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tests_dependencies.html

tests_dependencies.html 23 KB
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    24. 

  24. </div>
    25. 

  25. <div class="section">
    26. 

  26. <div class="titlepage"><div><div><h3 class="title">
    27. 

  27. <a name="boost_test.tests_organization.tests_dependencies"></a><a class="link" href="tests_dependencies.html" title="Managing test dependencies">Managing
    28. 

  28.       test dependencies</a>
    29. 

  29. </h3></div></div></div>
    30. 

  30. <p>
    31. 

  31.         In general, it is a good practice to write any test as independent as possible
    32. 

  32.         from any other, there are however cases where a dependency cannot be avoided
    33. 

  33.         and an order for executing the tests is needed.
    34. 

  34.       </p>
    35. 

  35. <p>
    36. 

  36.         In the general setup and for any two test cases <code class="computeroutput"><span class="identifier">TA</span></code>
    37. 

  37.         and <code class="computeroutput"><span class="identifier">TB</span></code>, <code class="computeroutput"><span class="identifier">TB</span></code>
    38. 

  38.         should not take for granted that <code class="computeroutput"><span class="identifier">TA</span></code>
    39. 

  39.         has already executed, even if <code class="computeroutput"><span class="identifier">TA</span></code>
    40. 

  40.         is declared before <code class="computeroutput"><span class="identifier">TB</span></code> in
    41. 

  41.         the same translation unit. The only ordering-related guarantee that <span class="emphasis"><em>Unit
    42. 

  42.         Test Framework</em></span> makes by default is that if test cases <code class="computeroutput"><span class="identifier">TA</span></code> and <code class="computeroutput"><span class="identifier">TB</span></code>
    43. 

  43.         are declared in the same test suite, no test case (call it <code class="computeroutput"><span class="identifier">TX</span></code>) from any other test suite is executed
    44. 

  44.         between <code class="computeroutput"><span class="identifier">TA</span></code> and <code class="computeroutput"><span class="identifier">TB</span></code>, even if the declaration of <code class="computeroutput"><span class="identifier">TX</span></code> appears between the declarations of
    45. 

  45.         <code class="computeroutput"><span class="identifier">TA</span></code> and <code class="computeroutput"><span class="identifier">TB</span></code>.
    46. 

  46.         In other words, all tests from a suite are executed in one go, even if the
    47. 

  47.         test suite namespace is opened multiple times.
    48. 

  48.       </p>
    49. 

  49. <p>
    50. 

  50.         Even though the order is not guaranteed, it may accidentally be preserved
    51. 

  51.         across the different runs. In order to make sure the test cases do not depend
    52. 

  52.         on one another, the test module may be called with an additional command-line
    53. 

  53.         argument, <a class="link" href="../utf_reference/rt_param_reference/random.html" title="random"><code class="computeroutput"><span class="identifier">random</span></code></a>, to shuffle the tests unit
    54. 

  54.         ordering and to be more robust against an erroneous implicit ordering.
    55. 

  55.       </p>
    56. 

  56. <h4>
    57. 

  57. <a name="boost_test.tests_organization.tests_dependencies.h0"></a>
    58. 

  58.         <span class="phrase"><a name="boost_test.tests_organization.tests_dependencies.declaring_a_test_case_dependency"></a></span><a class="link" href="tests_dependencies.html#boost_test.tests_organization.tests_dependencies.declaring_a_test_case_dependency">Declaring
    59. 

  59.         a test case dependency</a>
    60. 

  60.       </h4>
    61. 

  61. <p>
    62. 

  62.         If there exist a dependency between test units, and an ordering is required
    63. 

  63.         between the execution of those tests, it has to be declared explicitly. Dependencies
    64. 

  64.         in the <span class="emphasis"><em>Unit Test Framework</em></span> affect two dimensions of
    65. 

  65.         test units, which are:
    66. 

  66.       </p>
    67. 

  67. <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
    68. 

  68. <li class="listitem">
    69. 

  69.             the order of execution of these units
    70. 

  70.           </li>
    71. 

  71. <li class="listitem">
    72. 

