Mock HTTP layer to do complex tasks like uploading photo to Flickr 

In this post, I will show how you can use Typemock to fake out complex HTTP POST like uploading photo in Flickr server. The example which will be shown here, gives a pretty much generic idea of faking out HTTP calls and gain access to the response stream for comparing result with original content.I have used, N-Unit along with Typemock which is run thorough TMockRunner.exe to perform the mock test. 
  
To get started, let's see what is really cooking in PhotoRepository.Upload in LINQ.Flickr which we are going to mock.
  
image 



To focus strictly on mocking,  I have removed non-mockable parts and blocked out sections to be mocked. These include the following




  
1. Mock calls to Authenticate.


  
2. Get a mocked signature.


  
3. Mock the HttpRequest object 


  
4. Get reference of the Stream so that Stream.Write  writes to our desired media rather to the original request stream.


  
5. Create a Fake WebResponse object and marry it with Request.GetResponse


  
6. Get reference of the response stream  that will be filled with data from local resource.





Staring off every mock should have a MockManager.init(). we can further check if it is initialized or not by MockManager.Isinitialized.I have moved the common mock statements to a separate class for LINQ.Flickr which I call FakeFlickrReposity. It takes in the type of repository and the returned object and it can be constructed by a simple using block as it implements IDisposable.



using (FakeFlickrRepository<PhotoRepository, Photo> photoAddMock = 
new FakeFlickrRepository<PhotoRepository, Photo>()) 
{ 
   ... 
   ... 
}


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