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<title>Checkpoints for accurate failure location</title>
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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_test.test_output.test_tools_support_for_logging.checkpoints"></a><a class="link" href="checkpoints.html" title="Checkpoints for accurate failure location">Checkpoints
        for accurate failure location</a>
</h4></div></div></div>
<p>
          In most cases, the <span class="emphasis"><em>Unit Test Framework</em></span> can't provide
          an exact location where system error occurs or uncaught C++ exception is
          thrown from. To be able to pinpoint it as close as possible the <span class="emphasis"><em>Unit
          Test Framework</em></span> keeps track of <span class="bold"><strong>checkpoints</strong></span>
          - the location a test module passed through.
        </p>
<p>
          The <span class="emphasis"><em>Unit Test Framework</em></span> keeps track of checkpoints
          at test case entrance, exit, fixture initialization, and at test tool invocation
          point.
        </p>
<p>
          Any other checkpoints should be entered by you manually if you need more
          granularity in case a fatal error occurs during the test. The <span class="emphasis"><em>Unit
          Test Framework</em></span> provides two macros for this purpose:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              <a class="link" href="checkpoints.html#ref_named_checkpoint"><code class="computeroutput"><span class="identifier">BOOST_TEST_CHECKPOINT</span></code></a>
              to specify a <span class="emphasis"><em>named</em></span> checkpoint and
            </li>
<li class="listitem">
              <a class="link" href="checkpoints.html#ref_unnamed_checkpoint"><code class="computeroutput"><span class="identifier">BOOST_TEST_PASSPOINT</span></code></a>
              to specify an <span class="emphasis"><em>unnamed</em></span> checkpoint.
            </li>
</ul></div>
<p>
          The checkpoints are also convenient for checks in loops as they might provide
          more information about the occurrence of a failure (although superseded
          by [links boost_test.test_output.test_tools_support_for_logging.contexts
          contexts]).
        </p>
<a name="ref_named_checkpoint"></a><h4>
<a name="boost_test.test_output.test_tools_support_for_logging.checkpoints.h0"></a>
          <span class="phrase"><a name="boost_test.test_output.test_tools_support_for_logging.checkpoints.named_checkpoints"></a></span><a class="link" href="checkpoints.html#boost_test.test_output.test_tools_support_for_logging.checkpoints.named_checkpoints">Named
          checkpoints</a>
        </h4>
<p>
          The macro <a class="link" href="../../utf_reference/testout_reference/test_output_macro_checkpoint.html" title="BOOST_TEST_CHECKPOINT"><code class="computeroutput"><span class="identifier">BOOST_TEST_CHECKPOINT</span></code></a> is intended
          to be used to inject <span class="bold"><strong>named</strong></span> checkpoint
          position. The macro signature is as follows:
        </p>
<pre class="programlisting"><a class="link" href="../../utf_reference/testout_reference/test_output_macro_checkpoint.html" title="BOOST_TEST_CHECKPOINT"><code class="computeroutput"><span class="identifier">BOOST_TEST_CHECKPOINT</span></code></a><span class="special">(</span><span class="identifier">checkpoint_message</span><span class="special">);</span>
</pre>
<p>
          The message formatted at the checkpoint position is saved and reported
          by the exception logging functions (if any occurs). Similarly to the <a class="link" href="../../utf_reference/testout_reference/test_output_macro_message.html" title="BOOST_TEST_MESSAGE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MESSAGE</span></code></a> the message
          can be formatted from any standard output stream compliant components.
        </p>
<h6>
<a name="boost_test.test_output.test_tools_support_for_logging.checkpoints.h1"></a>
          <span class="phrase"><a name="boost_test.test_output.test_tools_support_for_logging.checkpoints.example_descr"></a></span><a class="link" href="checkpoints.html#boost_test.test_output.test_tools_support_for_logging.checkpoints.example_descr">Example:
          <code class="computeroutput"><span class="identifier">BOOST_TEST_CHECKPOINT</span></code> usage</a>
        </h6>
<div class="informaltable"><table class="table">
<colgroup><col></colgroup>
<thead><tr><th>
                  <p>
                    Code
                  </p>
                </th></tr></thead>
<tbody><tr><td>
<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">example</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">extern</span> <span class="keyword">void</span> <span class="identifier">foo</span><span class="special">(</span> <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">);</span>

