public void WithCardImage_should_return_CardImageAssertions() { var cardImage = new CardImage(); var receiptItems = ReceiptItemTestData.CreateReceiptItemSetWithOneItemThatHasSetProperties(image: cardImage); var sut = new ReceiptItemSetAssertions(receiptItems); sut.WithCardImage().Should().BeAssignableTo <CardImageSetAssertions>().And.NotBeNull(); }