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  <mainDescription>&lt;p&gt;
    &lt;a class=&quot;PresentationName&quot; guid=&quot;{D156652E-7C52-4EBD-8F23-F38169877A57}&quot;&gt;XP Unit Test&lt;/a&gt;s are usually implemented at
    the class level (in OO languages) and test the public interface. For every class in the system, a test class exists.
    Popular test frameworks are available usually for free (such as JUnit, CppUnit, CppUnitLite, NUnit). These are simple
    tools that help the developer to organize and run unit tests. These tests drive the programmer development and tell the
    programmer that the code works as the programmer expects.
&lt;/p&gt;</mainDescription>
  <purpose>&lt;a id=&quot;XE_xp_unit_test__artifact_definition&quot; name=&quot;XE_xp_unit_test__artifact_definition&quot;&gt;&lt;/a&gt;&lt;a id=&quot;Purpose&quot;
name=&quot;Purpose&quot;&gt;&lt;/a&gt;&lt;a id=&quot;XE_xp_unit_test__purpose_of&quot; name=&quot;XE_xp_unit_test__purpose_of&quot;&gt;&lt;/a&gt; 
&lt;p&gt;
    An &lt;a class=&quot;PresentationName&quot; guid=&quot;{D156652E-7C52-4EBD-8F23-F38169877A57}&quot;&gt;XP Unit Test&lt;/a&gt; is written by developers
    to ensure that all system components work as expected. &lt;a class=&quot;PresentationName&quot;
    guid=&quot;{D156652E-7C52-4EBD-8F23-F38169877A57}&quot;&gt;XP Unit Test&lt;/a&gt; give the developers the confidence to modify the system
    and feel confident that everything still works.
&lt;/p&gt;</purpose>
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