exception_correctness.html 27 KB

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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. <span class="keyword">struct</span> <span class="identifier">my_struct</span> <span class="special">{</span>
  51. <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>
  52. <span class="special">{</span>
  53. <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>
  54. <span class="special">}</span>
  55. <span class="keyword">int</span> <span class="identifier">var</span><span class="special">;</span>
  56. <span class="special">};</span>
  57. <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test</span> <span class="special">)</span>
  58. <span class="special">{</span>
  59. <span class="identifier">my_struct</span> <span class="identifier">instance</span><span class="special">(-</span><span class="number">2</span><span class="special">);</span>
  60. <span class="comment">// ...</span>
  61. <span class="special">}</span>
  62. <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test2</span> <span class="special">)</span>
  63. <span class="special">{</span>
  64. <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="keyword">true</span><span class="special">);</span>
  65. <span class="special">}</span>
  66. </pre>
  67. </td></tr></tbody>
  68. </table></div>
  69. <div class="informaltable"><table class="table">
  70. <colgroup><col></colgroup>
  71. <thead><tr><th>
  72. <p>
  73. Output
  74. </p>
  75. </th></tr></thead>
  76. <tbody><tr><td>
  77. <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>
  78. <span class="identifier">Running</span> <span class="number">2</span> <span class="identifier">test</span> <span class="identifier">cases</span><span class="special">...</span>
  79. <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"example"</span>
  80. <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>
  81. <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>
  82. <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>
  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">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>
  84. <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>
  85. <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>
  86. <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>
  87. <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>
  88. <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>
  89. </pre>
  90. </td></tr></tbody>
  91. </table></div>
  92. <p>
  93. More control over the exception correctness is often required, for instance
  94. to test that an expression is raising a specific exception, intentionally.
  95. </p>
  96. <p>
  97. The <span class="emphasis"><em>Unit Test Framework</em></span> provides several assertions
  98. for testing a code with respect to the exceptions correctness. The following
  99. assertions are available:
  100. </p>
  101. <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  102. <li class="listitem">
  103. <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
  104. is raised from an expression,
  105. </li>
  106. <li class="listitem">
  107. <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
  108. raises an exception of a specific type
  109. </li>
  110. <li class="listitem">
  111. <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
  112. raises an exception of a specific type, a passes the exception instance
  113. to a predicate function for further validation (introspection for instance)
  114. </li>
  115. </ul></div>
  116. <p>
  117. The following example demonstrate how to use these tools to test the correct
  118. behavior of the API of <code class="computeroutput"><span class="identifier">FileWordHistogram</span></code>,
  119. in the constructor and the preconditions of the member function.
  120. </p>
  121. <h6>
  122. <a name="boost_test.testing_tools.exception_correctness.h1"></a>
  123. <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:
  124. Exception correctness of an API</a>
  125. </h6>
  126. <div class="informaltable"><table class="table">
  127. <colgroup><col></colgroup>
  128. <thead><tr><th>
  129. <p>
  130. Code
  131. </p>
  132. </th></tr></thead>
  133. <tbody><tr><td>
  134. <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>
  135. <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>
  136. <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">stdexcept</span><span class="special">&gt;</span>
  137. <span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">fstream</span><span class="special">&gt;</span>
  138. <span class="comment">//! Computes the histogram of the words in a text file</span>
  139. <span class="keyword">class</span> <span class="identifier">FileWordHistogram</span>
  140. <span class="special">{</span>
  141. <span class="keyword">public</span><span class="special">:</span>
  142. <span class="comment">//!@throw std::exception if the file does not exist</span>
  143. <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>
  144. <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>
  145. <span class="special">}</span>
  146. <span class="comment">//! @returns true on success, false otherwise</span>
  147. <span class="keyword">bool</span> <span class="identifier">process</span><span class="special">()</span> <span class="special">{</span>
