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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>
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329<td align="right"><div class="copyright-footer">Copyright © 2001-2020 Boost.Test contributors<p>
330        Distributed under the Boost Software License, Version 1.0. (See accompanying
331        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>)
332      </p>
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