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  24 </div>
  25 <div class="section">
  26 <div class="titlepage"><div><div><h3 class="title">
  27 <a name="boost_test.testing_tools.exception_correctness"></a><a class="link" href="exception_correctness.html" title="Exception correctness">Exception
  28       correctness</a>
  29 </h3></div></div></div>
  30 <p>
  31         Any unexpected/uncaught exception raised in the test case body will be intercepted
  32         by the Boost.test framework and will result in the termination of the test-case
  33         with the status <code class="computeroutput"><span class="identifier">failed</span></code>.
  34       </p>
  35 <h6>
  36 <a name="boost_test.testing_tools.exception_correctness.h0"></a>
  37         <span class="phrase"><a name="boost_test.testing_tools.exception_correctness.example_descr"></a></span><a class="link" href="exception_correctness.html#boost_test.testing_tools.exception_correctness.example_descr">Example:
  38         Uncaught exception</a>
  39       </h6>
  40 <div class="informaltable"><table class="table">
  41 <colgroup><col></colgroup>
  42 <thead><tr><th>
  43                 <p>
  44                   Code
  45                 </p>
  46               </th></tr></thead>
  47 <tbody><tr><td>
  48 <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>
  49 <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>
  50
  51 <span class="keyword">struct</span> <span class="identifier">my_struct</span> <span class="special">{</span>
  52   <span class="identifier">my_struct</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">var_</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">var</span><span class="special">(</span><span class="identifier">var_</span><span class="special">)</span>
  53   <span class="special">{</span>
  54     <span class="keyword">if</span><span class="special">(</span><span class="identifier">var_</span> <span class="special">&lt;</span> <span class="number">0</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">"negative value not allowed"</span><span class="special">);</span>
  55   <span class="special">}</span>
  56   <span class="keyword">int</span> <span class="identifier">var</span><span class="special">;</span>
  57 <span class="special">};</span>
  58
  59 <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test</span> <span class="special">)</span>
  60 <span class="special">{</span>
  61   <span class="identifier">my_struct</span> <span class="identifier">instance</span><span class="special">(-</span><span class="number">2</span><span class="special">);</span>
  62   <span class="comment">// ...</span>
  63 <span class="special">}</span>
  64
  65 <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test2</span> <span class="special">)</span>
  66 <span class="special">{</span>
  67   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="keyword">true</span><span class="special">);</span>
  68 <span class="special">}</span>
  69 </pre>
  70               </td></tr></tbody>
  71 </table></div>
  72 <div class="informaltable"><table class="table">
  73 <colgroup><col></colgroup>
  74 <thead><tr><th>
  75                 <p>
  76                   Output
  77                 </p>
  78               </th></tr></thead>
  79 <tbody><tr><td>
  80 <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="special">--</span><span class="identifier">log_level</span><span class="special">=</span><span class="identifier">all</span>
  81 <span class="identifier">Running</span> <span class="number">2</span> <span class="identifier">test</span> <span class="identifier">cases</span><span class="special">...</span>
  82 <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"example"</span>
  83 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">20</span><span class="special">:</span> <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test"</span>
  84 <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"</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">negative</span> <span class="identifier">value</span> <span class="keyword">not</span> <span class="identifier">allowed</span>
  85 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">20</span><span class="special">:</span> <span class="identifier">last</span> <span class="identifier">checkpoint</span><span class="special">:</span> <span class="string">"test"</span> <span class="identifier">entry</span><span class="special">.</span>
  86 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">20</span><span class="special">:</span> <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">247u</span><span class="identifier">s</span>
  87 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">26</span><span class="special">:</span> <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test2"</span>
  88 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">28</span><span class="special">:</span> <span class="identifier">info</span><span class="special">:</span> <span class="identifier">check</span> <span class="keyword">true</span> <span class="identifier">has</span> <span class="identifier">passed</span>
  89 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">26</span><span class="special">:</span> <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test2"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">103u</span><span class="identifier">s</span>
  90 <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"example"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">492u</span><span class="identifier">s</span>
  91
  92 <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>
  93 </pre>
  94               </td></tr></tbody>
  95 </table></div>
  96 <p>
  97         More control over the exception correctness is often required, for instance
  98         to test that an expression is raising a specific exception, intentionally.
