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<title>Time-out for test cases</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_test.testing_tools.timeout"></a><a class="link" href="timeout.html" title="Time-out for test cases">Time-out for test cases</a>
</h3></div></div></div>
<p>
        The <span class="emphasis"><em>Unit Test Framework</em></span> provides the decorator <a class="link" href="../utf_reference/testing_tool_ref/decorator_timeout.html" title="timeout (decorator)"><code class="computeroutput"><span class="identifier">timeout</span></code></a> that specifies a time-out
        for a specific <span class="bold"><strong>test unit</strong></span>. The argument time
        is always expressed in <span class="bold"><strong>seconds ans wall-clock</strong></span>
        time.
      </p>
<p>
        For test-cases, the time-out value sets the maximum allowed duration for
        the test. If this time is exceeded, the test case is reported as failed.
        On some systems, the <span class="emphasis"><em>Unit Test Framework</em></span> is able to
        force the test-case to stop through a <code class="computeroutput"><span class="identifier">SIGALRM</span></code>
        signal (see below).
      </p>
<p>
        For test-suites, the time-out value sets the maximum allowed duration for
        the entire suite to complete. This duration is the accumulated time of all
        the test-cases contained in the sub-tree rooted on the test-suite, plus some
        extra execution time needed by the <span class="emphasis"><em>Unit Test Framework</em></span>.
        For each test-units under a test-suite with time-out, the maximum allowed
        duration is set as being the test-suite time out minus the accumulated execution
        time before the execution of the test-unit. If this test-unit is a test-case,
        it is equivalent to setting the decorator <a class="link" href="../utf_reference/testing_tool_ref/decorator_timeout.html" title="timeout (decorator)"><code class="computeroutput"><span class="identifier">timeout</span></code></a> to the test-case with a
        time-out value expressed as before.
      </p>
<p>
        In case the test-suite times out, the suite is flagged as <code class="computeroutput"><span class="identifier">timed</span><span class="special">-</span><span class="identifier">out</span></code> and
        <code class="computeroutput"><span class="identifier">failed</span></code>, and all the test
        units (suites and cases) that have not been executed up to the time-out point
        are all skipped.
      </p>
<h6>
<a name="boost_test.testing_tools.timeout.h0"></a>
        <span class="phrase"><a name="boost_test.testing_tools.timeout.example_descr"></a></span><a class="link" href="timeout.html#boost_test.testing_tools.timeout.example_descr">Example:
        decorator timeout</a>
      </h6>
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<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#define</span> <span class="identifier">BOOST_TEST_MODULE</span> <span class="identifier">decorator_11</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">included</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="keyword">namespace</span> <span class="identifier">utf</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">;</span>

<span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test1</span><span class="special">,</span> <span class="special">*</span> <span class="identifier">utf</span><span class="special">::</span><span class="identifier">timeout</span><span class="special">(</span><span class="number">2</span><span class="special">))</span>
<span class="special">{</span>
<span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_SIGACTION_BASED_SIGNAL_HANDLING</span>
  <span class="keyword">for</span><span class="special">(;;)</span> <span class="special">{}</span>
  <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="keyword">true</span><span class="special">);</span>
<span class="preprocessor">#else</span>
  <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span>
<span class="preprocessor">#endif</span>
<span class="special">}</span>
</pre>
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<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="identifier">decorator_11</span>
<span class="identifier">Running</span> <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span><span class="special">...</span>
<span class="identifier">unknown</span> <span class="identifier">location</span><span class="special">(</span><span class="number">0</span><span class="special">):</span> <span class="identifier">fatal</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test1"</span><span class="special">:</span> <span class="identifier">signal</span><span class="special">:</span> <span class="identifier">SIGALRM</span> <span class="special">(</span><span class="identifier">timeout</span> <span class="keyword">while</span> <span class="identifier">executing</span> <span class="identifier">function</span><span class="special">)</span>
<span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">5</span><span class="special">):</span> <span class="identifier">last</span> <span class="identifier">checkpoint</span><span class="special">:</span> <span class="string">"test1"</span> <span class="identifier">entry</span><span class="special">.</span>

<span class="special">***</span> <span class="number">1</span> <span class="identifier">failures</span> <span class="identifier">is</span> <span class="identifier">detected</span> <span class="identifier">in</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"decorator_11"</span>
</pre>
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<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
          The macro <code class="computeroutput"><span class="identifier">BOOST_SIGACTION_BASED_SIGNAL_HANDLING</span></code>
          is defined if Boost.Test is able to force the test-case to stop. This feature
          is for instance not supported on Windows. The <span class="emphasis"><em>Unit Test Framework</em></span>
          will still be able to report the test-case as failed (once the test-case
          finishes).
        </p></td></tr>
</table></div>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
          The support of test suite level time-out has been added in <a class="link" href="../change_log.html#ref_CHANGE_LOG_3_10">Boost
          1.70 / <span class="emphasis"><em>Unit Test Framework</em></span> v3.10</a>
        </p></td></tr>
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