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<title>Test module runner</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_test.adv_scenarios.test_module_runner_overview"></a><a class="link" href="test_module_runner_overview.html" title="Test module runner">Test
      module runner</a>
</h3></div></div></div>
<p>
        A <span class="emphasis"><em>test module runner</em></span> is an <span class="emphasis"><em>orchestrator</em></span>
        or a <span class="emphasis"><em>driver</em></span> that, given the test tree, ensures the test
        tree is initialized, tests are executed and necessary reports generated.
        It performs the following operations:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            initialize the test module using the supplied <a class="link" href="test_module_init_overview.html" title="Test module's initialization"><span class="emphasis"><em>initialization
            function</em></span></a>;
          </li>
<li class="listitem">
            select output media for the test log and the test results report;
          </li>
<li class="listitem">
            execute test cases as specified by run-time parameters;
          </li>
<li class="listitem">
            produce the test results report;
          </li>
<li class="listitem">
            generate the appropriate return code.
          </li>
</ul></div>
<p>
        The <span class="emphasis"><em>Unit Test Framework</em></span> comes with the default test
        runner. There is no need to call it explicitly. The default generated test
        module's <a class="link" href="entry_point_overview.html" title="Test module's entry point">entry
        point</a> invokes the default test runner. The default test runner is
        declared with the following signature:
      </p>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">unit_test</span> <span class="special">{</span>

  <span class="keyword">typedef</span> <span class="keyword">bool</span> <span class="special">(*</span><span class="identifier">init_unit_test_func</span><span class="special">)();</span>

  <span class="keyword">int</span> <span class="identifier">unit_test_main</span><span class="special">(</span> <span class="identifier">init_unit_test_func</span> <span class="identifier">init_func</span><span class="special">,</span> <span class="keyword">int</span> <span class="identifier">argc</span><span class="special">,</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">argv</span><span class="special">[]</span> <span class="special">);</span>

<span class="special">}</span> <span class="special">}</span>
</pre>
<p>
        The test runner may return one of the following values:
      </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Value
                </p>
              </th>
<th>
                <p>
                  Meaning
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">exit_success</span></code>
                </p>
              </td>
<td>
                <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                      No errors occurred during testing, or
                    </li>
<li class="listitem">
                      the success result was forced with command-line argument <code class="computeroutput"><span class="special">--[</span><span class="identifier">link</span>
                      <span class="identifier">boost_test</span><span class="special">.</span><span class="identifier">utf_reference</span><span class="special">.</span><span class="identifier">rt_param_reference</span><span class="special">.</span><span class="identifier">result_code</span> </code>result_code<code class="computeroutput"><span class="special">]=</span><span class="identifier">no</span></code>.
                    </li>
</ul></div>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">exit_test_failure</span></code>
                </p>
              </td>
<td>
                <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                      Non-fatal errors detected and no uncaught exceptions were thrown
                      during testing, or
                    </li>
<li class="listitem">
                      the initialization of the <span class="emphasis"><em>Unit Test Framework</em></span>
                      failed.
                    </li>
</ul></div>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">exit_exception_failure</span></code>
                </p>
              </td>
<td>
                <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                      Fatal errors were detected, or
                    </li>
<li class="listitem">
                      uncaught exceptions thrown during testing.
                    </li>
</ul></div>
              </td>
</tr>
</tbody>
</table></div>
<p>
        An advanced test runner may provide additional features, including interactive
        GUI interfaces, test coverage and profiling support.
      </p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2001-2019 Boost.Test
      contributors<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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