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As you see immediately, we chose to manually create the UI, rather than use Qt Creator within the Nokia Qt SDK. The reason is only to show you that you can; you could easily use the user interface you created from 4 with Qt Creator. Regardless, the code creates the two visible elements and combines them in a single widget, set to be the main widget of the QMainWindow using QMainWindow s setCentralWidget method. Perhaps the most interesting code in the constructor is the lines that link the QuakeModel instance with the QSortFilterProxyModel instance. As the name suggests, the QSortFilterProxyModel is a model in the object-oriented sense (it inherits from QAbstractItemModel), but doesn t contain any data. Instead, it provides a view with an ordered or filtered model (hence the proxy in its name) created using an indicated role. Here, the code: Tells the proxy model to use the data in the mEventModel model. Says the model should be sorted on demand, not automatically when items are added or removed. Tells the proxy model to present the data in the mEventModel sorted by a custom role, QuakeListModel::When. In turn, the QListView accesses the data through the proxy model; behind the scenes the proxy model does some magic with its model indexes so that the model data appears to be sorted by time. Once the user interface component and model is initialized, the constructor invokes fetch to obtain the latest seismic data. It s worth mentioning that in the user interface, our error handling is admittedly primitive, but demonstrates that something needs to be done in the event of an error. In our case, we simply emit an error message, which the UI will present in a dialog indicating the nature of the error (Listing 4 6).

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3 Test everything: If it can break, test it If it can produce effects or output that s not clear from its interface, test it Even simple components can produce errors in other components if their intent or function is not clear I equate tests in software to formal proofs in mathematics Unless there is a comprehensive set of tests, any assurance of a component quality is just an illusion 4 Establish a test harness early in the development: Set up testing as part of the build and if possible, use a test framework that integrates well with your development tools; doing this early in a project will ensure that the whole team embraces testing and that it becomes the path of least resistance 5 Code enough to pass the unit tests: The task is complete when the unit test is complete.

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Listing 4 6. Showing an error message void MainForm::handleError(const QString& message) { QMessageBox box(QMessageBox::Critical, tr("Error"), message, QMessageBox::Ok, this); qDebug() << message; }

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Just like code shouldn t be checked into a version control system without compiling, code shouldn t be checked in unless it has a comprehensive set of unit tests and those tests pass 6 Map tests to use cases, user stories, or features: Regardless of what requirement gathering techniques you use, map those requirements to a clearly defined set of tests 7 Enable continuous integration: As you ll learn in 9, continuous integration hinges on developers running the unit tests before the code is checked in In addition, all unit tests should be executed in a build server at least once a day (hourly seems to work well as a build interval) or after any code has been checked in 8 Don t overtest: Test enough to cover functionality Add new tests as defects appear.

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