  72.             the execution of a test unit, which is conditioned by the state of its
    73. 

  73.             parents
    74. 

  74.           </li>
    75. 

  75. </ul></div>
    76. 

  76. <p>
    77. 

  77.         <a class="link" href="decorators.html" title="Decorators">Decorator</a>
    78. 

  78.         <a class="link" href="../utf_reference/test_org_reference/decorator_depends_on.html" title="depends_on (decorator)"><code class="computeroutput"><span class="identifier">depends_on</span></code></a> associates the decorated
    79. 

  79.         test case (call it <code class="computeroutput"><span class="identifier">TB</span></code>) with
    80. 

  80.         another test case (call it <code class="computeroutput"><span class="identifier">TA</span></code>)
    81. 

  81.         specified by name. This affects the processing the test tree in two ways:
    82. 

  82.       </p>
    83. 

  83. <div class="orderedlist"><ol class="orderedlist" type="1">
    84. 

  84. <li class="listitem">
    85. 

  85.             first, test case <code class="computeroutput"><span class="identifier">TA</span></code> is
    86. 

  86.             ordered to be run before <code class="computeroutput"><span class="identifier">TB</span></code>,
    87. 

  87.             irrespective of the order in which they were declared or added to the
    88. 

  88.             test tree,
    89. 

  89.           </li>
    90. 

  90. <li class="listitem">
    91. 

  91.             second, the execution of <code class="computeroutput"><span class="identifier">TB</span></code>
    92. 

  92.             is skipped if <code class="computeroutput"><span class="identifier">TA</span></code> is either
    93. 

  93.             disabled or skipped or is executed and marked as failed.
    94. 

  94.           </li>
    95. 

  95. </ol></div>
    96. 

  96. <h6>
    97. 

  97. <a name="boost_test.tests_organization.tests_dependencies.h1"></a>
    98. 

  98.         <span class="phrase"><a name="boost_test.tests_organization.tests_dependencies.example_descr"></a></span><a class="link" href="tests_dependencies.html#boost_test.tests_organization.tests_dependencies.example_descr">Example:
    99. 

  99.         decorator depends_on</a>
    100. 

  100.       </h6>
    101. 

  101. <div class="informaltable"><table class="table">
    102. 

  102. <colgroup><col></colgroup>
    103. 

  103. <thead><tr><th>
    104. 

  104.                 <p>
    105. 

  105.                   Code
    106. 

  106.                 </p>
    107. 

  107.               </th></tr></thead>
    108. 

  108. <tbody><tr><td>
    109. 

  109. <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">decorator_07</span>
    110. 

  110. <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>
    111. 

  111. 

  112. <span class="keyword">namespace</span> <span class="identifier">utf</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">;</span>
    113. 

  113. 

  114. <span class="comment">// test1 and test2 defined at the bottom</span>
    115. 

  115. 

  116. <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test3</span><span class="special">,</span> <span class="special">*</span> <span class="identifier">utf</span><span class="special">::</span><span class="identifier">depends_on</span><span class="special">(</span><span class="string">"s1/test1"</span><span class="special">))</span>
    117. 

  117. <span class="special">{</span>
    118. 

  118.   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span>
    119. 

  119. <span class="special">}</span>
    120. 

  120. 

  121. <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test4</span><span class="special">,</span> <span class="special">*</span> <span class="identifier">utf</span><span class="special">::</span><span class="identifier">depends_on</span><span class="special">(</span><span class="string">"test3"</span><span class="special">))</span>
    122. 

  122. <span class="special">{</span>
    123. 

  123.   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span>
    124. 

  124. <span class="special">}</span>
    125. 

  125. 

  126. <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test5</span><span class="special">,</span> <span class="special">*</span> <span class="identifier">utf</span><span class="special">::</span><span class="identifier">depends_on</span><span class="special">(</span><span class="string">"s1/test2"</span><span class="special">))</span>
    127. 

  127. <span class="special">{</span>
    128. 

  128.   <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span>
    129. 

  129. <span class="special">}</span>
    130. 

  130. 

