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Suppose that you provide a login screen in your client Microsoft Visual Basic application that is designed to collect a username and password in two input text boxes (call them InputUserName and InputPass) . You construct a query that verifies this information against a Users table, which you have in your database to determine whether to allow or reject the login attempt . Run the following code to create the Users table and populate it with two sample users:

Table 3-2

USE tempdb; IF OBJECT_ID('dbo.Users', 'U') IS NOT NULL DROP TABLE Users; CREATE TABLE dbo.Users ( username VARCHAR(30) NOT NULL PRIMARY KEY, pass VARCHAR(16) NOT NULL ); INSERT INTO Users(username, pass) VALUES('user1', '123'); INSERT INTO Users(username, pass) VALUES('user2', '456');

So, by increasing the structural testing of a complex algorithm, the tests provide additional information and help reduce overall risk One study found that pair-wise testing increased structural testing of blocks and decisions by more than 25 percent with a.

Suppose that you re using the following Visual Basic code at the client application to construct a query and verify the user credentials:

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Description Indicates whether a Web part can be removed from the page. Indicates whether a Web part allows you to edit its properties. Indicates whether a Web part can be hidden on a Web page. Indicates whether a Web part can be minimized. Indicates whether a Web part can be moved within its zone only or between zones. Indicates the caption of the Web part. Indicates the state of the Web part: normal or minimized. Indicates the type of the frame for the Web part: border, title, title and border, or none. The Web part description used in the catalog and as a ToolTip in the title bar. Indicates the direction of the text: left-to-right or right-toleft. Indicates which kind of Help user interface is displayed for a control. The URL to a topic in the Web part s help.

sql = "SELECT COUNT(*) AS cnt FROM dbo.Users WHERE username = '" _ & InputUserName & "' AND pass = '" & InputPass & "';"

Suppose that user1 enters the following information in the input boxes:

fewer number of tests as compared to random input testing. Microsoft has collected empirical data to show increases in both block and arc coverage of product code using pair-wise coverage as compared to a set of black box-designed tests, as illustrated in Table 5-6. The data also reveals additional increases in both block and arc coverage with sequential increases in n-wise coverage. Although increases in structural testing help reduce overall risk, this result comes with additional cost. Table 5-6: Testing effectiveness of Combinatorial Testing by increased Code Coverage Open table as spreadsheet Total block = 1,317 Manual tests Pair-wise tests n-3 coverage n-4 coverage Number of tests Block covered Code coverage 236 960 73% 136 979 74% 11 800 994 75% 10 3,533 1,006 76% 10

Property AllowClose AllowEdit AllowHide AllowMinimize AllowZoneChange Caption ChromeState ChromeType Description Direction HelpMode HelpUrl

InputUserName = "user1" InputPass = "123"

Your code constructs the following query, and executing it returns a count of 1:

Description Indicates whether the Web part is displayed on a Web page. Indicates whether multiple users share the Web part. Gets the collection of ConnectionPoint objects that are associated with the Web part. The ConnectionPoint class defines a possible connection in which the Web part is either the provider or the consumer. Indicates the string used as the first string in the title of a Web part. (See the description of the Caption property.) A style object used to render the title bar of the Web part. Indicates the URL where you can access additional information about the Web part control. If specified, the URL appears in the title bar of the part. The set of verbs associated with the Web part. The zone that currently contains the Web part. ID of the zone that currently contains the Web part. The index of the Web part in the zone it lives in.

SELECT COUNT(*) AS cnt FROM dbo.Users WHERE username = 'user1' AND pass = '123';

Another measure of effectiveness is reduced operational costs. At Microsoft, several teams have significantly reduced operational costs in various ways. For example, because the output of the PICT tool is a tab-delimited file it is relatively easy to incorporate into data-driven test automation. Many teams have realized a large increase in the number of automated tests as well as an increase in the breadth of coverage provided by those tests through randomizing the test variables used. Other teams have significantly reduced the number of environment configurations, resulting in fewer tests with no degradation in overall effectiveness. And the adoption of PICT has revealed several defects that were previously undetected in other test passes prior to release of software.

Your code checks whether the count is greater than 0 . If it is, as is the case here, you allow the user to log in, and if it is 0, you reject the login attempt . A hacker versed in SQL injection will very likely try to enter the following inputs:

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