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<title>Test Functions — Jinja Documentation</title>
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<div id="content">
<h1 class="heading"><span>Jinja</span></h1>
<h2 class="subheading">Test Functions</h2>
<div id="toc">
<h2>Navigation</h2>
<ul>
<li><a href="index.html">back to index</a></li>
</ul>
<h2>Contents</h2>
<ul class="contents">
<li><a href="#writing-test-functions">Writing Test Functions</a></li>
</ul>
</div>
<div id="contentwrapper">
<p>In addition to filters, Jinja also supports test functions. Test functions
always return either <tt class="docutils literal"><span class="pre">True</span></tt> or <tt class="docutils literal"><span class="pre">False</span></tt>. Inside the template they are available
using the <cite>is</cite> operator.</p>
<p>Jinja comes with some builtin tests listed in the <a class="reference" href="./builtins.html">designer documentation</a>.</p>
<div class="section">
<h2><a id="writing-test-functions" name="writing-test-functions">Writing Test Functions</a></h2>
<p>Test functions look exactly like filters mentioned in the <a class="reference" href="./filters.html">filter documentation</a>:</p>
<div class="syntax"><pre><span class="k">def</span> <span class="nf">is_even</span><span class="p">():</span>
<span class="k">def</span> <span class="nf">wrapped</span><span class="p">(</span><span class="n">env</span><span class="p">,</span> <span class="n">context</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="n">value</span> <span class="o">%</span> <span class="mf">2</span> <span class="o">==</span> <span class="mf">0</span>
<span class="k">return</span> <span class="n">wrapped</span>
</pre></div>
<p>Now you have to register that test on an environment:</p>
<div class="syntax"><pre><span class="n">env</span><span class="o">.</span><span class="n">tests</span><span class="p">[</span><span class="s">'even'</span><span class="p">]</span> <span class="o">=</span> <span class="n">is_even</span>
</pre></div>
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