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In fact, I've been extremely pleased to see how many development shops are using Tester Not only is it easier to deal with than many commercial systems, it's quite a bit less expensive, too The Bane of Unit Testing: User Interfaces I'm firmly convinced that Microsoft Windows developers get their carpal tunnel syndrome not from typing their source code but from hitting the same keystroke combinations over and over to test their applications After the 5,000th time you type Alt+F, O, your wrists are locked tighter than rebar in concrete Without a tool to automate the tasks involved in accessing the different features of your applications, you generally have to follow some sort of script to ensure that you're doing sufficient unit testing Testing with manual input scripts is totally boring and the boredom that results leaves plenty of room for human error.

If you write code to check the return value of every method call and filter the return value up to your own callers, your application s performance will be seriously affected But performance aside, the amount of additional coding you must do and the potential for mistakes is incredibly high when you write code to check the return value of every method Exception handling is a much better alternative However, exception handling has a price: Unmanaged C++ compilers must generate code to track which objects have been constructed successfully The compiler must also generate code that, when an exception is caught, calls the destructor of each successfully constructed object It s great that the compiler takes on this burden, but it generates a lot of bookkeeping code in your application, adversely affecting code size and execution time .

Automating your unit tests will mean that you don't have to type so much and that you can quickly verify the state of your code Unfortunately, the Recorder application that used to ship with Microsoft Windows 30 and 31 doesn't come with any of the 32-bit operating systems For those of you new to Windows, Recorder wrote your mouse and keyboard interactions to a file so that you could play them back as if they were physical mouse and keyboard events Although several third-party products are available that will automate your application and a whole lot more (such as completely validate every pixel in a screen comparison and maintain databases of which tests ran when), I wanted something that was lightweight and geared toward development engineers Thus, the idea for my Tester application was born.

On the other hand, managed compilers have it much easier because managed objects are allocated in the managed heap, which is monitored by the garbage collector If an object is successfully constructed and an exception is thrown, the garbage collector will eventually free the object s memory Compilers don t need to emit any bookkeeping code to track which objects are constructed successfully and don t need to ensure that a destructor has been called Compared to unmanaged C++, this means that less code is generated by the compiler, and less code has to execute at runtime, resulting in better performance for your application Over the years, I ve used exception handling in different programming languages, different operating systems, and different CPU architectures In each case, exception handling is implemented differently with each implementation having its pros and cons with respect to.

import java.lang.System; def faceCards = [ "Jack" , "Queen" , "King" ]; var king = faceCards[2]; def ints = [10,11,12,13,14,15,16,17,18,19,20]; var oneInt = ints[3]; var outside = ints[-1]; System.out.printf("faceCards[2] = {king}\n" "ints[3] = {oneInt}\n" "ints[-1] = {outside}\n"); faceCards[2] = King ints[3] = 13 ints[-1] = 0

When I started thinking about creating an automation utility, I spent some time considering exactly what I'd expect from such a tool At first, I thought about developing a utility akin to the old Recorder application Way back in the days of Windows 30, I had a complete set of REC files to drive my tests However, the big problem with Recorder was that it didn't provide a way to do conditional tests If my application signaled an error during the test, Recorder just went along its merry way, playing back the recorded keystrokes and mouse clicks, completely oblivious to my application's distress One time I wiped out half my operating system with Recorder because I was testing a WINFILEEXE extension, and when my extension had a problem, Recorder played the delete files sequence all over the System directory.