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<h1 id="testing">Testing<a class="headerlink" href="#testing" title="Permanent link">&para;</a></h1>
<p><code>hexa</code> ships a <strong>zero-mock</strong> pytest suite that exercises the real sample pipelines. The same fixtures make great templates for testing your own pipelines against the container.</p>
<hr />
<h2 id="running-the-suite">🧪 Running the Suite<a class="headerlink" href="#running-the-suite" title="Permanent link">&para;</a></h2>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>python<span class="w"> </span>-m<span class="w"> </span>pytest<span class="w"> </span>tests<span class="w"> </span>-q
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a><span class="c1"># expected: all pass (tests degrade gracefully when samples are absent)</span>
</code></pre></div>
<p>The suite is fully deterministic: no network, no filesystem mocks, no dependency on external fixtures. A couple of tests guard on sample-file existence and skip cleanly otherwise, so the suite stays green in minimal checkouts.</p>
<hr />
<h2 id="whats-covered">📦 What's Covered<a class="headerlink" href="#whats-covered" title="Permanent link">&para;</a></h2>
<table>
<thead>
<tr>
<th>Module</th>
<th>What it proves</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>test_model.py</code></td>
<td><code>PortNode</code>, <code>MethodSpec</code>, nested <code>attributes</code> equality &amp; helpers.</td>
</tr>
<tr>
<td><code>test_parse_yaml.py</code></td>
<td>YAML → tree: minimal spec and the extraction-pipeline grammar (attributes / nested structs / ports / <code>methods:</code>).</td>
</tr>
<tr>
<td><code>test_parse_abc.py</code></td>
<td>ABC module → tree: reflection from <code>__annotations__</code> + <code>@abstractmethod</code>.</td>
</tr>
<tr>
<td><code>test_check_matches.py</code></td>
<td>Two-representation agreement and <code>ValueError</code> on unknown extensions.</td>
</tr>
<tr>
<td><code>test_roundtrip.py</code></td>
<td>Full circle fidelity: <code>parse_yaml → generate_abc → parse_abc → generate_yaml → parse_yaml</code>.</td>
</tr>
<tr>
<td><code>test_container.py</code></td>
<td><code>build</code> behavior: wiring, <code>instances=</code>/<code>config=</code> injection, defaults.</td>
</tr>
</tbody>
</table>
<hr />
<h2 id="the-round-trip-tests">🔁 The Round-Trip Tests<a class="headerlink" href="#the-round-trip-tests" title="Permanent link">&para;</a></h2>
<p>The strongest guarantee lives in <code>test_roundtrip.py</code> — the same tree must survive a full circuit and stay <em>equal</em>, not just lossless:</p>
<ul>
<li><code>test_yaml_to_abc_to_yaml</code> — parse <code>samples/minimal/sample.yaml</code>, generate ABC source, parse it back, re-emit YAML, parse again; the roots and child counts match.</li>
<li><code>test_nested_struct_roundtrip</code> — a nested struct attribute (<code>source</code>) survives YAML → ABC → YAML unchanged:
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a><span class="n">node1</span> <span class="o">=</span> <span class="n">parse_yaml</span><span class="p">(</span><span class="n">yaml_path</span><span class="p">)</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a><span class="k">assert</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node1</span><span class="o">.</span><span class="n">attributes</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">"source"</span><span class="p">),</span> <span class="nb">dict</span><span class="p">)</span>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="o">...</span>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="n">node2</span> <span class="o">=</span> <span class="n">parse_abc</span><span class="p">(</span><span class="n">tmp_abc</span><span class="p">)</span>
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="k">assert</span> <span class="n">node1</span><span class="o">.</span><span class="n">attributes</span><span class="p">[</span><span class="s2">"source"</span><span class="p">]</span> <span class="o">==</span> <span class="n">node2</span><span class="o">.</span><span class="n">attributes</span><span class="p">[</span><span class="s2">"source"</span><span class="p">]</span>
