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Description text for the PHPUnit Example.

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<h2>PHPUnit for Drupal: A very basic how-to.</h2>

<h3>How to use this example module</h3>
<p>You really should be reading the various documentation comments in the test files.</p>

<h3>How To:</h3>
<ul>
<li><p>PHPUnit tests belong in their own directory, so they will not be loaded
  by the autoloader during normal bootstrap. This means you should have a
  <code>/tests/src</code> directory in the root of your module directory.</p>
</li>

<li><p>Your tests should be in the <code>Drupal\Tests\[your_module]\Unit</code>
  namespace. Under Drupal&#39;s PSR-4 system, this means your PHPUnit-based
  tests should go in a <code>[your_module]/tests/src/Unit</code>
  directory.</p>
</li>
<li><p>Your test case should subclass <code>Drupal\Tests\UnitTestCase</code>.
   </p>
</li>
<li>
  <p>You can run PHPUnit-based tests from within Drupal 8 by enabling the
  Testing module and then selecting the PHPUnit group from the testing page.
  As of this writing, this method does not provide any useful output.
  </p>
</li>
</ul>

<h3>Standard PHPUnit Practices</h3>
<p>You can (and really, should) run PHPUnit from the command line.</p>
<p>On Unix-based systems, this means you need to <code>cd core</code> and then
  <pre><code>./vendor/bin/phpunit</code></pre>
</p>
<p>On Windows-based systems, assuming you have php in your path,
  <pre><code>php ./vendor/phpunit/phpunit/composer/bin/phpunit --group phpunit_example</code></pre>
</p>
<p>Also, you should mark your tests as belonging to a group, so they can be run
   independently. You do this by annotating your test classes with
   <code>@group group_name</code>. You should have a <code>@group</code> for
   your module name, and you should also have a <code>@group</code> for
   integrations, such as <code>views</code>.
</p>
<p>So, for instance, to run all the PHPUnit example tests, you would type
  <pre><code>./vendor/bin/phpunit --group phpunit_example</code></pre>
</p>
<p>As you can see, including a <code>@group</code> annotation is a good idea.</p>

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