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CHAPTER 6 CREATING TESTWARE COMPONENTS
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myCmd.CommandText = strSQLCommand; myCmd.ExecuteNonQuery(); myConn.Close(); myConn = null; myCmd = null; } } This code accesses Microsoft SQL Server but after we had tested that the testware was working, we could go back and overload the Save() method (yet again) to include a version for Access or Oracle.
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Summary
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Applications are often divided between what the human user sees (the User Interface or UI), and the code in the background that the UI works with. The UI is typically stored in an .exe file while the background code is stored in a .dll file. These .dll files are sometimes referred to as class libraries because they will be made up of one or more classes. Classes are used to organize code by data and functionality. The data stored in a class may be referred to as the class s properties, attributes, or sometimes fields. Methods provide the functionality (i.e., the behavior) of a class. Procedures are sometimes called functions, operations, or behaviors, but methods is the most common developer term. It is somewhat confusing that there are many names for the same thing, but with practice, the names will all make sense. Creating testware using OOP can save your testing team time and money. You have seen that components and OOP make testware easier to make and more flexible in use. While mastering OOP and components will take lot of study and practice, hopefully this chapter has shown you just how and why these concepts are important to testers. For further resources on OOP, see Appendix C.
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Tester s Checklist
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Use procedures to group statements together. Use classes to group field, properties, and methods together. Never allow direct access to the field from outside of the class. Use properties to let code access and change fields. Use overloading instead of using different method names for similar methods. Create reusable components to make your testing more productive.
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Automation with Console-Based Testware
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lthough Console applications don t seem like much fun to make, they can be very useful when creating testing automation software. One reason they are often overlooked is that they do not have an attractive interface; instead, the user looks at a command prompt (i.e., the DOS window). For many users, this window is not something they are familiar with, so they find it intimidating. In fact, many developers purposely create these types of applications to hide the more powerful programs on a PC from casual users. In this chapter, you will look at two Console applications ones that you may find useful in just about any test lab. The first application gathers information about the computer you are testing and creates a report. The second application will review this report for requirements, download an application from a network share, and upload a status report about the computer and the installation to another network share. In addition, we will talk about how you can use the Windows Scheduler to run these programs automatically.
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Objectives
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By the end of this chapter, you will be able to do the following: Discuss how Console applications are used in testing Write code to report information about the PC you are testing on Write code to read the report information and verify requirements Write code to download testware from a network share Write code to send a simple report to a network share Create a schedule to run an application
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Using Console Applications
If you are used to working with Windows applications, then Console applications may seem confusing at first. You have to think differently about how you capture the data from your users
CHAPTER 7 AUTOMATION WITH CONSOLE-BASED TESTWARE
and display messages back to them. When programming Windows applications, you build all your code behind a graphical UI, load it into memory, and respond to events that happen. Console applications are used mostly for simple tasks where the amount of interaction you need is greatly reduced. With a Console application, you start the program, proceed through the code until the end, and then close the program. You do not wait to respond to events, and you seldom query the user about their choices while the program is running. Still, you will usually want some initial data sent to the program. Let s review how you can add input and output interaction with Console applications.
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