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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 );

QFETCH( Qt::Key, key ); QFETCH( int, startValue ); spinBox.setValue( startValue ); QSignalSpy spy( &spinBox, SIGNAL(valueChanged(int)) ); QTest::keyClick( &spinBox, key ); QTEST( spinBox.value(), "endValue" ); QFETCH( bool, willSignal ); if( willSignal ) { QCOMPARE( spy.count(), 1 ); QTEST( spy.takeFirst()[0].toInt(), "endValue" ); } else QCOMPARE( spy.count(), 0 ); } void SpinBoxTest::testKeys_data() { QTest::addColumn<Qt::Key>( "key" ); QTest::addColumn<int>( "startValue" ); QTest::addColumn<int>( "endValue" ); QTest::addColumn<bool>( "willSignal" ); QTest::newRow( QTest::newRow( QTest::newRow( QTest::newRow( } The changes to the other two test case slots, testClicks and testSetting, are almost identical to the ones made to testKeys. The biggest change is that testSetting had to be extended with a startValue column and a new test case testing the no-signal case. The changes to the tests are limited to adding a new object. The state of this object is then checked by using the standard macros from the QtTest module. This means that the unit is being built and used in exactly the same way as for tests not checking for signals. "Up" ) << Qt::Key_Up << 5 << 6 << true; "Down" ) << Qt::Key_Down << 5 << 4 << true; "Up, limit" ) << Qt::Key_Up << 10 << 10 << false; "Down, limit" ) << Qt::Key_Down << 1 << 1 << false;

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The IfElse activity allows you to set up branching within a workflow. Branching within a workflow performs some action (in this case, an activity) based on a condition. You define and evaluate that condition within an IfElseBranch activity within the IfElse activity. When the workflow encounters an IfElse activity, the leftmost IfElseBranch activity is evaluated first. If that branch returns True it s executed; otherwise, the next branch is executed. You don t need to set a condition on the second branch it s considered the Else part. The IfElse activity requires one branch, but the second is optional. You can use the IfElse activity with one branch to be the same as an If . . . EndIf statement. Finally, both a Sequential and a State Machine workflow can use the IfElse activity.

Until now, you have been testing only parts of the interfaces of classes that are shipped with Qt. Now you ll create a unit test for the ImageCollection class from 13.

Before looking at the unit test class, let s quickly review the ImageCollection class, which is used to keep images and tags. It is possible to add new images, add tags to images, retrieve all tags, retrieve all ids for images matching a set of tags, and get a specific image from an id. The available methods are listed as follows: QImage getImage(int id): Gets an image from a given id. QList<int> getIds(QStringList tags): Retrieves the ids for the images matching any of the tags specified. If no tags are specified, the method returns all ids. QStringList getTags(): Retrieves a list of all tags. addTag(int id, QString tag): Adds a tag to a given image. addImage(QImage image, QStringList tags): Adds an image to the collection with the given tags.

Attaches the class specified in className to the control. It must be a valid, defined CSS class available to the host page. Passes focus to the control. If the control is off the page, scrolls the page until it is in view. Unattaches the CSS class specified in className. If the CSS className is currently attached, unattaches it; otherwise, attaches it.

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