  131. <span class="identifier">BOOST_AUTO_TEST_SUITE</span><span class="special">(</span><span class="identifier">s1</span><span class="special">)</span>
    132. 

  132. 

  133.   <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test1</span><span class="special">)</span>
    134. 

  134.   <span class="special">{</span>
    135. 

  135.     <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="keyword">true</span><span class="special">);</span>
    136. 

  136.   <span class="special">}</span>
    137. 

  137. 

  138.   <span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test2</span><span class="special">,</span> <span class="special">*</span> <span class="identifier">utf</span><span class="special">::</span><span class="identifier">disabled</span><span class="special">())</span>
    139. 

  139.   <span class="special">{</span>
    140. 

  140.     <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span>
    141. 

  141.   <span class="special">}</span>
    142. 

  142. 

  143. <span class="identifier">BOOST_AUTO_TEST_SUITE_END</span><span class="special">()</span>
    144. 

  144. </pre>
    145. 

  145.               </td></tr></tbody>
    146. 

  146. </table></div>
    147. 

  147. <div class="informaltable"><table class="table">
    148. 

  148. <colgroup><col></colgroup>
    149. 

  149. <thead><tr><th>
    150. 

  150.                 <p>
    151. 

  151.                   Output
    152. 

  152.                 </p>
    153. 

  153.               </th></tr></thead>
    154. 

  154. <tbody><tr><td>
    155. 

  155. <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="identifier">decorator_07</span> <span class="special">--</span><span class="identifier">report_level</span><span class="special">=</span><span class="identifier">detailed</span> <span class="special">--</span><span class="identifier">log_level</span><span class="special">=</span><span class="identifier">all</span>
    156. 

  156. <span class="identifier">Running</span> <span class="number">4</span> <span class="identifier">test</span> <span class="identifier">cases</span><span class="special">...</span>
    157. 

  157. <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"decorator_07"</span>
    158. 

  158. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">31</span><span class="special">:</span> <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="identifier">suite</span> <span class="string">"s1"</span>
    159. 

  159. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">33</span><span class="special">:</span> <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test1"</span>
    160. 

  160. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">35</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>
    161. 

  161. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">33</span><span class="special">:</span> <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test1"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">100u</span><span class="identifier">s</span>
    162. 

  162. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">31</span><span class="special">:</span> <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="identifier">suite</span> <span class="string">"s1"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">129u</span><span class="identifier">s</span>
    163. 

  163. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">16</span><span class="special">:</span> <span class="identifier">Entering</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test3"</span>
    164. 

  164. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">18</span><span class="special">:</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test3"</span><span class="special">:</span> <span class="identifier">check</span> <span class="keyword">false</span> <span class="identifier">has</span> <span class="identifier">failed</span>
    165. 

  165. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">16</span><span class="special">:</span> <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test3"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">48u</span><span class="identifier">s</span>
    166. 

  166. <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">Test</span> <span class="keyword">case</span> <span class="string">"test5"</span> <span class="identifier">is</span> <span class="identifier">skipped</span> <span class="identifier">because</span> <span class="identifier">dependency</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"s1/test2"</span> <span class="identifier">is</span> <span class="identifier">disabled</span>
    167. 

  167. <span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">:</span><span class="number">21</span><span class="special">:</span> <span class="identifier">Test</span> <span class="keyword">case</span> <span class="string">"test4"</span> <span class="identifier">is</span> <span class="identifier">skipped</span> <span class="identifier">because</span> <span class="identifier">dependency</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="string">"test3"</span> <span class="identifier">has</span> <span class="identifier">failed</span>
    168. 

  168. <span class="identifier">Leaving</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"decorator_07"</span><span class="special">;</span> <span class="identifier">testing</span> <span class="identifier">time</span><span class="special">:</span> <span class="number">263u</span><span class="identifier">s</span>
    169. 

  169. 

  170. <span class="identifier">Test</span> <span class="identifier">module</span> <span class="string">"decorator_07"</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="identifier">with</span><span class="special">:</span>
    171. 

