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<div class="section" id="testing-with-zope-component">
<h1>Testing with zope.component<a class="headerlink" href="#testing-with-zope-component" title="Permalink to this headline">ΒΆ</a></h1>
<p><a class="reference external" href="http://pypi.python.org/pypi/zope.component">zope.component</a> is a fantastic aspect-oriented library for Python,
however its unit testing support is somewhat convoluted. If you need
to test code that registers adapters, utilities and the like then you
may need to provide a sterile component registry. For historical
reasons, component registries are known as <cite>Site Managers</cite> in
<code class="xref py py-mod docutils literal"><span class="pre">zope.component</span></code>.</p>
<p>TestFixtures provides the a <a class="reference internal" href="api.html#testfixtures.components.TestComponents" title="testfixtures.components.TestComponents"><code class="xref py py-class docutils literal"><span class="pre">TestComponents</span></code></a> helper
which provides just such a sterile registry. It should be instantiated
in your <code class="xref py py-class docutils literal"><span class="pre">TestCase</span></code>‘s <code class="xref py py-meth docutils literal"><span class="pre">setUp()</span></code> method. It’s
<code class="xref py py-meth docutils literal"><span class="pre">uninstall()</span></code> method should be called in the test’s
<code class="xref py py-meth docutils literal"><span class="pre">tearDown()</span></code> method.</p>
<p>Normally, <code class="xref py py-meth docutils literal"><span class="pre">zope.component.getSiteManager()</span></code> returns whatever
the current registry is. This may be influenced by frameworks that use
<code class="xref py py-mod docutils literal"><span class="pre">zope.component</span></code> which can means that unit tests have no
baseline to start with:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">original</span> <span class="o">=</span> <span class="n">getSiteManager</span><span class="p">()</span>
<span class="gp">>>> </span><span class="nb">print</span><span class="p">(</span><span class="n">original</span><span class="p">)</span>
<span class="go"><BaseGlobalComponents base></span>
</pre></div>
</div>
<p>Once we’ve got a <code class="xref py py-class docutils literal"><span class="pre">TestComponents</span></code> in place, we know what
we’re getting:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">components</span> <span class="o">=</span> <span class="n">TestComponents</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">getSiteManager</span><span class="p">()</span>
<span class="go"><Components Testing></span>
</pre></div>
</div>
<p>The registry that <code class="xref py py-func docutils literal"><span class="pre">getSiteManager()</span></code> returns is now also
available as an attribute of the <code class="xref py py-class docutils literal"><span class="pre">TestComponents</span></code>
instance:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">getSiteManager</span><span class="p">()</span> <span class="ow">is</span> <span class="n">components</span><span class="o">.</span><span class="n">registry</span>
<span class="go">True</span>
</pre></div>
</div>
<p>It’s also empty:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="nb">tuple</span><span class="p">(</span><span class="n">components</span><span class="o">.</span><span class="n">registry</span><span class="o">.</span><span class="n">registeredUtilities</span><span class="p">())</span>
<span class="go">()</span>
<span class="gp">>>> </span><span class="nb">tuple</span><span class="p">(</span><span class="n">components</span><span class="o">.</span><span class="n">registry</span><span class="o">.</span><span class="n">registeredAdapters</span><span class="p">())</span>
<span class="go">()</span>
<span class="gp">>>> </span><span class="nb">tuple</span><span class="p">(</span><span class="n">components</span><span class="o">.</span><span class="n">registry</span><span class="o">.</span><span class="n">registeredHandlers</span><span class="p">())</span>
<span class="go">()</span>
</pre></div>
</div>
<p>You can do whatever you like with this registry. When you’re done,
just call the <code class="xref py py-meth docutils literal"><span class="pre">uninstall()</span></code> method:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">components</span><span class="o">.</span><span class="n">uninstall</span><span class="p">()</span>
</pre></div>
</div>
<p>Now you’ll have the original registy back in place:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="n">getSiteManager</span><span class="p">()</span> <span class="ow">is</span> <span class="n">original</span>
<span class="go">True</span>
</pre></div>
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