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  25 <div class="section">
  26 <div class="titlepage"><div><div><h4 class="title">
  27 <a name="boost_test.tests_organization.fixtures.case"></a><a class="link" href="case.html" title="Test case fixture">Test case
  28         fixture</a>
  29 </h4></div></div></div>
  30 <p>
  31           A <span class="emphasis"><em>test case fixture</em></span> is a fixture consumed by a test
  32           case: the fixture <code class="computeroutput"><span class="identifier">setup</span></code>
  33           is called before the test case executes, and the fixture <code class="computeroutput"><span class="identifier">teardown</span></code> is called after the test case
  34           finished its execution, independently from its execution state.
  35         </p>
  36 <p>
  37           The <span class="emphasis"><em>Unit Test Framework</em></span> provides several ways of defining
  38           fixtures for test-cases, each of which having their properties:
  39         </p>
  40 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  41 <li class="listitem">
  42               the declaration of a fixture for a single test case, letting the test
  43               case access the members of the fixture,
  44             </li>
  45 <li class="listitem">
  46               the declaration of one or more fixture(s) for a single test case, without
  47               accessing the members and with a flexible interface,
  48             </li>
  49 <li class="listitem">
  50               the declaration of a fixture for a group of test-cases defined by a
  51               subtree, with access to the members of the fixture.
  52             </li>
  53 </ul></div>
  54 <h4>
  55 <a name="boost_test.tests_organization.fixtures.case.h0"></a>
  56           <span class="phrase"><a name="boost_test.tests_organization.fixtures.case.single_test_case_fixture"></a></span><a class="link" href="case.html#boost_test.tests_organization.fixtures.case.single_test_case_fixture">Single
  57           test case fixture</a>
  58         </h4>
  59 <p>
  60           The following two methods are available for declaring a fixture attached
  61           to one particular test case:
  62         </p>
  63 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
  64 <li class="listitem">
  65               the use of the macro <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_test_case_fixture.html" title="BOOST_FIXTURE_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_CASE</span></code></a> in
  66               place of <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_auto_test_case.html" title="BOOST_AUTO_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_AUTO_TEST_CASE</span></code></a>, which
  67               let access to the members of the fixture
  68             </li>
  69 <li class="listitem">
  70               the use of the decorator <a class="link" href="../../utf_reference/test_org_reference/decorator_fixture.html" title="fixture (decorator)"><code class="computeroutput"><span class="identifier">fixture</span></code></a>, which does not let
  71               access to the members but enables the definition of several fixtures
  72               for one test case.
  73             </li>
  74 </ul></div>
  75 <a name="test_case_fixture_macro"></a><h5>
  76 <a name="boost_test.tests_organization.fixtures.case.h1"></a>
  77           <span class="phrase"><a name="boost_test.tests_organization.fixtures.case.fixture_with_boost_fixture_test_"></a></span><a class="link" href="case.html#boost_test.tests_organization.fixtures.case.fixture_with_boost_fixture_test_">Fixture
  78           with <code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_CASE</span></code></a>
  79         </h5>
  80 <p>
  81           <code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_CASE</span></code>
  82           serves as a test case declaration with a fixture, and is meant be used
  83           in place of the test case declaration with <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_auto_test_case.html" title="BOOST_AUTO_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_AUTO_TEST_CASE</span></code></a>:
  84         </p>
  85 <pre class="programlisting"><span class="identifier">BOOST_FIXTURE_TEST_CASE</span><span class="special">(</span><span class="identifier">test_case_name</span><span class="special">,</span> <span class="identifier">fixture_name</span><span class="special">);</span>
  86 </pre>
  87 <p>
  88           The only difference from the macro <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_auto_test_case.html" title="BOOST_AUTO_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_AUTO_TEST_CASE</span></code></a> is the presence
  89           of an extra argument <code class="computeroutput"><span class="identifier">fixture_name</span></code>.
  90           The public and protected members of the fixture are directly accessible
  91           from the test case body. Only one fixture can be attached to a test-case
  92           <a href="#ftn.boost_test.tests_organization.fixtures.case.f0" class="footnote" name="boost_test.tests_organization.fixtures.case.f0"><sup class="footnote">[4]</sup></a>.
  93         </p>
  94 <div class="note"><table border="0" summary="Note">
  95 <tr>
  96 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td>
  97 <th align="left">Note</th>
  98 </tr>
  99 <tr><td align="left" valign="top"><p>
 100             You can't access private members of fixture, but then why would you make
 101             anything private?