  99       </p>
 100 <p>
 101         The <span class="emphasis"><em>Unit Test Framework</em></span> provides several assertions
 102         for testing a code with respect to the exceptions correctness. The following
 103         assertions are available:
 104       </p>
 105 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 106 <li class="listitem">
 107             <a class="link" href="../utf_reference/testing_tool_ref/assertion_boost_level_no_throw.html" title="BOOST_&lt;level&gt;_NO_THROW"><code class="computeroutput"><span class="identifier">BOOST_</span><span class="special">&lt;</span><span class="identifier">level</span><span class="special">&gt;</span><span class="identifier">_NO_THROW</span></code></a> checks that no exception
 108             is raised from an expression,
 109           </li>
 110 <li class="listitem">
 111             <a class="link" href="../utf_reference/testing_tool_ref/assertion_boost_level_throw.html" title="BOOST_&lt;level&gt;_THROW"><code class="computeroutput"><span class="identifier">BOOST_</span><span class="special">&lt;</span><span class="identifier">level</span><span class="special">&gt;</span><span class="identifier">_THROW</span></code></a> checks that an expression
 112             raises an exception of a specific type
 113           </li>
 114 <li class="listitem">
 115             <a class="link" href="../utf_reference/testing_tool_ref/assertion_boost_level_exception.html" title="BOOST_&lt;level&gt;_EXCEPTION"><code class="computeroutput"><span class="identifier">BOOST_</span><span class="special">&lt;</span><span class="identifier">level</span><span class="special">&gt;</span><span class="identifier">_EXCEPTION</span></code></a> checks that an expression
 116             raises an exception of a specific type, a passes the exception instance
 117             to a predicate function for further validation (introspection for instance)
 118           </li>
 119 </ul></div>
 120 <p>
 121         The following example demonstrate how to use these tools to test the correct
 122         behavior of the API of <code class="computeroutput"><span class="identifier">FileWordHistogram</span></code>,
 123         in the constructor and the preconditions of the member function.
 124       </p>
 125 <h6>
 126 <a name="boost_test.testing_tools.exception_correctness.h1"></a>
 127         <span class="phrase"><a name="boost_test.testing_tools.exception_correctness.example_descr0"></a></span><a class="link" href="exception_correctness.html#boost_test.testing_tools.exception_correctness.example_descr0">Example:
 128         Exception correctness of an API</a>
 129       </h6>
 130 <div class="informaltable"><table class="table">
 131 <colgroup><col></colgroup>
 132 <thead><tr><th>
 133                 <p>
 134                   Code
 135                 </p>
 136               </th></tr></thead>
 137 <tbody><tr><td>
 138 <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>
 139 <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>
 140 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">stdexcept</span><span class="special">&gt;</span>
 141 <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">fstream</span><span class="special">&gt;</span>
 142
 143 <span class="comment">//! Computes the histogram of the words in a text file</span>
 144 <span class="keyword">class</span> <span class="identifier">FileWordHistogram</span>
 145 <span class="special">{</span>
 146 <span class="keyword">public</span><span class="special">:</span>
 147   <span class="comment">//!@throw std::exception if the file does not exist</span>
 148   <span class="identifier">FileWordHistogram</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">filename</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">is_processed</span><span class="special">(</span><span class="keyword">false</span><span class="special">),</span> <span class="identifier">fileStream_</span><span class="special">(</span><span class="identifier">filename</span><span class="special">)</span> <span class="special">{</span>
 149     <span class="keyword">if</span><span class="special">(!</span><span class="identifier">fileStream_</span><span class="special">.</span><span class="identifier">is_open</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">"Cannot open the file"</span><span class="special">);</span>
 150   <span class="special">}</span>
 151
 152   <span class="comment">//! @returns true on success, false otherwise</span>
 153   <span class="keyword">bool</span> <span class="identifier">process</span><span class="special">()</span> <span class="special">{</span>
 154     <span class="keyword">if</span><span class="special">(</span><span class="identifier">is_processed</span><span class="special">)</span> <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span>
 155
 156     <span class="comment">// ...</span>
 157     <span class="identifier">is_processed</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span>
 158     <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span>
 159   <span class="special">}</span>
 160
 161   <span class="comment">//!@pre process has been called with status success</span>
 162   <span class="comment">//!@throw std::logic_error if preconditions not met</span>
 163   <span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&gt;</span>
 164   <span class="identifier">result</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span>
 165     <span class="keyword">if</span><span class="special">(!</span><span class="identifier">is_processed</span><span class="special">)</span>
 166       <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">"\"process\" has not been called or was not successful"</span><span class="special">);</span>
 167     <span class="keyword">return</span> <span class="identifier">histogram</span><span class="special">;</span>
 168   <span class="special">}</span>
 169
 170 <span class="keyword">private</span><span class="special">:</span>
 171   <span class="keyword">bool</span> <span class="identifier">is_processed</span><span class="special">;</span>
 172   <span class="identifier">std</span><span class="special">::</span><span class="identifier">ifstream</span> <span class="identifier">fileStream_</span><span class="special">;</span>
 173   <span class="identifier">std</span><span class="special">::</span><span class="identifier">map</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">&gt;</span> <span class="identifier">histogram</span><span class="special">;</span>
 174 <span class="special">};</span>
 175
