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Qt classes emit signals when they are stimulated by programmatic calls or user interaction. Because signals and slots are key components of Qt applications, they must not be left out during testing. You can use the QSignalSpy class to listen to signals without connecting to them. A signal spy is hooked up to listen to a certain signal from a certain object. The spy object then records the argument values for each signal caught. Listing 16-21 shows the data-driven testKeys method extended with signal listening capabilities. (The original implementation slot was shown in Listing 16-19.) The highlighted lines in the listing show major additions to the slot. Looking at the changes from the top down, the first line creates a QSignalSpy object for monitoring the valueChanged(int) signal emitted from the spinBox object. The signal spy is created after the spin box has been set up with the start value to avoid catching a signal by mistake.

When an exception that isn t an HTTPException is raised, it goes straight through the try...except block in _inspect_call() and isn t caught until another try...except block in the error-handling middleware. If debug mode was enabled, the EvalException middleware would have been set up. If not, the ErrorMiddleware would be in place. If the EvalException middleware is set up, you will see the familiar Pylons Interactive Debugger. If not, an error report gets e-mailed, and the exception is turned into a 500 Internal Server Error response by the ErrorMiddleware. The StatusBasedRedirect middleware is below the error-handling middleware, so it receives the response after the error handler. At this point, the StatusCodeRedirect middleware can t distinguish between a 500 error triggered by the ErrorMiddleware or a 500 response from a Pylons controller action, so both are treated in the same way. In debug mode 500, responses are ignored by the StatusCodeRedirect middleware; with debug mode disabled, an error document is displayed.

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Note This test checks only one signal. In real life, you would include the valueChanged(QString)

In programming languages that are interpreted, sometimes the interpreter does provide such checking at runtime What about Java and C# Java and C# are compiled as well as interpreted Java and C# programs are compiled into a bytecode or common language that is interpreted at runtime A Java or CLR (Common Language Runtime) interpreter will enforce type safety and check for incorrect accesses, overflows of buffers, and code that runs past the bounds of an array6 In Java or C#, you do not typically have to worry about buffer overflow vulnerabilities because the interpreter does such checking for you, and will raise an exception if a buffer is overrun or overflowed If that occurs, your program may crash (assuming that you do not catch the exception), but at least an attacker will not be able to take control of the machine that your program is running on.

When the StatusCodeRedirect middleware receives a response that it was set up to intercept, it uses a copy of the request information (which it made when the request was passing through it toward the controller action) to start a subrequest to the error controller s document() action to generate the familiar Pylons error page. You ll see more about error documents, how they work, and how to customize them in 21.

When the spy has been created, the actual test is being performed. After the test has been performed, fetch the value for the new column willSignal. If the value is true, a signal is expected. If a signal is expected, verify that the spy has caught exactly one signal. Before you look at how this is done, you must understand that QSignalSpy inherits QList<QList<QVariant> >. This means that it is a list of lists holding variant objects. Check the number of signals caught using the count property. To get the value from the first argument from the signal, use the takeFirst method to get a list of argument values for the signal. The zeroth index of the list returned (that is, the first argument of the signal) is converted from QVariant to an integer using toInt before it is compared with the expected end value. If willSignal tells you that no signal was expected, verify that no signal was emitted. It is easy to forget to check the no-signal case. If you miss it and a signal is emitted without a change, two objects connected to each other will hang in an infinite loop. The changes to the test case data slot are limited to the new column willSignal holding a Boolean telling the test whether a signal is expected or not. Listing 16-21. Testing keyboard interaction now with additional signal-monitoring skills void SpinBoxTest::testKeys() { QSpinBox spinBox; spinBox.setRange( 1, 10 );

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