 102           </p></td></tr>
 103 </table></div>
 104 <h6>
 105 <a name="boost_test.tests_organization.fixtures.case.h2"></a>
 106           <span class="phrase"><a name="boost_test.tests_organization.fixtures.case.example_descr"></a></span><a class="link" href="case.html#boost_test.tests_organization.fixtures.case.example_descr">Example:
 107           Per test case fixture</a>
 108         </h6>
 109 <div class="informaltable"><table class="table">
 110 <colgroup><col></colgroup>
 111 <thead><tr><th>
 112                   <p>
 113                     Code
 114                   </p>
 115                 </th></tr></thead>
 116 <tbody><tr><td>
 117 <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>
 118 <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>
 119
 120 <span class="keyword">struct</span> <span class="identifier">F</span> <span class="special">{</span>
 121   <span class="identifier">F</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">i</span><span class="special">(</span> <span class="number">0</span> <span class="special">)</span> <span class="special">{</span> <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span> <span class="string">"setup fixture"</span> <span class="special">);</span> <span class="special">}</span>
 122   <span class="special">~</span><span class="identifier">F</span><span class="special">()</span>         <span class="special">{</span> <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span> <span class="string">"teardown fixture"</span> <span class="special">);</span> <span class="special">}</span>
 123
 124   <span class="keyword">int</span> <span class="identifier">i</span><span class="special">;</span>
 125 <span class="special">};</span>
 126
 127 <span class="identifier">BOOST_FIXTURE_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_case1</span><span class="special">,</span> <span class="identifier">F</span> <span class="special">)</span>
 128 <span class="special">{</span>
 129   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="identifier">i</span> <span class="special">==</span> <span class="number">1</span> <span class="special">);</span>
 130   <span class="special">++</span><span class="identifier">i</span><span class="special">;</span>
 131 <span class="special">}</span>
 132
 133 <span class="identifier">BOOST_FIXTURE_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_case2</span><span class="special">,</span> <span class="identifier">F</span> <span class="special">)</span>
 134 <span class="special">{</span>
 135   <span class="identifier">BOOST_CHECK_EQUAL</span><span class="special">(</span> <span class="identifier">i</span><span class="special">,</span> <span class="number">1</span> <span class="special">);</span>
 136 <span class="special">}</span>
 137
 138 <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span> <span class="identifier">test_case3</span> <span class="special">)</span>
 139 <span class="special">{</span>
 140   <span class="identifier">BOOST_TEST</span><span class="special">(</span> <span class="keyword">true</span> <span class="special">);</span>
 141 <span class="special">}</span>
 142 </pre>
 143                 </td></tr></tbody>
 144 </table></div>
 145 <div class="informaltable"><table class="table">
 146 <colgroup><col></colgroup>
 147 <thead><tr><th>
 148                   <p>
 149                     Output
 150                   </p>
 151                 </th></tr></thead>
 152 <tbody><tr><td>
 153 <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">message</span>
 154 <span class="identifier">Running</span> <span class="number">3</span> <span class="identifier">test</span> <span class="identifier">cases</span><span class="special">...</span>
 155 <span class="identifier">setup</span> <span class="identifier">fixture</span>
 156 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">13</span><span class="special">):</span> <span class="identifier">error</span> <span class="identifier">in</span> <span class="string">"test_case1"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">i</span> <span class="special">==</span> <span class="number">1</span> <span class="identifier">has</span> <span class="identifier">failed</span>
 157 <span class="identifier">teardown</span> <span class="identifier">fixture</span>
 158 <span class="identifier">setup</span> <span class="identifier">fixture</span>
 159 <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">19</span><span class="special">):</span> <span class="identifier">error</span> <span class="identifier">in</span> <span class="string">"test_case2"</span><span class="special">:</span> <span class="identifier">check</span> <span class="identifier">i</span> <span class="special">==</span> <span class="number">1</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="special">[</span><span class="number">0</span> <span class="special">!=</span> <span class="number">1</span><span class="special">]</span>
 160 <span class="identifier">teardown</span> <span class="identifier">fixture</span>
 161
 162 <span class="special">***</span> <span class="number">2</span> <span class="identifier">failures</span> <span class="identifier">are</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>
 163 </pre>
 164                 </td></tr></tbody>
 165 </table></div>
 166 <p>
 167           In this example only <code class="computeroutput"><span class="identifier">test_case1</span></code>
 168           and <code class="computeroutput"><span class="identifier">test_case2</span></code> have fixture
 169           <code class="computeroutput"><span class="identifier">F</span></code> assigned. You still need
 170           to refer to the fixture name in every test case. <a class="link" href="case.html#test_case_fixture_subtree">This</a>
 171           section explains how a same fixture can be declared for a subtree under
 172           a test suite.
