountedBooksBecauseAmazonHasNoPaperbackVersions() { var amazonBookOne = new BookBuilder().WithAuthor("Author").WithTitle("Title").IsType(BookType.Hardback); var amazonBookTwo = new BookBuilder().WithAuthor("SomeAuthor").WithTitle("Title").IsType(BookType.Kindle); GivenAmazonHasTheseBooks(amazonBookOne, amazonBookTwo); GivenAUserWithOwnedBooks(new BookBuilder().WithAuthor("SomeAuthor").WithTitle("Title").IsType(BookType.Kindle)); WhenTheUserRequestsAmazonBooks(); TheDiscountOfTheBookIs(amazonBookTwo, 0); TheDiscountOfTheBookIs(amazonBookOne, 0); }