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<h1 align="center">Chapter 4: Replaying GUI Events<br /><small></small></h1>
<p>Files:</p>
<ul>
<li><a href="qtestlib-tutorial4-testgui-cpp.html">qtestlib/tutorial4/testgui.cpp</a></li>
</ul>
<p>In this final chapter, we will show how to simulate a GUI event, and how to store a series of GUI events as well as replay them on a widget.</p>
<p>The approach to storing a series of events and replay them, is quite similar to the approach explained in <a href="qtestlib-tutorial2.html">chapter 2</a>; all you need is to add a data function to your test class:</p>
<pre> ** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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****************************************************************************/
#include <QtGui>
#include <QtTest/QtTest>
class TestGui: public QObject
{
Q_OBJECT
private slots:
void testGui_data();
void testGui();
};</pre>
<a name="writing-the-data-function"></a>
<h2>Writing the Data Function</h2>
<p>As before, a test function's associated data function carries the same name, appended by <tt>_data</tt>.</p>
<pre> void TestGui::testGui_data()
{
QTest::addColumn<QTestEventList>("events");
QTest::addColumn<QString>("expected");
QTestEventList list1;
list1.addKeyClick('a');
QTest::newRow("char") << list1 << "a";
QTestEventList list2;
list2.addKeyClick('a');
list2.addKeyClick(Qt::Key_Backspace);
QTest::newRow("there and back again") << list2 << "";
}</pre>
<p>First, we define the elements of the table using the <a href="qtest.html#addColumn">QTest::addColumn</a>() function: A list of GUI events, and the expected result of applying the list of events on a <a href="qwidget.html">QWidget</a>. Note that the type of the first element is <a href="qtesteventlist.html">QTestEventList</a>.</p>
<p>A <a href="qtesteventlist.html">QTestEventList</a> can be populated with GUI events that can be stored as test data for later usage, or be replayed on any <a href="qwidget.html">QWidget</a>.</p>
<p>In our current data function, we create two <a href="qtesteventlist.html">QTestEventList</a>s. The first list consists of a single click to the 'a' key. We add the event to the list using the <a href="qtesteventlist.html#addKeyClick">QTestEventList::addKeyClick</a>() function. Then we use the <a href="qtest.html#newRow">QTest::newRow</a>() function to give the data set a name, and stream the event list and the expected result into the table.</p>
<p>The second list consists of two key clicks: an 'a' with a following 'backspace'. Again we use the <a href="qtesteventlist.html#addKeyClick">QTestEventList::addKeyClick</a>() to add the events to the list, and <a href="qtest.html#newRow">QTest::newRow</a>() to put the event list and the expected result into the table with an associated name.</p>
<a name="rewriting-the-test-function"></a>
<h2>Rewriting the Test Function</h2>
<p>Our test can now be rewritten:</p>
<pre> void TestGui::testGui()
{
QFETCH(QTestEventList, events);
QFETCH(QString, expected);
QLineEdit lineEdit;
events.simulate(&lineEdit);
QCOMPARE(lineEdit.text(), expected);
}</pre>
<p>The TestGui::testGui() function will be executed two times, once for each entry in the test data that we created in the associated TestGui::testGui_data() function.</p>
<p>First, we fetch the two elements of the data set using the <a href="qtest.html#QFETCH">QFETCH</a>() macro. <a href="qtest.html#QFETCH">QFETCH</a>() takes two arguments: The data type of the element and the element name. Then we create a <a href="qlineedit.html">QLineEdit</a>, and apply the list of events on that widget using the <a href="qtesteventlist.html#simulate">QTestEventList::simulate</a>() function.</p>
<p>Finally, we use the <a href="qtest.html#QCOMPARE">QCOMPARE</a>() macro to check if the line edit's text is as expected.</p>
<p>As before, to make our test case a stand-alone executable, the following two lines are needed:</p>
<pre> QTEST_MAIN(TestGui)
#include "testgui.moc"</pre>
<p>The <a href="qtest.html#QTEST_MAIN">QTEST_MAIN</a>() macro expands to a simple main() method that runs all the test functions, and since both the declaration and the implementation of our test class are in a .cpp file, we also need to include the generated moc file to make Qt's introspection work.</p>
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