 173         </p>
 174 <a name="test_case_fixture_decorator"></a><h5>
 175 <a name="boost_test.tests_organization.fixtures.case.h3"></a>
 176           <span class="phrase"><a name="boost_test.tests_organization.fixtures.case.fixture_with_fixture_decorator"></a></span><a class="link" href="case.html#boost_test.tests_organization.fixtures.case.fixture_with_fixture_decorator">Fixture
 177           with <code class="computeroutput"><span class="identifier">fixture</span></code> decorator</a>
 178         </h5>
 179 <p>
 180           By using the decorator <a class="link" href="../../utf_reference/test_org_reference/decorator_fixture.html" title="fixture (decorator)"><code class="computeroutput"><span class="identifier">fixture</span></code></a>, it is possible to:
 181         </p>
 182 <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
 183 <li class="listitem">
 184               attach several fixtures to a unique test case
 185             </li>
 186 <li class="listitem">
 187               use a flexible fixture interface (see <a class="link" href="models.html" title="Fixture models">here</a>)
 188             </li>
 189 </ul></div>
 190 <div class="note"><table border="0" summary="Note">
 191 <tr>
 192 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td>
 193 <th align="left">Note</th>
 194 </tr>
 195 <tr><td align="left" valign="top"><p>
 196             Using the decorator approach, it is not possible to access the members
 197             of the fixture (in case the fixture is implemented as a class)
 198           </p></td></tr>
 199 </table></div>
 200 <a name="test_case_fixture_subtree"></a><h4>
 201 <a name="boost_test.tests_organization.fixtures.case.h4"></a>
 202           <span class="phrase"><a name="boost_test.tests_organization.fixtures.case.fixture_for_a_complete_subtree"></a></span><a class="link" href="case.html#boost_test.tests_organization.fixtures.case.fixture_for_a_complete_subtree">Fixture
 203           for a complete subtree</a>
 204         </h4>
 205 <p>
 206           If all test cases in a test sub tree require the same fixture (you can
 207           group test cases in a test suite based on a fixture required) you can make
 208           another step toward an automation of a test fixture assignment. To assign
 209           the same shared fixture for all test cases in a test suite, use the macro
 210           <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_test_suite_fixture.html" title="BOOST_FIXTURE_TEST_SUITE"><code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_SUITE</span></code></a> in place
 211           of the macro <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_auto_test_suite.html" title="BOOST_AUTO_TEST_SUITE"><code class="computeroutput"><span class="identifier">BOOST_AUTO_TEST_SUITE</span></code></a> for automated
 212           test suite creation and registration.
 213         </p>
 214 <pre class="programlisting"><span class="identifier">BOOST_FIXTURE_TEST_SUITE</span><span class="special">(</span><span class="identifier">suite_name</span><span class="special">,</span> <span class="identifier">fixture_name</span><span class="special">);</span>
 215 </pre>
 216 <p>
 217           Once again the only difference from the macro <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_auto_test_suite.html" title="BOOST_AUTO_TEST_SUITE"><code class="computeroutput"><span class="identifier">BOOST_AUTO_TEST_SUITE</span></code></a> usage is
 218           the presence of an extra argument - the fixture name. And now, you not
 219           only have direct access to the public and protected members of the fixture,
 220           but also do not need to refer to the fixture name in test case definition.
 221           All test cases assigned the same fixture automatically.
 222         </p>
 223 <div class="tip"><table border="0" summary="Tip">
 224 <tr>
 225 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../../../../../doc/src/images/tip.png"></td>
 226 <th align="left">Tip</th>
 227 </tr>
 228 <tr><td align="left" valign="top"><p>
 229             If necessary you can reset the fixture for a particular test case using
 230             the macro <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_test_case_fixture.html" title="BOOST_FIXTURE_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_CASE</span></code></a>. Similarly
 231             you can reset the fixture for a particular sub test suite using <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_test_suite_fixture.html" title="BOOST_FIXTURE_TEST_SUITE"><code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_SUITE</span></code></a>.
 232           </p></td></tr>
 233 </table></div>
 234 <div class="note"><table border="0" summary="Note">
 235 <tr>
 236 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td>
 237 <th align="left">Note</th>
 238 </tr>
 239 <tr><td align="left" valign="top"><p>
 240             The fixture assignment is <span class="emphasis"><em>deep</em></span>. In other words unless
 241             reset by another <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_test_suite_fixture.html" title="BOOST_FIXTURE_TEST_SUITE"><code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_SUITE</span></code></a> or
 242             <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_test_case_fixture.html" title="BOOST_FIXTURE_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_CASE</span></code></a> definition
 243             the same fixture is assigned to all test cases of a test suite, including
 244             ones that belong to the sub test suites.