 176 <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_throw_behaviour</span> <span class="special">)</span>
 177 <span class="special">{</span>
 178   <span class="comment">// __FILE__ is accessible, no exception expected</span>
 179   <span class="identifier">BOOST_REQUIRE_NO_THROW</span><span class="special">(</span> <span class="identifier">FileWordHistogram</span><span class="special">(</span><span class="identifier">__FILE__</span><span class="special">)</span> <span class="special">);</span>
 180
 181   <span class="comment">// ".. __FILE__" does not exist, API says std::exception, and implementation</span>
 182   <span class="comment">// raises std::runtime_error child of std::exception</span>
 183   <span class="identifier">BOOST_CHECK_THROW</span><span class="special">(</span> <span class="identifier">FileWordHistogram</span><span class="special">(</span><span class="string">".."</span> <span class="identifier">__FILE__</span><span class="special">),</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">exception</span> <span class="special">);</span>
 184
 185   <span class="special">{</span>
 186     <span class="identifier">FileWordHistogram</span> <span class="identifier">instance</span><span class="special">(</span><span class="identifier">__FILE__</span><span class="special">);</span>
 187
 188     <span class="comment">// api says "std::logic_error", implementation is wrong.</span>
 189     <span class="comment">// std::runtime_error not a child of std::logic_error, not intercepted</span>
 190     <span class="comment">// here.</span>
 191     <span class="identifier">BOOST_CHECK_THROW</span><span class="special">(</span><span class="identifier">instance</span><span class="special">.</span><span class="identifier">result</span><span class="special">(),</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span><span class="special">);</span>
 192   <span class="special">}</span>
 193 <span class="special">}</span>
 194 </pre>
 195               </td></tr></tbody>
 196 </table></div>
 197 <div class="informaltable"><table class="table">
 198 <colgroup><col></colgroup>
 199 <thead><tr><th>
 200                 <p>
 201                   Output
 202                 </p>
 203               </th></tr></thead>
 204 <tbody><tr><td>
 205 <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="special">--</span><span class="identifier">log_level</span><span class="special">=</span><span class="identifier">all</span>
 206 <span class="identifier">Running</span> <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span><span class="special">...</span>
 207 <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"example"</span>
 208 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">47</span><span class="special">:</span> <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test_throw_behaviour"</span>
 209 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">50</span><span class="special">:</span> <span class="identifier">info</span><span class="special">:</span> <span class="identifier">check</span> <span class="char">'no exceptions thrown by FileWordHistogram("test")'</span> <span class="identifier">has</span> <span class="identifier">passed</span>
 210 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">54</span><span class="special">:</span> <span class="identifier">info</span><span class="special">:</span> <span class="identifier">check</span> <span class="char">'exception std::exception is caught'</span> <span class="identifier">has</span> <span class="identifier">passed</span>
 211 <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_throw_behaviour"</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="string">"process"</span> <span class="identifier">has</span> <span class="keyword">not</span> <span class="identifier">been</span> <span class="identifier">called</span> <span class="keyword">or</span> <span class="identifier">was</span> <span class="keyword">not</span> <span class="identifier">successful</span>
 212 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">62</span><span class="special">:</span> <span class="identifier">last</span> <span class="identifier">checkpoint</span>
 213 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">47</span><span class="special">:</span> <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test_throw_behaviour"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">533u</span><span class="identifier">s</span>
 214 <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"example"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">643u</span><span class="identifier">s</span>
 215
 216 <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>
 217 </pre>
 218               </td></tr></tbody>
 219 </table></div>
 220 <div class="note"><table border="0" summary="Note">
 221 <tr>
 222 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
 223 <th align="left">Note</th>
 224 </tr>
 225 <tr><td align="left" valign="top"><p>
 226           An <code class="computeroutput"><span class="identifier">assert</span><span class="special">(...)</span></code>
 227           might call <code class="computeroutput"><span class="identifier">abort</span><span class="special">()</span></code>:
 228           the use of the macros above may not be suitable for testing for <code class="computeroutput"><span class="identifier">assert</span></code>'s in a portable manner.
 229         </p></td></tr>
 230 </table></div>
 231 <h5>
 232 <a name="boost_test.testing_tools.exception_correctness.h2"></a>
 233         <span class="phrase"><a name="boost_test.testing_tools.exception_correctness.bibliographic_references"></a></span><a class="link" href="exception_correctness.html#boost_test.testing_tools.exception_correctness.bibliographic_references">Bibliographic
 234         references</a>
 235       </h5>
 236 <div class="variablelist">
 237 <p class="title"><b>Publications</b></p>
 238 <dl class="variablelist">
 239 <dt><span class="term"><a href="https://isocpp.org/wiki/faq/exceptions" target="_top">Exceptions and
 240           Error Handling</a></span></dt>
 241 <dd><p>
 242               Standard C++ Foundation
 243             </p></dd>
 244 </dl>
 245 </div>
 246 </div>
 247 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 248 <td align="left"></td>
 249 <td align="right"><div class="copyright-footer">Copyright &#169; 2001-2019 Boost.Test
 250       contributors<p>
 251         Distributed under the Boost Software License, Version 1.0. (See accompanying
 252         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>)
 253       </p>
 254 </div></td>
 255 </tr></table>
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