public void AsMessageBodyCaptureDescriptor() { const string expected = "claim"; var originalStream = MessageFactory.CreateClaimCheckOut(expected).AsStream(); var part = new Mock <IBaseMessagePart>(); part.Setup(p => p.GetOriginalDataStream()) .Returns(originalStream); var descriptor = part.Object.AsMessageBodyCaptureDescriptor(); Assert.That(descriptor.Data, Is.EqualTo(expected)); }