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CHAPTER 6 CREATING TESTWARE COMPONENTS
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file the user wants to make. The new version might look something like Listing 6-11 (which is used in Exercise 6-7). Once this new version is made, the old version will still exist, and any application that uses the original version will still work. When the new ASP.NET testware calls the Save() method without any arguments, the original (default) version runs; however, if it used FormatData("xml") or FormatData("html"), it will run the new version. If someone else wants a new format later, you can easily add a new case statement to match the new format. Creating multiple versions of a method in a single class is one form of polymorphism. Although the name sounds intimidating, it just means that the method has been changed ( morphed ) into many ( poly ) versions. Instead of using many different names for methods that do almost the same thing, it is good practice to use one name and create different overloads of that method. Overloading is the fancy term used when polymorphing a method in the same class. Microsoft leads by example in .NET as they use overloaded methods everywhere. Take, for example, the MessageBox.Show() method. As of this writing, there are 21 overloaded versions of the Show() method. If Microsoft had chosen to create a new method for each combination of parameters, that would have been 20 more method names you would have to know. As it is, all you need to know is that the Show() method can be used in many ways. One more thought, since you did not change the original FormatData() method, it still exists unaltered. So, you will only need your newest version of the ReportMaker.dll to work with both your existing and new applications. Reducing the number of file versions needed for your applications makes keeping track of testware files much easier. So, in the end, we recommend that you make your testware more developer friendly (that s friendly for you and your follow testers) and use polymorphism when you need to add new features. To get some practice, you will build the example we just talked about in Exercise 6-7.
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Exercise 6-7: Polymorphic Components
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In this exercise, you will change your ReportMaker.dll component file so that is has a new version of the FormatData() method. This new method will have one parameter that is used to set a choice between .xml, .html, and .csv files. After you have changed this class, you will want to test it by creating a simple test harness to make sure it does the job as expected.
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Tip Before you begin, make a back-up copy of the ReportMaker folder before you start. To do this, just use Windows Explorer and copy the whole ReportMaker solution folder you created in Exercise 6-6. Now paste this folder to a safe location. You should always make a backup of the old version of the files in case you ever need it again. Visual Studio will not do this for you, so you must do it manually. Also, remember that the Save As features will not accomplish this either. You must copy the whole folder
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1. Open the ReportMaker solutions and add a new version of the Save() method beneath the old version using the code in Listing 6-11.
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CHAPTER 6 CREATING TESTWARE COMPONENTS
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Listing 6-11. An Overloaded Version of FormatData() VB .NET Public Sub FormatData(ByVal FileType As String) 'To keep the code simple our XML and 'HTML files will only have one report each If (System.IO.File.Exists(FileName) = True) Then System.IO.File.Delete(FileName) End If Select Case FileType Case "xml" 'Pull data out of the variables above and put it into a string 'Notice we are using "" to escape the dbl-quote in the xml attributes strData = "< xml version=""1.0"" encoding=""utf-8"" >" strData += "<root>" strData += vbCrLf strData += "<Tester>" + Tester + "</Tester>" strData += vbCrLf strData += "<ApplicationName>" + ApplicationName + "</ApplicationName>" strData += vbCrLf strData += "<BuildNumber>" + BuildNumber + "</BuildNumber>" strData += vbCrLf strData += "<DateReported>" + DateReported + "</DateReported>" strData += vbCrLf strData += "</root>" Case "html" strData = "<html><head>" strData += "<title>" + Description.Substring(1, 5) + "...</title>" strData += "</head><body>" strData += "<hr />" strData += "<b>Testers Name: </b>" + Tester strData += "<br />" strData += "<b>ApplicationName:</b>" + ApplicationName strData += "<br />" strData += "<b>BuildNumber:</b>" + BuildNumber strData += "<br />" strData += "<b>DateReported:</b>" + DateReported strData += "<hr />" strData += "</body></html>" Case Else FormatData() 'call the original version End Select End Sub
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