<span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_external_interface</span> <span class="special">)</span>
<span class="special">{</span>
  <span class="keyword">for</span><span class="special">(</span> <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">=</span> <span class="number">3</span><span class="special">;</span> <span class="identifier">i</span> <span class="special">&gt;=</span><span class="number">0</span><span class="special">;</span> <span class="identifier">i</span><span class="special">--</span> <span class="special">)</span> <span class="special">{</span>
    <span class="identifier">BOOST_TEST_CHECKPOINT</span><span class="special">(</span> <span class="string">"Calling 'foo' with i="</span> <span class="special">&lt;&lt;</span> <span class="identifier">i</span> <span class="special">);</span>
    <span class="identifier">foo</span><span class="special">(</span> <span class="identifier">i</span> <span class="special">);</span>
  <span class="special">}</span>
<span class="special">}</span>

<span class="keyword">void</span> <span class="identifier">goo</span><span class="special">(</span> <span class="keyword">int</span> <span class="identifier">value</span> <span class="special">)</span>
<span class="special">{</span>
  <span class="identifier">BOOST_TEST_CHECKPOINT</span><span class="special">(</span> <span class="string">"Inside goo with value '"</span> <span class="special">&lt;&lt;</span> <span class="identifier">value</span> <span class="special">&lt;&lt;</span> <span class="string">"'"</span><span class="special">);</span>
<span class="special">}</span>

<span class="keyword">void</span> <span class="identifier">foo</span><span class="special">(</span> <span class="keyword">int</span> <span class="identifier">i</span> <span class="special">)</span>
<span class="special">{</span>
  <span class="keyword">if</span><span class="special">(</span> <span class="identifier">i</span> <span class="special">==</span> <span class="number">1</span> <span class="special">)</span>
      <span class="keyword">throw</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span><span class="special">(</span><span class="string">"Undefined Behaviour ahead!"</span><span class="special">);</span>
  <span class="comment">// following line may not raise an exception on some compilers:</span>
  <span class="comment">// Undefined Behaviour is implementation specific</span>
  <span class="identifier">goo</span><span class="special">(</span> <span class="number">2</span><span class="special">/(</span><span class="identifier">i</span><span class="special">-</span><span class="number">1</span><span class="special">)</span> <span class="special">);</span>
<span class="special">}</span>
</pre>
                </td></tr></tbody>
</table></div>
<div class="informaltable"><table class="table">
<colgroup><col></colgroup>
<thead><tr><th>
                  <p>
                    Output
                  </p>
                </th></tr></thead>
<tbody><tr><td>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="identifier">example</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">"test_external_interface"</span><span class="special">:</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">runtime_error</span><span class="special">:</span> <span class="identifier">Undefined</span> <span class="identifier">Behaviour</span> <span class="identifier">ahead</span><span class="special">!</span>
<span class="special">../</span><span class="identifier">doc</span><span class="special">/</span><span class="identifier">examples</span><span class="special">/</span><span class="identifier">example22</span><span class="special">.</span><span class="identifier">run</span><span class="special">-</span><span class="identifier">fail</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">17</span><span class="special">):</span> <span class="identifier">last</span> <span class="identifier">checkpoint</span><span class="special">:</span> <span class="identifier">Calling</span> <span class="char">'foo'</span> <span class="identifier">with</span> <span class="identifier">i</span><span class="special">=</span><span class="number">1</span>