  148. <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>
  149. <span class="comment">// ...</span>
  150. <span class="identifier">is_processed</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span>
  151. <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span>
  152. <span class="special">}</span>
  153. <span class="comment">//!@pre process has been called with status success</span>
  154. <span class="comment">//!@throw std::logic_error if preconditions not met</span>
  155. <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>
  156. <span class="identifier">result</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span>
  157. <span class="keyword">if</span><span class="special">(!</span><span class="identifier">is_processed</span><span class="special">)</span>
  158. <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>
  159. <span class="keyword">return</span> <span class="identifier">histogram</span><span class="special">;</span>
  160. <span class="special">}</span>
  161. <span class="keyword">private</span><span class="special">:</span>
  162. <span class="keyword">bool</span> <span class="identifier">is_processed</span><span class="special">;</span>
  163. <span class="identifier">std</span><span class="special">::</span><span class="identifier">ifstream</span> <span class="identifier">fileStream_</span><span class="special">;</span>
  164. <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>
  165. <span class="special">};</span>
  166. <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_throw_behaviour</span> <span class="special">)</span>
  167. <span class="special">{</span>
  168. <span class="comment">// __FILE__ is accessible, no exception expected</span>
  169. <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>
  170. <span class="comment">// ".. __FILE__" does not exist, API says std::exception, and implementation</span>
  171. <span class="comment">// raises std::runtime_error child of std::exception</span>
  172. <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>
  173. <span class="special">{</span>
  174. <span class="identifier">FileWordHistogram</span> <span class="identifier">instance</span><span class="special">(</span><span class="identifier">__FILE__</span><span class="special">);</span>
  175. <span class="comment">// api says "std::logic_error", implementation is wrong.</span>
  176. <span class="comment">// std::runtime_error not a child of std::logic_error, not intercepted</span>
  177. <span class="comment">// here.</span>
  178. <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>
  179. <span class="special">}</span>
  180. <span class="special">}</span>
  181. </pre>
  182. </td></tr></tbody>
  183. </table></div>
  184. <div class="informaltable"><table class="table">
  185. <colgroup><col></colgroup>
  186. <thead><tr><th>
  187. <p>
  188. Output
  189. </p>
  190. </th></tr></thead>
  191. <tbody><tr><td>
  192. <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>
  193. <span class="identifier">Running</span> <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span><span class="special">...</span>
  194. <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"example"</span>
  195. <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>
  196. <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>
  197. <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>
  198. <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>
  199. <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>
  200. <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>
  201. <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>
  202. <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>
  203. </pre>
  204. </td></tr></tbody>
  205. </table></div>
  206. <div class="note"><table border="0" summary="Note">
  207. <tr>
  208. <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
  209. <th align="left">Note</th>
  210. </tr>
  211. <tr><td align="left" valign="top"><p>
  212. An <code class="computeroutput"><span class="identifier">assert</span><span class="special">(...)</span></code>
  213. might call <code class="computeroutput"><span class="identifier">abort</span><span class="special">()</span></code>:
  214. 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.
  215. </p></td></tr>
  216. </table></div>
  217. <h5>
  218. <a name="boost_test.testing_tools.exception_correctness.h2"></a>
  219. <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
  220. references</a>
  221. </h5>
  222. <div class="variablelist">
  223. <p class="title"><b>Publications</b></p>
  224. <dl class="variablelist">
  225. <dt><span class="term"><a href="https://isocpp.org/wiki/faq/exceptions" target="_top">Exceptions and
  226. Error Handling</a></span></dt>
  227. <dd><p>
  228. Standard C++ Foundation
  229. </p></dd>
  230. </dl>
  231. </div>
  232. </div>
  233. <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
  234. <td align="left"></td>
  235. <td align="right"><div class="copyright-footer">Copyright &#169; 2001-2019 Boost.Test
  236. contributors<p>
  237. Distributed under the Boost Software License, Version 1.0. (See accompanying
  238. 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>)
  239. </p>
  240. </div></td>
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