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<li class="level1"><a href="#writing-a-gui-test">Writing a GUI test</a></li>
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<h1 class="title">Chapter 3: Simulating GUI Events</h1>
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<p><a href="qtestlib-manual.html#qtestlib">QTestLib</a> features some mechanisms to test graphical user interfaces. Instead of simulating native window system events, <a href="qtestlib-manual.html#qtestlib">QTestLib</a> sends internal Qt events. That means there are no side-effects on the machine the tests are running on.</p>
<p>In this chapter we will se how to write a simple GUI test.</p>
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<h2>Writing a GUI test</h2>
<p>This time, let's assume you want to test the behavior of our <a href="qlineedit.html">QLineEdit</a> class. As before, you will need a class that contains your test function:</p>
<pre class="cpp"> <span class="preprocessor">#include <QtGui></span>
<span class="preprocessor">#include <QtTest/QtTest></span>
<span class="keyword">class</span> TestGui: <span class="keyword">public</span> <span class="type"><a href="qobject.html">QObject</a></span>
{
Q_OBJECT
<span class="keyword">private</span> <span class="keyword">slots</span>:
<span class="type">void</span> testGui();
};</pre>
<p>The only difference is that you need to include the <a href="qtgui.html">QtGui</a> class definitions in addition to the <a href="qtest.html">QTest</a> namespace.</p>
<pre class="cpp"> <span class="type">void</span> TestGui<span class="operator">::</span>testGui()
{
<span class="type"><a href="qlineedit.html">QLineEdit</a></span> lineEdit;
<span class="type"><a href="qtest.html">QTest</a></span><span class="operator">::</span>keyClicks(<span class="operator">&</span>lineEdit<span class="operator">,</span> <span class="string">"hello world"</span>);
QCOMPARE(lineEdit<span class="operator">.</span>text()<span class="operator">,</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">"hello world"</span>));
}</pre>
<p>In the implementation of the test function we first create a <a href="qlineedit.html">QLineEdit</a>. Then we simulate writing "hello world" in the line edit using the <a href="qtest.html#keyClicks">QTest::keyClicks</a>() function.</p>
<p><b>Note:</b> The widget must also be shown in order to correctly test keyboard shortcuts.</p>
<p><a href="qtest.html#keyClicks">QTest::keyClicks</a>() simulates clicking a sequence of keys on a widget. Optionally, a keyboard modifier can be specified as well as a delay (in milliseconds) of the test after each key click. In a similar way, you can use the <a href="qtest.html#keyClick">QTest::keyClick</a>(), <a href="qtest.html#keyPress">QTest::keyPress</a>(), <a href="qtest.html#keyRelease">QTest::keyRelease</a>(), <a href="qtest.html#mouseClick">QTest::mouseClick</a>(), <a href="qtest.html#mouseDClick">QTest::mouseDClick</a>(), <a href="qtest.html#mouseMove">QTest::mouseMove</a>(), <a href="qtest.html#mousePress">QTest::mousePress</a>() and <a href="qtest.html#mouseRelease">QTest::mouseRelease</a>() functions to simulate the associated GUI events.</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 class="cpp"> <a href="qtest.html#QTEST_MAIN">QTEST_MAIN</a>(TestGui)
<span class="preprocessor">#include "testgui.moc"</span></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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