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="k">assert</span> <span class="n">node1</span><span class="o">.</span><span class="n">diff</span><span class="p">(</span><span class="n">node2</span><span class="p">)</span> <span class="o">==</span> <span class="p">[]</span>
</code></pre></div></li>
<li><code>test_abc_to_yaml_to_abc</code> — the mirror circuit starting from <code>samples/minimal/abc.py</code>.</li>
</ul>
<p>These are the tests to keep green when you add a new grammar feature or a new converter.</p>
<hr />
<h2 id="container-tests">🏗️ Container Tests<a class="headerlink" href="#container-tests" title="Permanent link">&para;</a></h2>
<p><code>test_container.py</code> pins the four injection contracts:</p>
<ol>
<li><strong>Wiring with no overrides</strong> (<code>test_build_without_overrides_is_unchanged</code>) — <code>build(_Root)</code> constructs every annotated slot from its type and keeps class defaults.</li>
<li><strong>Runtime injection</strong> (<code>test_build_with_instances_and_config</code>) —
<div class="language-python highlight"><span class="filename">Python</span><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="n">root</span> <span class="o">=</span> <span class="n">build</span><span class="p">(</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a> <span class="n">_Root</span><span class="p">,</span>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a> <span class="n">instances</span><span class="o">=</span><span class="p">{</span><span class="s2">"repo"</span><span class="p">:</span> <span class="n">repo</span><span class="p">},</span>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a> <span class="n">config</span><span class="o">=</span><span class="p">{</span><span class="s2">"retries"</span><span class="p">:</span> <span class="mi">3</span><span class="p">,</span> <span class="s2">"label"</span><span class="p">:</span> <span class="s2">"fast"</span><span class="p">,</span> <span class="s2">"threshold"</span><span class="p">:</span> <span class="mf">2.5</span><span class="p">},</span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a><span class="p">)</span>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a><span class="k">assert</span> <span class="n">root</span><span class="o">.</span><span class="n">repo</span> <span class="ow">is</span> <span class="n">repo</span> <span class="c1"># injected verbatim</span>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a><span class="k">assert</span> <span class="n">root</span><span class="o">.</span><span class="n">mid</span><span class="o">.</span><span class="n">threshold</span> <span class="o">==</span> <span class="mf">2.5</span> <span class="c1"># config propagated by name into nested nodes</span>
</code></pre></div></li>
<li><strong>Typing-generic config fields</strong> (<code>test_config_applies_to_typing_generic_annotations</code>) — <code>str | None</code>/<code>list | None</code> fields take <code>config</code> values and leave unset ones at their defaults.</li>
<li><strong>Optional defaults</strong> (<code>test_config_optional_field_defaulted_to_none_when_unprovided</code>) — unprovided optional fields default to <code>None</code>.</li>
</ol>
<p>The <code>_Root</code>/<code>_Mid</code>/<code>_Leaf</code> fixture classes live right in the test file — a great minimal template for testing your own annotated pipelines.</p>
<hr />
<h2 id="tips">💡 Tips<a class="headerlink" href="#tips" title="Permanent link">&para;</a></h2>
<ul>
<li>Keep fixture classes small and place them in the test module (like <code>_Root</code>, <code>_Repo</code>, <code>_OptionalConfig</code>). No fixtures framework needed for the container tests.</li>
<li>Add <code>hexa check &lt;spec.yaml&gt; &lt;abc.py&gt;</code> to CI as a live example of the guard, then assert on the return with <code>is True</code>.</li>
<li>When extending the YAML grammar, add a case to both <code>test_parse_yaml.py</code> and a round-trip test — if the round-trip holds, the converter pair is consistent <em>by construction</em>.</li>
</ul>
<hr />
<h2 id="related">Related<a class="headerlink" href="#related" title="Permanent link">&para;</a></h2>
<ul>
<li><a href="../02_components/">02 Core Components</a> · <a href="../06_best_practices/">06 Best Practices</a> · <a href="../07_error_handling/">07 Error Handling</a></li>
</ul>
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