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CHAPTER 6 CREATING TESTWARE COMPONENTS
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For a more complex example, consider an application that allows you to fill up a textbox with a word or words and then searches a database for information about those words. Most of us have used these types of applications while doing web page searches. However, did you know that these simple applications are susceptible to a very serious problem called SQL injection attacks Here is how it works. Most database programming uses Structured Query Language (SQL). One SQL command is the ; DROP TABLE command for example, ; DROP TABLE Customers, where Customers is a table in the database. This statement will remove the Customers table from the database. If the textbox on an application permits it, and the security of that database allows it, a tester (or hacker) could type this statement in the textbox of an application and the code will drop the table (see Figure 6-5). When this slips past development and test teams and a hacker inserts this kind of command, then it s called a SQL injection attack. How could you stop this from happening using validation in your application Since the semicolon (;) indicates the end of one SQL statement and the beginning of another, you could do something as simple as checking if a semicolon is in the text and, if you find one, remove any text after it. Although there are a number of ways to stop this at the database level as well, it s considered good practice to place validation at multiple levels.
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Figure 6-5. A SQL injection attack Looking for a specific combination of characters is also a common validation task. Character data going into the application needs to be in the correct format and contain only acceptable values. As a tester, you know these boundary analysis issues come up when there is a fixed range of values that are acceptable to the program and you verify that it will not exceed these boundaries for example, ensuring that a salary field does not allow 0 or negative values. While choosing the proper size or type for a variable can help with this, when working with character data you may need tools that are more powerful. Classic examples of this are when working with dates or when someone enters 1, 2, or 3 when they should a have typed Good, Better, or Best. If these incorrect values are accepted and stored, the data is now a mix of both acceptable and unacceptable values and, thus, should be considered corrupt data. You want to make sure that the data being entered is a match for that data you want. You saw Regular Expressions in 3 and how they are used to find, and sometimes replace, a searched-for value. Most modern programming languages have Regular Expressions support. In .NET, Regular Expressions support is built into the System.Text.RegularExpressions.Regex class. For example, if you wanted to force a report file to end with .csv, you could create a validation method like the one shown in Listing 6-8.
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CHAPTER 6 CREATING TESTWARE COMPONENTS
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Listing 6-8. Using Regular Expressions VB .NET Dim strPattern As String = "^.+\.[c][s][v]$" If (System.Text.RegularExpressions.Regex.IsMatch(strTempString, strPattern)) Then Return True Else Return False End If C# // use the @ symbol to make sure C# uses the string exactly as typed string strPattern = @"^.+\.[c][s][v]$"; if (System.Text.RegularExpressions.Regex.IsMatch(strTempString, strPattern)) { return true; } else { return false; } Most likely, this code seems a bit confusing; but trust us, you don t have to be an expert in Regular Expressions to use them. You can simply copy this example or one of the many other examples in Microsoft s documentation and on many Internet websites. These examples can be used to find common patterns, such as e-mail addresses and phone numbers. A complete discussion of Regular Expressions is beyond the scope of this book, but take a look at how we used one in Listing 6-8 using the breakdown in Table 6-4.
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