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  1. PO
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    <p>I am not familiar with C#, so i can't help you with the mock question, i guess that depend on your testing framework.</p> <p>I do do a lot of TDD though and generally my approach is a top down approach. I first think of simply the code I want to write to do something. Lets say in your example I have a class Client and want be able to do some thing like: Client.initiate_reviews</p> <p>So I write a test that sets up the context (a couple of clients, some with reviews). Then call Client.initiate_reviews, and then write up all assertions to determine whether it has done its job, i.e. for the subset of clients that was due for a review, is there now a review in progress and are all the expected sent?</p> <p>Depending on how many side effects a method has it might be prudent to split it up in multiple tests.</p> <p>I then go into the client class and define the method and think of the code I would want to write in it. Maybe like this:</p> <pre><code>clients = Client.find_all_due_for_review for_each client in clients { review = Review.start_new_for(client) Letter.send_for_review(review) } </code></pre> <p>I would then write the tests for the methods called in this method that I have to implement. The find_all_due_for_review doesn't have side effects, but return something so of course you would test the return value here and maybe whether nothing has changed. And repeat until the first test succeeds.</p> <p>This way every aspect is properly tested and you even end up with some methods you can reuse.</p> <p>Hope this helps!</p>
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    1. POThinking OO with TDD - Where to start?
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    1. USArthur
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    1. COso the difference between your approach and Mark Brackett's is that you use a Client object. Which is what I would do but doesn't this violate single responsibility principle? just our curiosity what language is that too?
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      1. USJohnno Nolan
    2. COHmm, I guess that is true, but I always try to keep the model simple and just have the entities from the domain, so in this case Client and Review (and maybe letters somehow). And then fit in the functionality in the class it affects. Coming to think of it, i guess the initiate reviews method should then be in Review, which calls a method from Client to gather the clients with a review due. But having a separate class calling methods in both Client and Review can also be prudent from a separation of concerns p.o.v. Especially if there is more related functionality that can be put there.
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      1. USArthur
    3. COOn the language: I'm a ruby programmer, but the code i wrote before is more pseudo code. In ruby it would be more like: Client.find_all_due_for_review.each do |client| Review.start_for(client) end And i would probably have the sending of letters as a side effect caused by starting the review, depending on the business rules behind it.
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