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Use case documentation: A set of tests serves to define the use cases for the code that is being tested This means the tests also form very effective documentation of how the code should work..

The less-than and greater-than characters need to be escaped because they delimit HTML tags. If not escaped, these tags (including <script> tags) would be evaluated by the browser. If the ampersand were not escaped in this context, this would not result in a security issue, but could result in a rendering bug because the browser may interpret the ampersand as the beginning of an entity reference and not display it as intended. It is not strictly necessary to escape the quote characters in this context; however, this is necessary in other contexts, and it is convenient to use the same escaping function everywhere.

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You learned in 4 that the setup with a isSafeToClose and the closeEvent method was a good starting point for giving the user the option to save the file when a window with a modified document is closed. Now the time has come to add support for that functionality to the SDI application (the same concept also applies to the MDI application). Starting with Listing 8-20, you can see the changes made to the SdiWindow class declaration. The highlighted lines were added to handle the load and save functionality. The change is made to add the menu items Open, Save, and Save As to the File menu. The changes to the class declaration consist of four parts: actions for handling the menu entries, slots for the actions, the functions loadFile and saveFile for loading and saving the document to an actual file, and the private variable currentFilename for keeping the current file name. All methods that have to do with saving documents return a bool value, telling the caller whether the document was saved. Listing 8-20. Changes made to the SdiWindow class to enable loading and saving documents class SdiWindow : public QMainWindow { Q_OBJECT

At its heart, testing is about having confidence in the code you have written. If you have written good tests, you can have a good degree of confidence that your code works as it should. Having confidence is especially important if you are using beta or prerelease code in your application. As long as you write tests to ensure the features of the product you are using behave as you require, then you can have a degree of confidence that it is OK to use those particular features in your application. Although writing effective tests does take time, it is often better to spend time writing tests early in the project than debugging problems later. If you have written tests, every time you make a change to the code, then you can run the tests to see whether any of them fail. This gives you instant feedback about any unforeseen consequences your code change has had. Without the tests, bugs that are introduced might not be picked up for a long time, allowing for the possibility that new code you write might depend on the code working in the incorrect way. If this happens, fixing the bug would then break the new code you had written. This is why later in a project fixing minor bugs can sometimes create major problems. By failing to write effective tests, you can sometimes end up with a system that is difficult to maintain.

public: SdiWindow( QWidget *parent = 0 ); protected: void closeEvent( QCloseEvent *event ); private slots: void fileNew(); void helpAbout(); void fileOpen(); bool fileSave(); bool fileSaveAs(); private: void createActions(); void createMenus(); void createToolbars(); bool isSafeToClose(); bool saveFile( const QString &filename ); void loadFile( const QString &filename ); QString currentFilename; QTextEdit *docWidget; QAction QAction QAction QAction QAction QAction *newAction; *openAction; *saveAction; *saveAsAction; *closeAction; *exitAction;

10.5.3. Tag Attributes (e.g., Form Field Value Attributes)

It is worth noting that Pylons and all the components that make up Pylons have their own automated test suites. The Pylons tests are run every night on the latest development source using a tool called Buildbot, and the results are published online. Without these extensive test suites, the Pylons developers would not be able to have the confidence in Pylons that they do.

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