<!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>A sesssion-fixture which can look at all collected tests</title> <link rel="stylesheet" href="../_static/sphinxdoc.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.3.4.1', 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="None" href="../index.html" /> <link rel="up" title="Usages and Examples" href="index.html" /> <link rel="next" title="Changing standard (Python) test discovery" href="pythoncollection.html" /> <link rel="prev" title="Working with custom markers" href="markers.html" /> </head> <body> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="pythoncollection.html" title="Changing standard (Python) test discovery" accesskey="N">next</a></li> <li class="right" > <a href="markers.html" title="Working with custom markers" accesskey="P">previous</a> |</li> <li><a href="../contents.html">pytest-2.3.4.1</a> »</li> <li><a href="index.html" accesskey="U">Usages and Examples</a> »</li> <g:plusone></g:plusone> </ul> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <div id="searchbox" style="display: none"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" size="18" /> <input type="submit" value="Search" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('#searchbox').show(0);</script> <h3>quicklinks</h3> <div style="text-align: left; font-size: 100%; vertical-align: middle;"> <table> <tr> <td> <a href="../index.html">home</a> </td><td> <a href="../contents.html">TOC/contents</a> </td></tr><tr><td> <a href="../getting-started.html">install</a> </td><td> <a href="../changelog.html">changelog</a> </td></tr><tr><td> <a href="index.html">examples</a> </td><td> <a href="../customize.html">customize</a> </td></tr><tr><td> <a href="https://bitbucket.org/hpk42/pytest/issues?status=new&status=open">issues[bb]</a> </td><td> <a href="../contact.html">contact</a> </td></tr></table> </div> <h4>Previous topic</h4> <p class="topless"><a href="markers.html" title="previous chapter">Working with custom markers</a></p> <h4>Next topic</h4> <p class="topless"><a href="pythoncollection.html" title="next chapter">Changing standard (Python) test discovery</a></p> </div> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="a-sesssion-fixture-which-can-look-at-all-collected-tests"> <h1>A sesssion-fixture which can look at all collected tests<a class="headerlink" href="#a-sesssion-fixture-which-can-look-at-all-collected-tests" title="Permalink to this headline">ΒΆ</a></h1> <p>A session-scoped fixture effectively has access to all collected test items. Here is an example of a fixture function which walks all collected tests and looks if their test class defines a <tt class="docutils literal"><span class="pre">callme</span></tt> method and calls it:</p> <div class="highlight-python"><div class="highlight"><pre><span class="c"># content of conftest.py</span> <span class="kn">import</span> <span class="nn">pytest</span> <span class="nd">@pytest.fixture</span><span class="p">(</span><span class="n">scope</span><span class="o">=</span><span class="s">"session"</span><span class="p">,</span> <span class="n">autouse</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span> <span class="k">def</span> <span class="nf">callattr_ahead_of_alltests</span><span class="p">(</span><span class="n">request</span><span class="p">):</span> <span class="k">print</span> <span class="s">"callattr_ahead_of_alltests called"</span> <span class="n">seen</span> <span class="o">=</span> <span class="nb">set</span><span class="p">([</span><span class="bp">None</span><span class="p">])</span> <span class="n">session</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">node</span> <span class="k">for</span> <span class="n">item</span> <span class="ow">in</span> <span class="n">session</span><span class="o">.</span><span class="n">items</span><span class="p">:</span> <span class="n">cls</span> <span class="o">=</span> <span class="n">item</span><span class="o">.</span><span class="n">getparent</span><span class="p">(</span><span class="n">pytest</span><span class="o">.</span><span class="n">Class</span><span class="p">)</span> <span class="k">if</span> <span class="n">cls</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">seen</span><span class="p">:</span> <span class="k">if</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">cls</span><span class="o">.</span><span class="n">obj</span><span class="p">,</span> <span class="s">"callme"</span><span class="p">):</span> <span class="n">cls</span><span class="o">.</span><span class="n">obj</span><span class="o">.</span><span class="n">callme</span><span class="p">()</span> <span class="n">seen</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">cls</span><span class="p">)</span> </pre></div> </div> <p>test classes may now define a <tt class="docutils literal"><span class="pre">callme</span></tt> method which will be called ahead of running any tests:</p> <div class="highlight-python"><div class="highlight"><pre><span class="c"># content of test_module.py</span> <span class="k">class</span> <span class="nc">TestHello</span><span class="p">:</span> <span class="nd">@classmethod</span> <span class="k">def</span> <span class="nf">callme</span><span class="p">(</span><span class="n">cls</span><span class="p">):</span> <span class="k">print</span> <span class="s">"callme called!"</span> <span class="k">def</span> <span class="nf">test_method1</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">print</span> <span class="s">"test_method1 called"</span> <span class="k">def</span> <span class="nf">test_method2</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">print</span> <span class="s">"test_method1 called"</span> <span class="k">class</span> <span class="nc">TestOther</span><span class="p">:</span> <span class="nd">@classmethod</span> <span class="k">def</span> <span class="nf">callme</span><span class="p">(</span><span class="n">cls</span><span class="p">):</span> <span class="k">print</span> <span class="s">"callme other called"</span> <span class="k">def</span> <span class="nf">test_other</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">print</span> <span class="s">"test other"</span> <span class="c"># works with unittest as well ...</span> <span class="kn">import</span> <span class="nn">unittest</span> <span class="k">class</span> <span class="nc">SomeTest</span><span class="p">(</span><span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span> <span class="nd">@classmethod</span> <span class="k">def</span> <span class="nf">callme</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">print</span> <span class="s">"SomeTest callme called"</span> <span class="k">def</span> <span class="nf">test_unit1</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="k">print</span> <span class="s">"test_unit1 method called"</span> </pre></div> </div> <p>If you run this without output capturing:</p> <div class="highlight-python"><pre>$ py.test -q -s test_module.py .... callattr_ahead_of_alltests called callme called! callme other called SomeTest callme called test_method1 called test_method1 called test other test_unit1 method called</pre> </div> </div> </div> </div> </div> <div class="clearer"></div> </div> <div class="related"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="pythoncollection.html" title="Changing standard (Python) test discovery" >next</a></li> <li class="right" > <a href="markers.html" title="Working with custom markers" >previous</a> |</li> <li><a href="../contents.html">pytest-2.3.4.1</a> »</li> <li><a href="index.html" >Usages and Examples</a> »</li> <g:plusone></g:plusone> </ul> </div> <div class="footer"> © Copyright 2012, holger krekel. 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