<span class="special">***</span> <span class="number">1</span> <span class="identifier">failure</span> <span class="identifier">is</span> <span class="identifier">detected</span> <span class="identifier">in</span> <span class="identifier">the</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"example"</span>
</pre>
                </td></tr></tbody>
</table></div>
<a name="ref_unnamed_checkpoint"></a><h4>
<a name="boost_test.test_output.test_tools_support_for_logging.checkpoints.h2"></a>
          <span class="phrase"><a name="boost_test.test_output.test_tools_support_for_logging.checkpoints.unnamed_checkpoints"></a></span><a class="link" href="checkpoints.html#boost_test.test_output.test_tools_support_for_logging.checkpoints.unnamed_checkpoints">Unnamed
          checkpoints</a>
        </h4>
<p>
          The macro <a class="link" href="../../utf_reference/testout_reference/test_output_macro_passpoint.html" title="BOOST_TEST_PASSPOINT"><code class="computeroutput"><span class="identifier">BOOST_TEST_PASSPOINT</span></code></a> is intended
          to be used to inject an <span class="bold"><strong>unnamed</strong></span> checkpoint
          position. The macro signature is as follows:
        </p>
<pre class="programlisting"><a class="link" href="../../utf_reference/testout_reference/test_output_macro_passpoint.html" title="BOOST_TEST_PASSPOINT"><code class="computeroutput"><span class="identifier">BOOST_TEST_PASSPOINT</span></code></a><span class="special">();</span>
</pre>
<p>
          Unlike the macro <a class="link" href="../../utf_reference/testout_reference/test_output_macro_checkpoint.html" title="BOOST_TEST_CHECKPOINT"><code class="computeroutput"><span class="identifier">BOOST_TEST_CHECKPOINT</span></code></a> this macro
          doesn't require any message to be supplied with it. It's just a simple
          "been there" marker that records file name and line number code
          passes through.
        </p>
<h6>
<a name="boost_test.test_output.test_tools_support_for_logging.checkpoints.h3"></a>
          <span class="phrase"><a name="boost_test.test_output.test_tools_support_for_logging.checkpoints.example_descr0"></a></span><a class="link" href="checkpoints.html#boost_test.test_output.test_tools_support_for_logging.checkpoints.example_descr0">Example:
          <code class="computeroutput"><span class="identifier">BOOST_TEST_PASSPOINT</span></code> usage</a>
        </h6>
<div class="informaltable"><table class="table">
<colgroup><col></colgroup>
<thead><tr><th>
                  <p>
                    Code
                  </p>
                </th></tr></thead>
<tbody><tr><td>
<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">example</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">void</span> <span class="identifier">foo</span><span class="special">(</span> <span class="keyword">int</span> <span class="identifier">value</span> <span class="special">)</span> <span class="special">{</span>
  <span class="identifier">BOOST_TEST_CHECKPOINT</span><span class="special">(</span><span class="string">"Inside foo with value '"</span> <span class="special">&lt;&lt;</span> <span class="identifier">value</span> <span class="special">&lt;&lt;</span> <span class="string">"' (should not be there)"</span><span class="special">);</span>
<span class="special">}</span>

<span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_case</span> <span class="special">)</span>
<span class="special">{</span>
  <span class="keyword">int</span><span class="special">*</span> <span class="identifier">p</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>

  <span class="identifier">BOOST_TEST_PASSPOINT</span><span class="special">();</span>
  <span class="special">++</span><span class="identifier">p</span><span class="special">;</span>

  <span class="identifier">BOOST_TEST_PASSPOINT</span><span class="special">();</span>
  <span class="special">++</span><span class="identifier">p</span><span class="special">;</span>

  <span class="identifier">BOOST_TEST_PASSPOINT</span><span class="special">();</span>
  <span class="identifier">foo</span><span class="special">(</span> <span class="special">*</span><span class="identifier">p</span> <span class="special">);</span>
<span class="special">}</span>
</pre>
                </td></tr></tbody>
</table></div>
<div class="informaltable"><table class="table">
<colgroup><col></colgroup>
<thead><tr><th>
                  <p>
                    Output
                  </p>
                </th></tr></thead>
<tbody><tr><td>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="identifier">example</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="identifier">in</span> <span class="string">"test_case"</span><span class="special">:</span> <span class="identifier">memory</span> <span class="identifier">access</span> <span class="identifier">violation</span> <span class="identifier">at</span> <span class="identifier">address</span><span class="special">:</span> <span class="number">0x00000008</span><span class="special">:</span> <span class="identifier">no</span> <span class="identifier">mapping</span> <span class="identifier">at</span> <span class="identifier">fault</span> <span class="identifier">address</span>
<span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">16</span><span class="special">):</span> <span class="identifier">last</span> <span class="identifier">checkpoint</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">suite</span> <span class="string">"example"</span>
</pre>
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