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<div class="section" id="doctest-integration-for-modules-and-test-files">
<h1>Doctest integration for modules and test files<a class="headerlink" href="#doctest-integration-for-modules-and-test-files" title="Permalink to this headline">¶</a></h1>
<p>By default all files matching the <code class="docutils literal"><span class="pre">test*.txt</span></code> pattern will
be run through the python standard <code class="docutils literal"><span class="pre">doctest</span></code> module. You
can change the pattern by issuing:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">pytest</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">glob</span><span class="o">=</span><span class="s1">'*.rst'</span>
</pre></div>
</div>
<p>on the command line. Since version <code class="docutils literal"><span class="pre">2.9</span></code>, <code class="docutils literal"><span class="pre">--doctest-glob</span></code>
can be given multiple times in the command-line.</p>
<p>You can also trigger running of doctests
from docstrings in all python modules (including regular
python test modules):</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">pytest</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">modules</span>
</pre></div>
</div>
<p>You can make these changes permanent in your project by
putting them into a pytest.ini file like this:</p>
<div class="highlight-ini"><div class="highlight"><pre><span></span><span class="c1"># content of pytest.ini</span>
<span class="k">[pytest]</span>
<span class="na">addopts</span> <span class="o">=</span> <span class="s">--doctest-modules</span>
</pre></div>
</div>
<p>If you then have a text file like this:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># content of example.rst</span>
<span class="n">hello</span> <span class="n">this</span> <span class="ow">is</span> <span class="n">a</span> <span class="n">doctest</span>
<span class="o">>>></span> <span class="n">x</span> <span class="o">=</span> <span class="mi">3</span>
<span class="o">>>></span> <span class="n">x</span>
<span class="mi">3</span>
</pre></div>
</div>
<p>and another like this:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># content of mymodule.py</span>
<span class="k">def</span> <span class="nf">something</span><span class="p">():</span>
<span class="sd">""" a doctest in a docstring</span>
<span class="sd"> >>> something()</span>
<span class="sd"> 42</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="mi">42</span>
</pre></div>
</div>
<p>then you can just invoke <code class="docutils literal"><span class="pre">pytest</span></code> without command line options:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span>$ pytest
======= test session starts ========
platform linux -- Python 3.5.2, pytest-3.0.6, py-1.4.33, pluggy-0.4.0
rootdir: $REGENDOC_TMPDIR, inifile: pytest.ini
collected 1 items
mymodule.py .
======= 1 passed in 0.12 seconds ========
</pre></div>
</div>
<p>It is possible to use fixtures using the <code class="docutils literal"><span class="pre">getfixture</span></code> helper:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># content of example.rst</span>
<span class="o">>>></span> <span class="n">tmp</span> <span class="o">=</span> <span class="n">getfixture</span><span class="p">(</span><span class="s1">'tmpdir'</span><span class="p">)</span>
<span class="o">>>></span> <span class="o">...</span>
<span class="o">>>></span>
</pre></div>
</div>
<p>Also, <a class="reference internal" href="fixture.html#usefixtures"><span class="std std-ref">Using fixtures from classes, modules or projects</span></a> and <a class="reference internal" href="fixture.html#autouse"><span class="std std-ref">Autouse fixtures (xUnit setup on steroids)</span></a> fixtures are supported
when executing text doctest files.</p>
<p>The standard <code class="docutils literal"><span class="pre">doctest</span></code> module provides some setting flags to configure the
strictness of doctest tests. In pytest You can enable those flags those flags
using the configuration file. To make pytest ignore trailing whitespaces and
ignore lengthy exception stack traces you can just write:</p>
<div class="highlight-ini"><div class="highlight"><pre><span></span><span class="k">[pytest]</span>
<span class="na">doctest_optionflags</span><span class="o">=</span> <span class="s">NORMALIZE_WHITESPACE IGNORE_EXCEPTION_DETAIL</span>
</pre></div>
</div>
<p>pytest also introduces new options to allow doctests to run in Python 2 and
Python 3 unchanged:</p>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">ALLOW_UNICODE</span></code>: when enabled, the <code class="docutils literal"><span class="pre">u</span></code> prefix is stripped from unicode
strings in expected doctest output.</li>
<li><code class="docutils literal"><span class="pre">ALLOW_BYTES</span></code>: when enabled, the <code class="docutils literal"><span class="pre">b</span></code> prefix is stripped from byte strings
in expected doctest output.</li>
</ul>
<p>As with any other option flag, these flags can be enabled in <code class="docutils literal"><span class="pre">pytest.ini</span></code> using
