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<td >Qt 5.12</td><td ><a href="qttest-index.html">Qt Test</a></td><td ><a href="qttest-module.html">C++ Classes</a></td><td >QAbstractItemModelTester</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#public-types">Public Types</a></li>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#static-public-members">Static Public Members</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
<li class="level2"><a href="#usage">Usage</a></li>
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<h1 class="title">QAbstractItemModelTester Class</h1>
<!-- $$$QAbstractItemModelTester-brief -->
<p>The <a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> class helps testing <a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a> subclasses. <a href="#details">More...</a></p>
<!-- @@@QAbstractItemModelTester -->
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign">   <span class="preprocessor">#include &lt;QAbstractItemModelTester&gt;</span>
</td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> QT += testlib</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign">  Qt 5.11</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherits:</td><td class="memItemRight bottomAlign"> <a href="../qtcore/qobject.html">QObject</a></td></tr></table></div><ul>
<li><a href="qabstractitemmodeltester-members.html">List of all members, including inherited members</a></li>
<li><a href="qabstractitemmodeltester-obsolete.html">Obsolete members</a></li>
</ul>
<a name="public-types"></a>
<h2 id="public-types">Public Types</h2>
<div class="table"><table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> enum </td><td class="memItemRight bottomAlign"><b><a href="qabstractitemmodeltester.html#FailureReportingMode-enum">FailureReportingMode</a></b> { QtTest, Warning, Fatal }</td></tr>
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<a name="public-functions"></a>
<h2 id="public-functions">Public Functions</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qabstractitemmodeltester.html#QAbstractItemModelTester">QAbstractItemModelTester</a></b>(QAbstractItemModel *<i>model</i>, QObject *<i>parent</i> = nullptr)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qabstractitemmodeltester.html#QAbstractItemModelTester-1">QAbstractItemModelTester</a></b>(QAbstractItemModel *<i>model</i>, QAbstractItemModelTester::FailureReportingMode <i>mode</i>, QObject *<i>parent</i> = nullptr)</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QAbstractItemModelTester::FailureReportingMode </td><td class="memItemRight bottomAlign"><b><a href="qabstractitemmodeltester.html#failureReportingMode">failureReportingMode</a></b>() const</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> QAbstractItemModel *</td><td class="memItemRight bottomAlign"><b><a href="qabstractitemmodeltester.html#model">model</a></b>() const</td></tr>
</table></div>
<ul>
<li class="fn">31 public functions inherited from <a href="../qtcore/qobject.html#public-functions">QObject</a></li>
</ul>
<a name="static-public-members"></a>
<h2 id="static-public-members">Static Public Members</h2>
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<tr><td class="memItemLeft rightAlign topAlign"> const QMetaObject </td><td class="memItemRight bottomAlign"><b><a href="qabstractitemmodeltester.html#staticMetaObject-var">staticMetaObject</a></b></td></tr>
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<li class="fn">9 static public members inherited from <a href="../qtcore/qobject.html#static-public-members">QObject</a></li>
</ul>
<h3>Additional Inherited Members</h3>
<ul>
<li class="fn">1 property inherited from <a href="../qtcore/qobject.html#properties">QObject</a></li>
<li class="fn">1 public slot inherited from <a href="../qtcore/qobject.html#public-slots">QObject</a></li>
<li class="fn">2 signals inherited from <a href="../qtcore/qobject.html#signals">QObject</a></li>
<li class="fn">9 protected functions inherited from <a href="../qtcore/qobject.html#protected-functions">QObject</a></li>
</ul>
<a name="details"></a>
<!-- $$$QAbstractItemModelTester-description -->
<div class="descr">
<h2 id="details">Detailed Description</h2>
<p>The <a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> class helps testing <a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a> subclasses.</p>
<p>The <a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> class is a utility class to test item models.</p>
<p>When implementing an item model (that is, a concrete <a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a> subclass) one must abide to a very strict set of rules that ensure consistency for users of the model (views, proxy models, and so on).</p>
<p>For instance, for a given index, a model's reimplementation of <a href="../qtcore/qabstractitemmodel.html#hasChildren">hasChildren()</a> must be consistent with the values returned by <a href="../qtcore/qabstractitemmodel.html#rowCount">rowCount()</a> and <a href="../qtcore/qabstractitemmodel.html#columnCount">columnCount()</a>.</p>
<p><a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> helps catching the most common errors in custom item model classes. By performing a series of tests, it will try to check that the model status is consistent at all times. The tests will be repeated automatically every time the model is modified.</p>
<p><a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> employs non-destructive tests, which typically consist in reading data and metadata out of a given item model. <a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> will also attempt illegal modifications of the model. In models which are properly implemented, such attempts should be rejected, and no data should be changed as a consequence.</p>
<a name="usage"></a>
<h3 id="usage">Usage</h3>
<p>Using <a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> is straightforward. In a <a href="qtest-overview.html">test case</a> it is sufficient to create an instance, passing the model that needs to be tested to the constructor:</p>
<pre class="cpp">

