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When test engineers write automated test scripts, they must take the time to define and analyze the requirements. This is when the process of writing the scripts actually begins. This process is necessarily interactive as the testers repeatedly run the scripts, then improve and perfect them to meet the ever-changing testing requirements. After the scripts are working, they must be updated on a regular basis to ensure they work with new versions of the application being tested. A professional software developer would recognize this process of developing and updating automated test scripts as essentially the same one used to develop software applications. So, the writing of automated test scripts is software development. The skills needed to be a good automator are similar to those required of a good software developer. In addition to software development skills, automators must also be skilled at testing. To find out more about how to be a good tester, get Cem Kaner s book, Testing Computer Software, 2nd Edition (Wiley, 1999). Another good book is Edward Kit s Software Testing in the Real World (Addison-Wesley, 1995). (For publication information and other good books on software testing, see Appendix C of this book.)
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CHAPTER 1 AUTOMATED SOFTWARE TESTING WITH .NET
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It is important to recognize that the same rules for developing good software apply to developing good test scripts. Good planning and design are important, as is allowing sufficient time to develop the code and supporting utilities.
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Goals of Good Testing Software
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Test scripts, like application code in general, should be Readable: Using standard naming conventions and constants, and creating project standards for code development make code more readable. If code is readable, it can be more readily understood and modified, which makes it easier to work with and to adapt to future projects. Reusable: Writing routines that can be reused within the same project (and sometimes modified to work within another project, as well) can save time and duplication of effort. Some possibilities may include logging utilities to document test results, front-end or driver routines to make running test suites easy, or specialized utilities that make working with your test target easier, like start-up and shutdown routines. Maintainable: Writing code that is easy to update is important. You can account for a changing application in many ways, including the use of constants, library files, the Windows Registry, and initialization files. Portable: Writing suites that can be easily changed makes them portable. For example, don t directly place file paths into your code. Instead place files within the assembly of your application and use relative paths to reference them, or let the user specify locations by providing options for them to set. (We ll see how to do this as we proceed in the book.) Of course, these are guidelines to follow within reason. As testers, we are far more likely than developers to write simple testware that ends up being thrown away because it s a one-time, special-purpose situation we are addressing. And there are times that copying and pasting can be a good thing. The most important of the four able qualities is the ability of your testware to be readable. Reusability, maintainability, and portability should be considered for testware that is intended to be used many times, such as test utilities, and test drivers, i.e., code, that are used as a front end to run other tests. Code can be written in many different ways. When we review code written by others, we try to determine its readability and, therefore, the ease with which we can maintain or alter it. When we write code for testing purposes, we will try to levy that same mandate on our own work. We will then reap the same rewards as the developers and, in the process, learn a bit about why they do the things they do. Throughout this text, we will emphasize good programming technique. Even when in a hurry on a test project, it is absolutely true that it is just as easy to write code properly as it is to write it poorly. In this book, you will explore ways to implement these goals for yourself and for the applications you test.
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