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<section id="debugging-unit-tests">
<h1>Debugging Unit Tests<a class="headerlink" href="#debugging-unit-tests" title="Link to this heading">#</a></h1>
<nav class="contents local" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#using-gdb" id="id2">Using gdb</a></p></li>
<li><p><a class="reference internal" href="#within-eclipse" id="id3">Within Eclipse</a></p></li>
<li><p><a class="reference internal" href="#within-visual-studio-debugging-run-method" id="id4">Within Visual Studio (debugging run method)</a></p></li>
<li><p><a class="reference internal" href="#within-visual-studio-attach-to-process-version" id="id5">Within Visual Studio (attach to process version)</a></p></li>
</ul>
</nav>
<section id="using-gdb">
<h2><a class="toc-backref" href="#id2" role="doc-backlink">Using gdb</a><a class="headerlink" href="#using-gdb" title="Link to this heading">#</a></h2>
<p>Debugging typically requires the test executable to be run directly,
rather than via ctest (which typically spawns off a separate process to
run the actual tests). So an example of debugging test function
<code class="docutils literal notranslate"><span class="pre">testworkspace1D_dist</span></code> of Suite <code class="docutils literal notranslate"><span class="pre">RebinTest</span></code> from the command line
using gdb would be:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ gdb bin/AlgorithmsTest
(gdb) r RebinTest testworkspace1D_dist
</pre></div>
</div>
<p>If you do need to run ctest in order to debug - if, for example, a test
is failing when run in ctest, but not if run directly - then you can
start the test off and then attach to the actual test executable from
another terminal (or your IDE). You may need to pause or slow down the
test using, e.g., the method described for Visual Studio debugging
below.</p>
<p>If the issue is with a python unit test, the call is slightly more
complicated:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ env PYTHONPATH=$PWD/bin gdb --args python /full/path/to/mantid/Framework/PythonInterface/test/python/mantid/kernel/TimeSeriesPropertyTest.py
(gdb) run
</pre></div>
</div>
</section>
<section id="within-eclipse">
<h2><a class="toc-backref" href="#id3" role="doc-backlink">Within Eclipse</a><a class="headerlink" href="#within-eclipse" title="Link to this heading">#</a></h2>
<ol class="arabic simple">
<li><p>Go to Run->Debug Configurations</p></li>
<li><p>Create a new Debug Configuration. I called mine “DataHandling Test
Debug”.</p></li>
<li><p>For me, it worked best using the “Standard Create Process Launcher”
(bottom option on the “Main” tab)</p></li>
<li><p>Set the C/C++ application to the path to the test executable, e.g.
bin/DataHandlingTest</p></li>
<li><p>Under the “Arguments” tab, add the name of the test class you want to
debug under “Program arguments”, e.g. LoadTest</p>
<ol class="arabic simple">
<li><p>To only run one test in a class, you can add the particular test
to run, e.g. “LoadTest test_exec”</p></li>
</ol>
</li>
<li><p>Under “Common” you can put the debug config in your “favorites” menu.</p></li>
</ol>
<p>You can then run the debugger on this configuration from the Run menu or
the toolbar.</p>
</section>
<section id="within-visual-studio-debugging-run-method">
<h2><a class="toc-backref" href="#id4" role="doc-backlink">Within Visual Studio (debugging run method)</a><a class="headerlink" href="#within-visual-studio-debugging-run-method" title="Link to this heading">#</a></h2>
<p>I’ve found that this method works with Visual Studio Express (which does
not allow “attach to process”).</p>
<ul class="simple">
<li><p>Right-click the test project, e.g. DataObjectsTest.</p></li>
<li><p>Select Properties.</p>
<ul>
<li><p>Under Debugging -> Command Arguments, type in the test suite and,
optionally, single test name. e.g. “EventListTest
test_MinusOperator_inPlace_3cases” in the screenshot below.</p></li>
</ul>
</li>
</ul>
<figure class="align-default" id="id1">
<img alt="VisualStudioTestDebugProperties.png" src="_images/VisualStudioTestDebugProperties.png" />
<figcaption>
<p><span class="caption-text">VisualStudioTestDebugProperties.png</span><a class="headerlink" href="#id1" title="Link to this image">#</a></p>
</figcaption>
</figure>
<ul class="simple">
<li><p>Put a break point somewhere in the test code that will be run.</p></li>
<li><p>Select the project and click Debug -> Start Debugging.</p></li>
<li><p>Fun test debugging times!</p></li>
</ul>
</section>
<section id="within-visual-studio-attach-to-process-version">
<h2><a class="toc-backref" href="#id5" role="doc-backlink">Within Visual Studio (attach to process version)</a><a class="headerlink" href="#within-visual-studio-attach-to-process-version" title="Link to this heading">#</a></h2>
<p>The process here is not as straight forward as it is in eclipse. It
involves a few steps, but it does work!</p>
<p>1. Edit the test to add a pause at the start of the test you are
interested in. This will make the test wait for keyboard input, all you
need to do is hit enter, but you can use this delay to attach to the
debugger to running process.</p>
<div class="highlight-c++ notranslate"><div class="highlight"><pre><span></span><span class="n">std</span><span class="o">::</span><span class="n">string</span><span class="w"> </span><span class="n">s</span><span class="p">;</span>
<span class="n">std</span><span class="o">::</span><span class="n">getline</span><span class="p">(</span><span class="n">std</span><span class="o">::</span><span class="n">cin</span><span class="p">,</span><span class="w"> </span><span class="n">s</span><span class="p">);</span>
</pre></div>
</div>
<div class="line-block">
<div class="line">2. Run ctest with the appropriate arguments to run the test you are
investigating.</div>
<div class="line">3. When the test pauses for input within visual studio select
DebugAttach to Process… <img alt="AttachToProcess.png" src="_images/AttachToProcess.png" /></div>
<div class="line">4. Select the test executable (e.g. DataHandlingTest.exe) from the
list and click attach. Visual studio will change to debug mode.</div>
<div class="line">5. Set any breakpoints you want, go back to the runner.exe window and
hit enter to stop the pause. This should then ctach on any breakpoints
you have set.</div>
<div class="line">6. VERY IMPORTANT - Clean up when you have done, and do not check in
with any paused tests!</div>
</div>
</section>
</section>
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