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<title>Assertion severity level</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_test.testing_tools.tools_assertion_severity_level"></a><a class="link" href="tools_assertion_severity_level.html" title="Assertion severity level">Assertion
      severity level</a>
</h3></div></div></div>
<p>
        There are three <span class="bold"><strong>levels</strong></span> of assertions and
        all the testing tools are supplied in these three flavours/levels. These
        levels have different meaning on the consistency of the test case:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            <code class="computeroutput"><span class="identifier">REQUIRE</span></code> which implements
            a <span class="bold"><strong>requirements</strong></span> : this is a strong condition
            for the operations following the assertion to be valid. This type of
            assertions should be used when a pre-condition for running the test is
            not met or when the test-case cannot continue. If such as assertion fails,
            the test case execution stops immediately, and the test-case is flagged
            as <span class="emphasis"><em>failed</em></span>.
          </li>
<li class="listitem">
            <code class="computeroutput"><span class="identifier">CHECK</span></code> for standard <span class="bold"><strong>checks</strong></span>: this is the most commonly used assertion
            level. If the statement evaluates to <code class="computeroutput"><span class="keyword">false</span></code>,
            the test case is flagged as failed but its execution continues.
          </li>
<li class="listitem">
            <code class="computeroutput"><span class="identifier">WARN</span></code> which stands for
            <span class="bold"><strong>warnings</strong></span>: this is an assertion providing
            information. The test case execution continues and a warning message
            is logged. The warning does not change the success status of a test case.
            This level of assertion can be used to validate aspects less important
            then correctness: performance, portability, usability, etc.
          </li>
</ul></div>
<p>
        For example:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            <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_REQUIRE_THROW</span></code></a>, <a class="link" href="../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST_REQUIRE</span></code></a>
          </li>
<li class="listitem">
            <code class="computeroutput"><span class="identifier">BOOST_CHECK_THROW</span></code>, <code class="computeroutput"><span class="identifier">BOOST_TEST</span></code> <a href="#ftn.boost_test.testing_tools.tools_assertion_severity_level.f0" class="footnote" name="boost_test.testing_tools.tools_assertion_severity_level.f0"><sup class="footnote">[6]</sup></a>
          </li>
<li class="listitem">
            <code class="computeroutput"><span class="identifier">BOOST_WARN_THROW</span></code>, <code class="computeroutput"><span class="identifier">BOOST_TEST_WARN</span></code>
          </li>
</ul></div>
<p>
        These three levels of assertions are filtered by the framework and reported
        into the test log and output:
      </p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
            If an assertion designated by the tool passes, confirmation message can
            be printed in log output <a href="#ftn.boost_test.testing_tools.tools_assertion_severity_level.f1" class="footnote" name="boost_test.testing_tools.tools_assertion_severity_level.f1"><sup class="footnote">[7]</sup></a>.
          </li>
<li class="listitem">
            If an assertion designated by the tool fails, the following will happen,
            depending on the assertion level <a href="#ftn.boost_test.testing_tools.tools_assertion_severity_level.f2" class="footnote" name="boost_test.testing_tools.tools_assertion_severity_level.f2"><sup class="footnote">[8]</sup></a>:
          </li>
</ol></div>
<div class="table">
<a name="boost_test.testing_tools.tools_assertion_severity_level.assertions_severity_levels"></a><p class="title"><b>Table&#160;3.&#160;Assertions severity levels</b></p>
<div class="table-contents"><table class="table" summary="Assertions severity levels">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Level
                </p>
              </th>
<th>
                <p>
                  Test log content
                </p>
              </th>
<th>
                <p>
                  Errors counter
                </p>
              </th>
<th>
                <p>
                  Test execution
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<td>
                <p>
                  WARN
                </p>
              </td>
<td>
                <p>
                  warning in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">test</span><span class="special">-</span><span class="keyword">case</span><span class="special">-</span><span class="identifier">name</span><span class="special">&gt;</span></code>: condition <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">assertion</span> <span class="identifier">description</span><span class="special">&gt;</span></code> is not satisfied
                </p>
              </td>
<td>
                <p>
                  not affected
                </p>
              </td>
<td>
                <p>
                  continues
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  CHECK
                </p>
              </td>
<td>
                <p>
                  error in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">test</span><span class="special">-</span><span class="keyword">case</span><span class="special">-</span><span class="identifier">name</span><span class="special">&gt;</span></code>: test <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">assertion</span> <span class="identifier">description</span><span class="special">&gt;</span></code> failed
                </p>
              </td>
<td>
                <p>
                  increased
                </p>
              </td>
<td>
                <p>
                  continues
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  REQUIRE
                </p>
              </td>
<td>
                <p>
                  fatal error in <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">test</span><span class="special">-</span><span class="keyword">case</span><span class="special">-</span><span class="identifier">name</span><span class="special">&gt;</span></code>:
                  critical test <code class="computeroutput"><span class="special">&lt;</span><span class="identifier">assertion</span> <span class="identifier">description</span><span class="special">&gt;</span></code> failed
                </p>
              </td>
<td>
                <p>
                  increased
                </p>
              </td>
<td>
                <p>
                  aborts
                </p>
              </td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><p>
        The granularity of the report depends on the current <a class="link" href="../utf_reference/rt_param_reference/log_level.html" title="log_level">log
        level</a> and <a class="link" href="../utf_reference/rt_param_reference/report_level.html" title="report_level">report
        level</a>.
      </p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
          in the above table, the <span class="emphasis"><em>test execution</em></span> is related
          to the current test case <span class="emphasis"><em>only</em></span>. Hence <span class="emphasis"><em>"aborts"</em></span>
          means that the current test case is aborted, but other test cases in the
          test tree are still executed.
        </p></td></tr>
</table></div>
<div class="footnotes">
<br><hr style="width:100; text-align:left;margin-left: 0">
<div id="ftn.boost_test.testing_tools.tools_assertion_severity_level.f0" class="footnote"><p><a href="#boost_test.testing_tools.tools_assertion_severity_level.f0" class="para"><sup class="para">[6] </sup></a>
              <a class="link" href="../utf_reference/testing_tool_ref/assertion_boost_test_universal_macro.html" title="BOOST_TEST"><code class="computeroutput"><span class="identifier">BOOST_TEST</span></code></a> is equivalent to
              <code class="computeroutput"><span class="identifier">BOOST_TEST_CHECK</span></code>
            </p></div>
<div id="ftn.boost_test.testing_tools.tools_assertion_severity_level.f1" class="footnote"><p><a href="#boost_test.testing_tools.tools_assertion_severity_level.f1" class="para"><sup class="para">[7] </sup></a>
              to manage what messages appear in the test log stream, set the proper
              <a class="link" href="../utf_reference/rt_param_reference/log_level.html" title="log_level"><code class="computeroutput"><span class="identifier">log_level</span></code></a>
            </p></div>
<div id="ftn.boost_test.testing_tools.tools_assertion_severity_level.f2" class="footnote"><p><a href="#boost_test.testing_tools.tools_assertion_severity_level.f2" class="para"><sup class="para">[8] </sup></a>
              in some cases log message can be slightly different to reflect failed
              tool specifics, see <a class="link" href="reports.html" title="Reported information">here</a>
            </p></div>
</div>
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