  MyModel <span class="operator">*</span>modelToBeTested <span class="operator">=</span> <span class="operator">.</span><span class="operator">.</span><span class="operator">.</span>;
  <span class="keyword">auto</span> tester <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qabstractitemmodeltester.html#QAbstractItemModelTester">QAbstractItemModelTester</a></span>(modelToBeTested);

</pre>
<p><a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> will report testing failures through the Qt Test logging mechanisms.</p>
<p>It is also possible to use <a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> outside of a test case. For instance, it may be useful to test an item model used by an application without the need of building an explicit unit test for such a model (which might be challenging). In order to use <a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> outside of a test case, pass one of the <code>QAbstractItemModelTester::FailureReportingMode</code> enumerators to its constructor, therefore specifying how failures should be logged.</p>
<p><a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> may also report additional debugging information as logging messages under the <code>qt.modeltest</code> logging category. Such debug logging is disabled by default; refer to the <a href="../qtcore/qloggingcategory.html">QLoggingCategory</a> documentation to learn how to enable it.</p>
<p><b>Note: </b>While <a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> is a valid help for development and testing of custom item models, it does not (and cannot) catch all possible problems in <a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a> subclasses. Notably, it will never perform meaningful destructive testing of a model, which must be therefore tested separately.</p></div>
<p><b>See also </b><a href="../qtwidgets/model-view-programming.html">Model/View Programming</a> and <a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a>.</p>
<!-- @@@QAbstractItemModelTester -->
<div class="types">
<h2>Member Type Documentation</h2>
<!-- $$$FailureReportingMode$$$QtTest$$$Warning$$$Fatal -->
<h3 class="fn" id="FailureReportingMode-enum"><a name="FailureReportingMode-enum"></a>enum QAbstractItemModelTester::<span class="name">FailureReportingMode</span></h3>
<p>This enumeration specifies how <a href="qabstractitemmodeltester.html">QAbstractItemModelTester</a> should report a failure when it tests a <a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a> subclass.</p>
<div class="table"><table class="valuelist"><tr valign="top" class="odd"><th class="tblConst">Constant</th><th class="tblval">Value</th><th class="tbldscr">Description</th></tr>
<tr><td class="topAlign"><code>QAbstractItemModelTester::QtTest</code></td><td class="topAlign tblval"><code>0</code></td><td class="topAlign">The failures will be reported through <a href="qttest-module.html">QtTest</a>'s logging mechanism.</td></tr>
<tr><td class="topAlign"><code>QAbstractItemModelTester::Warning</code></td><td class="topAlign tblval"><code>1</code></td><td class="topAlign">The failures will be reported as warning messages in the <code>qt.modeltest</code> logging category.</td></tr>
<tr><td class="topAlign"><code>QAbstractItemModelTester::Fatal</code></td><td class="topAlign tblval"><code>2</code></td><td class="topAlign">A failure will cause immediate and abnormal program termination. The reason for the failure will be reported using <code>qFatal()</code>.</td></tr>
</table></div>
<!-- @@@FailureReportingMode -->
</div>
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QAbstractItemModelTester[overload1]$$$QAbstractItemModelTesterQAbstractItemModel*QObject* -->
<h3 class="fn" id="QAbstractItemModelTester"><a name="QAbstractItemModelTester"></a>QAbstractItemModelTester::<span class="name">QAbstractItemModelTester</span>(<span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> *<i>model</i>, <span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = nullptr)</h3>
<p>Creates a model tester instance, with the given <i>parent</i>, that will test the model <i>model</i>.</p>
<!-- @@@QAbstractItemModelTester -->
<!-- $$$QAbstractItemModelTester$$$QAbstractItemModelTesterQAbstractItemModel*QAbstractItemModelTester::FailureReportingModeQObject* -->
<h3 class="fn" id="QAbstractItemModelTester-1"><a name="QAbstractItemModelTester-1"></a>QAbstractItemModelTester::<span class="name">QAbstractItemModelTester</span>(<span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> *<i>model</i>, <span class="type"><a href="qabstractitemmodeltester.html#FailureReportingMode-enum">QAbstractItemModelTester::FailureReportingMode</a></span> <i>mode</i>, <span class="type"><a href="../qtcore/qobject.html#QObject">QObject</a></span> *<i>parent</i> = nullptr)</h3>
<p>Creates a model tester instance, with the given <i>parent</i>, that will test the model <i>model</i>, using the specified <i>mode</i> to report test failures.</p>
<p><b>See also </b><a href="qabstractitemmodeltester.html#FailureReportingMode-enum">QAbstractItemModelTester::FailureReportingMode</a>.</p>
<!-- @@@QAbstractItemModelTester -->
<!-- $$$failureReportingMode[overload1]$$$failureReportingMode -->
<h3 class="fn" id="failureReportingMode"><a name="failureReportingMode"></a><span class="type"><a href="qabstractitemmodeltester.html#FailureReportingMode-enum">QAbstractItemModelTester::FailureReportingMode</a></span> QAbstractItemModelTester::<span class="name">failureReportingMode</span>() const</h3>
<p>Returns the mode that this instancing is using to report test failures.</p>
<p><b>See also </b><a href="qabstractitemmodeltester.html#FailureReportingMode-enum">QAbstractItemModelTester::FailureReportingMode</a>.</p>
<!-- @@@failureReportingMode -->
<!-- $$$model[overload1]$$$model -->
<h3 class="fn" id="model"><a name="model"></a><span class="type"><a href="../qtcore/qabstractitemmodel.html">QAbstractItemModel</a></span> *QAbstractItemModelTester::<span class="name">model</span>() const</h3>
<p>Returns the model that this instance is testing.</p>
<!-- @@@model -->
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