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Along my journey as a professional software engineer, I have encountered few developers eager to write code that exercises their code In a typical structured environment, management is usually the least excited about developers writing unit tests because they assume it takes them away from actually writing production code Some developers proudly proclaim that their code is perfect the first time, and will fly through the testing phase of development only to be shocked when their flawless creation of art and code has been returned, unapologetically, by some random QA guy You know this scenario: That random guy in QA is the iTunes AppStore approval process.

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e deptno = 10; EXT(NUMLIST) -----------4231 1234 2345

While approval times have gotten better, wouldn t you like to know that when you submit an app for approval that you have run your app through a thorough battery of tests that you ve handcrafted over the lifetime of the app s development I feel much more confident giving an app to the AppStore approval gods, or a client, once it has passed my suite of unit tests This doesn t mean I ve caught every bug to be found But it does mean that old bugs don t show up It also means that the new features I add don t break existing code, and those simple assumptions that I had taken care of six months ago when I started working on the app are taken care of, once and for all.

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The DEPTNO value (10) in the WHERE clause of this query is carefully chosen, in order to avoid error messages. Just change the DEPTNO value in Listing 12-7, and you will see the corresponding Oracle error messages.

Extend the range of your robot s reception by putting tinfoil around the inside of the tube. Print out and put a face on your tube with team names or expressions.

With all the cool things to write (and read) about, why do something on, of all things, unit tests Unit tests are boring OpenGL, MapKit, or GameKit is where the hotness is with games, location-based applications and peer-to-peer connectivity, so who has time for unit testing Besides, this code is never going onto a customer s device anyway, so why waste time on it in the first place The simple answer is that Unit Tests will return your time investment tenfold It may not feel like it when you re writing tests and getting things set up, but every test you write will make your code more solid, flexible, reusable, documented, and easier to read After.

Note The EXT stored function is kept as simple as possible. For example, there is no code to handle situations where employees have no phone number list or an empty phone number list. It is relatively easy to enhance the EXT function definition with some proper exception handling. However, this is not a PL/SQL book, and the EXT function is meant only to illustrate the concept.

It is impossible to update specific elements of an array. You can only replace an entire array value by a new one.

a while, you will also start to notice that tested code will be written in smaller, more understandable chunks Methods will be fairly concise and easily understandable One big advantage to testing your code is that you will rarely use the debugger Why use the debugger to step through your code when you have something that verifies the method is returning the correct value automatically It turns out that minimizing your time spent in the debugger will speed up the time it takes to complete your app with a higher level of quality You just don t realize how much the debugger slows you down until you ve essentially automated that process So, if you think unit testing takes too much time, ask yourself how much time you spend in the debugger Unit Tests are something even Apple Engineers are starting to pick up.

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