 245           </p></td></tr>
 246 </table></div>
 247 <h6>
 248 <a name="boost_test.tests_organization.fixtures.case.h5"></a>
 249           <span class="phrase"><a name="boost_test.tests_organization.fixtures.case.example_descr0"></a></span><a class="link" href="case.html#boost_test.tests_organization.fixtures.case.example_descr0">Example:
 250           Test suite level fixture</a>
 251         </h6>
 252 <div class="informaltable"><table class="table">
 253 <colgroup><col></colgroup>
 254 <thead><tr><th>
 255                   <p>
 256                     Code
 257                   </p>
 258                 </th></tr></thead>
 259 <tbody><tr><td>
 260 <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">fixture_02</span>
 261 <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>
 262
 263 <span class="keyword">struct</span> <span class="identifier">F</span> <span class="special">{</span>
 264   <span class="identifier">F</span><span class="special">()</span> <span class="special">:</span> <span class="identifier">i</span><span class="special">(</span> <span class="number">0</span> <span class="special">)</span> <span class="special">{</span> <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span> <span class="string">"setup fixture"</span> <span class="special">);</span> <span class="special">}</span>
 265   <span class="special">~</span><span class="identifier">F</span><span class="special">()</span>         <span class="special">{</span> <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span> <span class="string">"teardown fixture"</span> <span class="special">);</span> <span class="special">}</span>
 266
 267   <span class="keyword">int</span> <span class="identifier">i</span><span class="special">;</span>
 268 <span class="special">};</span>
 269
 270 <span class="identifier">BOOST_FIXTURE_TEST_SUITE</span><span class="special">(</span><span class="identifier">s</span><span class="special">,</span> <span class="identifier">F</span><span class="special">)</span>
 271
 272   <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test_case1</span><span class="special">)</span>
 273   <span class="special">{</span>
 274     <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span><span class="string">"running test_case1"</span><span class="special">);</span>
 275     <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">i</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span>
 276   <span class="special">}</span>
 277
 278   <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test_case2</span><span class="special">)</span>
 279   <span class="special">{</span>
 280     <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span><span class="string">"running test_case2"</span><span class="special">);</span>
 281     <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="identifier">i</span> <span class="special">==</span> <span class="number">0</span><span class="special">);</span>
 282   <span class="special">}</span>
 283
 284 <span class="identifier">BOOST_AUTO_TEST_SUITE_END</span><span class="special">()</span>
 285 </pre>
 286                 </td></tr></tbody>
 287 </table></div>
 288 <div class="informaltable"><table class="table">
 289 <colgroup><col></colgroup>
 290 <thead><tr><th>
 291                   <p>
 292                     Output
 293                   </p>
 294                 </th></tr></thead>
 295 <tbody><tr><td>
 296 <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="identifier">fixture_02</span> <span class="special">--</span><span class="identifier">log_level</span><span class="special">=</span><span class="identifier">message</span>
 297 <span class="identifier">Running</span> <span class="number">2</span> <span class="identifier">test</span> <span class="identifier">cases</span><span class="special">...</span>
 298 <span class="identifier">setup</span> <span class="identifier">fixture</span>
 299 <span class="identifier">running</span> <span class="identifier">test_case1</span>
 300 <span class="identifier">teardown</span> <span class="identifier">fixture</span>
 301 <span class="identifier">setup</span> <span class="identifier">fixture</span>
 302 <span class="identifier">running</span> <span class="identifier">test_case2</span>
 303 <span class="identifier">teardown</span> <span class="identifier">fixture</span>
 304
 305 <span class="special">***</span> <span class="identifier">No</span> <span class="identifier">errors</span> <span class="identifier">detected</span>
 306 </pre>
 307                 </td></tr></tbody>
 308 </table></div>
 309 <div class="caution"><table border="0" summary="Caution">
 310 <tr>
 311 <td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../../../../../../../doc/src/images/caution.png"></td>
 312 <th align="left">Caution</th>
 313 </tr>
 314 <tr><td align="left" valign="top"><p>
 315             The fixture constructor/setup and teardown/destructor is called for each
 316             test cases (the state of the fixture is not shared among the test cases).
 317           </p></td></tr>
 318 </table></div>
 319 <div class="footnotes">
 320 <br><hr style="width:100; text-align:left;margin-left: 0">
 321 <div id="ftn.boost_test.tests_organization.fixtures.case.f0" class="footnote"><p><a href="#boost_test.tests_organization.fixtures.case.f0" class="para"><sup class="para">[4] </sup></a>
 322             it is still possible to define a class inheriting from several fixtures,
 323             that will act as a proxy fixture.
 324           </p></div>
 325 </div>
 326 </div>
 327 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 328 <td align="left"></td>
 329 <td align="right"><div class="copyright-footer">Copyright &#169; 2001-2019 Boost.Test
 330       contributors<p>
 331         Distributed under the Boost Software License, Version 1.0. (See accompanying
 332         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>)
 333       </p>
 334 </div></td>
 335 </tr></table>
 336 <hr>
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