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PORecording interaction on an inflection point using mocking framework. Moq
 

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    <p><strong>Updated version of question</strong></p> <p>Hi. </p> <p>My company has a few legacy code bases which I hope to get under test as soon as they migrate to .NET 3.5. I have selected Moq as my Mocking framework (I fell in love with the crisp syntax immediately). </p> <p>One common scenario, which I expect to see a lot of in the future, is where I see an object which interacts with some other objects. </p> <p>I know the works of Michael Feathers and I am getting good at identifying inflection points and isolating decent sized components. Extract and Override is king.</p> <p>However, there is one feature which would make my life a whole lot easier.</p> <p>Imagine Component1 interacting with Component2. Component2 is some weird serial line interface to a fire central or somesuch with a lot of byte inspection, casting and pointer manipulation. I do not wish to understand component2 and its legacy interface consumed by Component1 carries with it a lot of baggage. </p> <p>What I would like to do, is to extract the interface of Component2 consumed by Component1 and then do something like this:</p> <pre><code> component1.FireCentral = new Mock&lt;IComponent2&gt; (component2); </code></pre> <p>I am creating a normal mock, but I am pasing in an instance of the real Component2 in as a constructor argument into the Mock object. It may seem like I'm making my test depending on Component2, but I am not planning on keeping this code. This is part of the "place object under test" ritual.</p> <p>Now, I would fire up the real system (with a physical fire central connected) and then interact with my object.</p> <p>What I then would wish for, is to inspect the mock to see a log of how component1 interacted with component2 (using the debugger to inspect some collection of strings on the mock). And, even better, the mock could provide a list of expectations (in C#) that would create this behavior in a mock that did not depend on Component2, which I would then use in my test code.</p> <p>In short. Using the mocking framework to record the interaction so that I can play it back in my test code.</p> <p><strong>Old version of question</strong></p> <p>Hi.</p> <p>Working with legacy code and with a lot of utility classes, I sometimes find myself wondering how a particular class is acted upon by its surroundings in a number of scenarios. One case that I was working on this morning involved subclassing a regular MemoryStream so that it would dump its contents to file when reaching a certain size.</p> <pre><code>// TODO: Remove private class MyLimitedMemoryStream : MemoryStream { public override void Write(byte[] buffer, int offset, int count) { if (GetBuffer().Length &gt; 10000000) { System.IO.FileStream file = new FileStream("c:\\foobar.html",FileMode.Create); var internalbuffer = GetBuffer(); file.Write(internalbuffer,0,internalbuffer.Length); } base.Write(buffer, offset, count); } } </code></pre> <p>(and I used a breakpoint in here to exit the program after the file was written). This worked, and I found which webform (web part->web part->web part) control rendered incorrectly. However, memorystream has a bunch of write's and writeline's. </p> <p>Can I use a mocking framework to quickly get an overview on how a particular instance is acted upon? Any clever tricks there? We use Rhino Mocks.</p> <p>I see this as a great assett in working with legacy code. Especially if recorded actions in a scenario easily can be set up as new expectations/acceptance criteria for that same scenario replicated in a unit test.</p> <p>Every input is appreciated. Thank you for reading.</p>
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