the <code class="docutils literal"><span class="pre">doctest_optionflags</span></code> ini option:</p>
<div class="highlight-ini"><div class="highlight"><pre><span></span><span class="k">[pytest]</span>
<span class="na">doctest_optionflags</span> <span class="o">=</span> <span class="s">ALLOW_UNICODE ALLOW_BYTES</span>
</pre></div>
</div>
<p>Alternatively, it can be enabled by an inline comment in the doc test
itself:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># content of example.rst</span>
<span class="o">>>></span> <span class="n">get_unicode_greeting</span><span class="p">()</span> <span class="c1"># doctest: +ALLOW_UNICODE</span>
<span class="s1">'Hello'</span>
</pre></div>
</div>
<div class="section" id="the-doctest-namespace-fixture">
<h2>The ‘doctest_namespace’ fixture<a class="headerlink" href="#the-doctest-namespace-fixture" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified">New in version 3.0.</span></p>
</div>
<p>The <code class="docutils literal"><span class="pre">doctest_namespace</span></code> fixture can be used to inject items into the
namespace in which your doctests run. It is intended to be used within
your own fixtures to provide the tests that use them with context.</p>
<p><code class="docutils literal"><span class="pre">doctest_namespace</span></code> is a standard <code class="docutils literal"><span class="pre">dict</span></code> object into which you
place the objects you want to appear in the doctest namespace:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># content of conftest.py</span>
<span class="kn">import</span> <span class="nn">numpy</span>
<span class="nd">@pytest</span><span class="o">.</span><span class="n">fixture</span><span class="p">(</span><span class="n">autouse</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">add_np</span><span class="p">(</span><span class="n">doctest_namespace</span><span class="p">):</span>
<span class="n">doctest_namespace</span><span class="p">[</span><span class="s1">'np'</span><span class="p">]</span> <span class="o">=</span> <span class="n">numpy</span>
</pre></div>
</div>
<p>which can then be used in your doctests directly:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># content of numpy.py</span>
<span class="k">def</span> <span class="nf">arange</span><span class="p">():</span>
<span class="sd">"""</span>
<span class="sd"> >>> a = np.arange(10)</span>
<span class="sd"> >>> len(a)</span>
<span class="sd"> 10</span>
<span class="sd"> """</span>
<span class="k">pass</span>
</pre></div>
</div>
</div>
<div class="section" id="output-format">
<h2>Output format<a class="headerlink" href="#output-format" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified">New in version 3.0.</span></p>
</div>
<p>You can change the diff output format on failure for your doctests
by using one of standard doctest modules format in options
(see <a class="reference external" href="http://docs.python.org/library/doctest.html#doctest.REPORT_UDIFF" title="(in Python v2.7)"><code class="docutils literal"><span class="pre">doctest.REPORT_UDIFF</span></code></a>, <a class="reference external" href="http://docs.python.org/library/doctest.html#doctest.REPORT_CDIFF" title="(in Python v2.7)"><code class="docutils literal"><span class="pre">doctest.REPORT_CDIFF</span></code></a>,
<a class="reference external" href="http://docs.python.org/library/doctest.html#doctest.REPORT_NDIFF" title="(in Python v2.7)"><code class="docutils literal"><span class="pre">doctest.REPORT_NDIFF</span></code></a>, <a class="reference external" href="http://docs.python.org/library/doctest.html#doctest.REPORT_ONLY_FIRST_FAILURE" title="(in Python v2.7)"><code class="docutils literal"><span class="pre">doctest.REPORT_ONLY_FIRST_FAILURE</span></code></a>):</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">pytest</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">modules</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">report</span> <span class="n">none</span>
<span class="n">pytest</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">modules</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">report</span> <span class="n">udiff</span>
<span class="n">pytest</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">modules</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">report</span> <span class="n">cdiff</span>
<span class="n">pytest</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">modules</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">report</span> <span class="n">ndiff</span>
<span class="n">pytest</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">modules</span> <span class="o">--</span><span class="n">doctest</span><span class="o">-</span><span class="n">report</span> <span class="n">only_first_failure</span>
</pre></div>
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<li><a class="reference internal" href="#">Doctest integration for modules and test files</a><ul>
<li><a class="reference internal" href="#the-doctest-namespace-fixture">The ‘doctest_namespace’ fixture</a></li>
<li><a class="reference internal" href="#output-format">Output format</a></li>
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