  171.   <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="identifier">out</span> <span class="identifier">of</span> <span class="number">4</span> <span class="identifier">passed</span>
    172. 

  172.   <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="identifier">out</span> <span class="identifier">of</span> <span class="number">4</span> <span class="identifier">failed</span>
    173. 

  173.   <span class="number">2</span> <span class="identifier">test</span> <span class="identifier">cases</span> <span class="identifier">out</span> <span class="identifier">of</span> <span class="number">4</span> <span class="identifier">skipped</span>
    174. 

  174.   <span class="number">1</span> <span class="identifier">assertion</span> <span class="identifier">out</span> <span class="identifier">of</span> <span class="number">2</span> <span class="identifier">passed</span>
    175. 

  175.   <span class="number">1</span> <span class="identifier">assertion</span> <span class="identifier">out</span> <span class="identifier">of</span> <span class="number">2</span> <span class="identifier">failed</span>
    176. 

  176. 

  177.   <span class="identifier">Test</span> <span class="keyword">case</span> <span class="string">"test3"</span> <span class="identifier">has</span> <span class="identifier">failed</span> <span class="identifier">with</span><span class="special">:</span>
    178. 

  178.     <span class="number">1</span> <span class="identifier">assertion</span> <span class="identifier">out</span> <span class="identifier">of</span> <span class="number">1</span> <span class="identifier">failed</span>
    179. 

  179. 

  180.   <span class="identifier">Test</span> <span class="keyword">case</span> <span class="string">"test4"</span> <span class="identifier">was</span> <span class="identifier">skipped</span>
    181. 

  181.   <span class="identifier">Test</span> <span class="keyword">case</span> <span class="string">"test5"</span> <span class="identifier">was</span> <span class="identifier">skipped</span>
    182. 

  182.   <span class="identifier">Test</span> <span class="identifier">suite</span> <span class="string">"s1"</span> <span class="identifier">has</span> <span class="identifier">passed</span> <span class="identifier">with</span><span class="special">:</span>
    183. 

  183.     <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span> <span class="identifier">out</span> <span class="identifier">of</span> <span class="number">1</span> <span class="identifier">passed</span>
    184. 

  184.     <span class="number">1</span> <span class="identifier">assertion</span> <span class="identifier">out</span> <span class="identifier">of</span> <span class="number">1</span> <span class="identifier">passed</span>
    185. 

  185. 

  186.     <span class="identifier">Test</span> <span class="keyword">case</span> <span class="string">"s1/test1"</span> <span class="identifier">has</span> <span class="identifier">passed</span> <span class="identifier">with</span><span class="special">:</span>
    187. 

  187.       <span class="number">1</span> <span class="identifier">assertion</span> <span class="identifier">out</span> <span class="identifier">of</span> <span class="number">1</span> <span class="identifier">passed</span>
    188. 

  188. </pre>
    189. 

  189.               </td></tr></tbody>
    190. 

  190. </table></div>
    191. 

  191. <p>
    192. 

  192.         In the above scenario:
    193. 

  193.       </p>
    194. 

  194. <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
    195. 

  195. <li class="listitem">
    196. 

  196.             test case <code class="computeroutput"><span class="identifier">test3</span></code> is run
    197. 

  197.             (and fails) because <code class="computeroutput"><span class="identifier">s1</span><span class="special">/</span><span class="identifier">test1</span></code>
    198. 

  198.             has been run and succeeded,
    199. 

  199.           </li>
    200. 

  200. <li class="listitem">
    201. 

  201.             <code class="computeroutput"><span class="identifier">test4</span></code> is skipped because
    202. 

  202.             <code class="computeroutput"><span class="identifier">test3</span></code> has failed,
    203. 

  203.           </li>
    204. 

  204. <li class="listitem">
    205. 

  205.             <code class="computeroutput"><span class="identifier">test5</span></code> is skipped because
    206. 

  206.             <code class="computeroutput"><span class="identifier">s1</span><span class="special">/</span><span class="identifier">test2</span></code> is disabled.
    207. 

  207.           </li>
    208. 

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    209. 

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  215.         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>)
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