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- <a name="boost_test.adv_scenarios.entry_point_overview"></a><a class="link" href="entry_point_overview.html" title="Test module's entry point">Test module's
- entry point</a>
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- <p>
- Typically, every C++ program contains exactly one definition of function
- <code class="computeroutput"><span class="identifier">main</span></code>: the program's <span class="emphasis"><em>entry
- point</em></span>. When using the <span class="emphasis"><em>Unit Test Framework</em></span>
- you do not have to define one. Function <code class="computeroutput"><span class="identifier">main</span></code>
- will be generated for you by the framework. The only thing you are required
- to do in case your program consists of more than one translation unit (<code class="computeroutput"><span class="identifier">cpp</span></code> file) is to indicate to the framework
- in which of the files it is supposed to generate function <code class="computeroutput"><span class="identifier">main</span></code>.
- You do it by defining macro <a class="link" href="../utf_reference/link_references/link_boost_test_module_macro.html" title="BOOST_TEST_MODULE"><code class="computeroutput"><span class="identifier">BOOST_TEST_MODULE</span></code></a> before the inclusion
- of any of the framework files. The value of this macro is used as a name
- of the <a class="link" href="../section_glossary.html#ref_test_module">test module</a> as well as the
- <a class="link" href="../tests_organization/test_tree/master_test_suite.html" title="Master test suite">master
- test suite</a>.
- </p>
- <p>
- The reason for defining function <code class="computeroutput"><span class="identifier">main</span></code>
- for you is twofold:
- </p>
- <div class="orderedlist"><ol class="orderedlist" type="1">
- <li class="listitem">
- This allows the <span class="emphasis"><em>Unit Test Framework</em></span> to perform some
- custom <a class="link" href="test_module_init_overview.html" title="Test module's initialization"><span class="emphasis"><em>test
- module initialization</em></span></a>.
- </li>
- <li class="listitem">
- This prevents you defining <code class="computeroutput"><span class="identifier">main</span></code>,
- and accidentally forgetting to run all the test (in which case running
- the program would incorrectly indicate a clean run).
- </li>
- </ol></div>
- <p>
- By default, the test module's entry point is defined with signature:
- </p>
- <pre class="programlisting"><span class="keyword">int</span> <span class="identifier">main</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">argc</span><span class="special">,</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">argv</span><span class="special">[]);</span>
- </pre>
- <p>
- It calls <a class="link" href="test_module_init_overview.html" title="Test module's initialization"><span class="emphasis"><em>test
- module initialization</em></span></a> function, then calls the <a class="link" href="test_module_runner_overview.html" title="Test module runner"><span class="emphasis"><em>test
- module runner</em></span></a> and forwards its return value to environment.
- </p>
- <p>
- The default entry point is sufficient in most of the cases. Occasionally,
- a need may arise to declare an entry point with a different name or signature.
- For overriding the definition of the default test module's entry point:
- </p>
- <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
- <li class="listitem">
- <a class="link" href="single_header_customizations/entry_point.html" title="Customizing the module's entry point">see
- here</a>, for header-only usage variant,
- </li>
- <li class="listitem">
- <a class="link" href="static_lib_customizations/entry_point.html" title="Customizing the module's entry point">see
- here</a>, for static library usage variant,
- </li>
- <li class="listitem">
- <a class="link" href="shared_lib_customizations/entry_point.html" title="Customizing the module's entry point">see
- here</a>, for shared library usage variant.
- </li>
- </ul></div>
- </div>
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