gecko/python/mock-1.0.0/html/sentinel.html
2012-10-29 11:12:30 -04:00

156 lines
7.1 KiB
HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Sentinel &mdash; Mock 1.0.0 documentation</title>
<link rel="stylesheet" href="_static/nature.css" type="text/css" />
<link rel="stylesheet" href="_static/pygments.css" type="text/css" />
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT: '',
VERSION: '1.0.0',
COLLAPSE_INDEX: false,
FILE_SUFFIX: '.html',
HAS_SOURCE: true
};
</script>
<script type="text/javascript" src="_static/jquery.js"></script>
<script type="text/javascript" src="_static/underscore.js"></script>
<script type="text/javascript" src="_static/doctools.js"></script>
<link rel="top" title="Mock 1.0.0 documentation" href="index.html" />
<link rel="next" title="Mocking Magic Methods" href="magicmock.html" />
<link rel="prev" title="Helpers" href="helpers.html" />
</head>
<body>
<div class="related">
<h3>Navigation</h3>
<ul>
<li class="right" style="margin-right: 10px">
<a href="genindex.html" title="General Index"
accesskey="I">index</a></li>
<li class="right" >
<a href="magicmock.html" title="Mocking Magic Methods"
accesskey="N">next</a> |</li>
<li class="right" >
<a href="helpers.html" title="Helpers"
accesskey="P">previous</a> |</li>
<li><a href="index.html">Mock 1.0.0 documentation</a> &raquo;</li>
</ul>
</div>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body">
<div class="section" id="sentinel">
<h1>Sentinel<a class="headerlink" href="#sentinel" title="Permalink to this headline"></a></h1>
<dl class="data">
<dt id="mock.sentinel">
<tt class="descname">sentinel</tt><a class="headerlink" href="#mock.sentinel" title="Permalink to this definition"></a></dt>
<dd><p>The <tt class="docutils literal"><span class="pre">sentinel</span></tt> object provides a convenient way of providing unique
objects for your tests.</p>
<p>Attributes are created on demand when you access them by name. Accessing
the same attribute will always return the same object. The objects
returned have a sensible repr so that test failure messages are readable.</p>
</dd></dl>
<dl class="data">
<dt id="mock.DEFAULT">
<tt class="descname">DEFAULT</tt><a class="headerlink" href="#mock.DEFAULT" title="Permalink to this definition"></a></dt>
<dd><p>The <cite>DEFAULT</cite> object is a pre-created sentinel (actually
<cite>sentinel.DEFAULT</cite>). It can be used by <a class="reference internal" href="mock.html#mock.Mock.side_effect" title="mock.Mock.side_effect"><tt class="xref py py-attr docutils literal"><span class="pre">side_effect</span></tt></a>
functions to indicate that the normal return value should be used.</p>
</dd></dl>
<div class="section" id="sentinel-example">
<h2>Sentinel Example<a class="headerlink" href="#sentinel-example" title="Permalink to this headline"></a></h2>
<p>Sometimes when testing you need to test that a specific object is passed as an
argument to another method, or returned. It can be common to create named
sentinel objects to test this. <cite>sentinel</cite> provides a convenient way of
creating and testing the identity of objects like this.</p>
<p>In this example we monkey patch <cite>method</cite> to return
<cite>sentinel.some_object</cite>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">real</span> <span class="o">=</span> <span class="n">ProductionClass</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span><span class="o">.</span><span class="n">method</span> <span class="o">=</span> <span class="n">Mock</span><span class="p">(</span><span class="n">name</span><span class="o">=</span><span class="s">&quot;method&quot;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">real</span><span class="o">.</span><span class="n">method</span><span class="o">.</span><span class="n">return_value</span> <span class="o">=</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">some_object</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">result</span> <span class="o">=</span> <span class="n">real</span><span class="o">.</span><span class="n">method</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="k">assert</span> <span class="n">result</span> <span class="ow">is</span> <span class="n">sentinel</span><span class="o">.</span><span class="n">some_object</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">sentinel</span><span class="o">.</span><span class="n">some_object</span>
<span class="go">sentinel.some_object</span>
</pre></div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="sphinxsidebar">
<div class="sphinxsidebarwrapper">
<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Sentinel</a><ul>
<li><a class="reference internal" href="#sentinel-example">Sentinel Example</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="helpers.html"
title="previous chapter">Helpers</a></p>
<h4>Next topic</h4>
<p class="topless"><a href="magicmock.html"
title="next chapter">Mocking Magic Methods</a></p>
<h3>This Page</h3>
<ul class="this-page-menu">
<li><a href="_sources/sentinel.txt"
rel="nofollow">Show Source</a></li>
</ul>
<div id="searchbox" style="display: none">
<h3>Quick search</h3>
<form class="search" action="search.html" method="get">
<input type="text" name="q" />
<input type="submit" value="Go" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
<p class="searchtip" style="font-size: 90%">
Enter search terms or a module, class or function name.
</p>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
</div>
</div>
<div class="clearer"></div>
</div>
<div class="related">
<h3>Navigation</h3>
<ul>
<li class="right" style="margin-right: 10px">
<a href="genindex.html" title="General Index"
>index</a></li>
<li class="right" >
<a href="magicmock.html" title="Mocking Magic Methods"
>next</a> |</li>
<li class="right" >
<a href="helpers.html" title="Helpers"
>previous</a> |</li>
<li><a href="index.html">Mock 1.0.0 documentation</a> &raquo;</li>
</ul>
</div>
<div class="footer">
&copy; Copyright 2007-2012, Michael Foord &amp; the mock team.
Last updated on Oct 07, 2012.
Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.1.3.
</div>
</body>
</html>