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<div class="section" id="classic-xunit-style-setup">
<span id="xunitsetup"></span><span id="classic-xunit"></span><h1>classic xunit-style setup<a class="headerlink" href="#classic-xunit-style-setup" title="Permalink to this headline">¶</a></h1>
<p>This section describes a classic and popular way how you can implement
fixtures (setup and teardown test state) on a per-module/class/function basis.
pytest started supporting these methods around 2005 and subsequently
nose and the standard library introduced them (under slightly different
names). While these setup/teardown methods are and will remain fully
supported you may also use pytest’s more powerful <a class="reference internal" href="fixture.html#fixture"><em>fixture mechanism</em></a> which leverages the concept of dependency injection, allowing
for a more modular and more scalable approach for managing test state,
especially for larger projects and for functional testing. You can
mix both fixture mechanisms in the same file but unittest-based
test methods cannot receive fixture arguments.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">As of pytest-2.4, teardownX functions are not called if
setupX existed and failed/was skipped. This harmonizes
behaviour across all major python testing tools.</p>
</div>
<div class="section" id="module-level-setup-teardown">
<h2>Module level setup/teardown<a class="headerlink" href="#module-level-setup-teardown" title="Permalink to this headline">¶</a></h2>
<p>If you have multiple test functions and test classes in a single
module you can optionally implement the following fixture methods
which will usually be called once for all the functions:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">setup_module</span><span class="p">(</span><span class="n">module</span><span class="p">):</span>
<span class="sd">""" setup any state specific to the execution of the given module."""</span>
<span class="k">def</span> <span class="nf">teardown_module</span><span class="p">(</span><span class="n">module</span><span class="p">):</span>
<span class="sd">""" teardown any state that was previously setup with a setup_module</span>
<span class="sd"> method.</span>
<span class="sd"> """</span>
</pre></div>
</div>
</div>
<div class="section" id="class-level-setup-teardown">
<h2>Class level setup/teardown<a class="headerlink" href="#class-level-setup-teardown" title="Permalink to this headline">¶</a></h2>
<p>Similarly, the following methods are called at class level before
and after all test methods of the class are called:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="nd">@classmethod</span>
<span class="k">def</span> <span class="nf">setup_class</span><span class="p">(</span><span class="n">cls</span><span class="p">):</span>
<span class="sd">""" setup any state specific to the execution of the given class (which</span>
<span class="sd"> usually contains tests).</span>
<span class="sd"> """</span>
<span class="nd">@classmethod</span>
<span class="k">def</span> <span class="nf">teardown_class</span><span class="p">(</span><span class="n">cls</span><span class="p">):</span>
<span class="sd">""" teardown any state that was previously setup with a call to</span>
<span class="sd"> setup_class.</span>
<span class="sd"> """</span>
</pre></div>
</div>
</div>
<div class="section" id="method-and-function-level-setup-teardown">
<h2>Method and function level setup/teardown<a class="headerlink" href="#method-and-function-level-setup-teardown" title="Permalink to this headline">¶</a></h2>
<p>Similarly, the following methods are called around each method invocation:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">setup_method</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">method</span><span class="p">):</span>
<span class="sd">""" setup any state tied to the execution of the given method in a</span>
<span class="sd"> class. setup_method is invoked for every test method of a class.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">teardown_method</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">method</span><span class="p">):</span>
<span class="sd">""" teardown any state that was previously setup with a setup_method</span>
<span class="sd"> call.</span>
<span class="sd"> """</span>
</pre></div>
</div>
<p>If you would rather define test functions directly at module level
you can also use the following functions to implement fixtures:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">setup_function</span><span class="p">(</span><span class="n">function</span><span class="p">):</span>
<span class="sd">""" setup any state tied to the execution of the given function.</span>
<span class="sd"> Invoked for every test function in the module.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">teardown_function</span><span class="p">(</span><span class="n">function</span><span class="p">):</span>
<span class="sd">""" teardown any state that was previously setup with a setup_function</span>
<span class="sd"> call.</span>
<span class="sd"> """</span>
</pre></div>
</div>
<p>Note that it is possible for setup/teardown pairs to be invoked multiple times
per testing process.</p>
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<li><a class="reference internal" href="#">classic xunit-style setup</a><ul>
<li><a class="reference internal" href="#module-level-setup-teardown">Module level setup/teardown</a></li>
<li><a class="reference internal" href="#class-level-setup-teardown">Class level setup/teardown</a></li>
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