ActionScript 3.0 :: Coding Pattern To Test Private Functions
Dec 11, 2011
I came up with a coding pattern to test private functions and variables out of necessity. Assume the project structure below for example. You have separate folders (packages) for your main production code and test code, and each has the folder for the utility for private member access (testabilityutil).
[Code]...
Then, you have PrivateAccessor.as as below in the testabilityutil in the test code side, and you can access to the private members through it in your test cases (MyClassTest.as). Note you can access to the instance members and class static members in the same syntax. (You may notice that the mechanism can be simpler if you don't need static member access.) Obviously, PrivateAccessor.as should be used only in the test cases but never in the production code.
[Code]...
The advantage of this approach is now your test code can get the maximum flexibility to access to the private members with a minimum burden. Also the "instrumentation" is localized as much as possible, so that you can easily eliminate it from the release build using conditional compilation if you want to.
This approach also has cons, of course. You may not like to have a chance to break the encapsulation although it would not happen unless someone intentionally attempted it. You may think it is dirty to add one-line include in your class for instrumentation. You may question the rationale of testing private functions in the first place. It depends on your situation (your ultimate goal, your team structure, the time and resource you have, etc.) whether this could be a cost-effective option, and I would rather not debate if it is right or wrong.
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