public void BuildBodyStep_WithPlainText(string text) { var contentStep = new MessageBuilder.BuildContentStep.BuildBodyStep(MailerMessage.Create()); var stepBuilder = contentStep.WithPlainText(text); stepBuilder .Should() .NotBeNull() .And.BeOfType <MessageBuilder.BuildContentStep.BuildBodyStep.BuildTextBodyStep>() .Which.As <IBuilderContext>() .Message.Body .As <ContentBody>() .PlainTextContent .Should() .Be(text); }