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<a href="https://github.com/d3vyce/fastapi-toolsets/raw/master/docs/module/pytest.md" title="View source of this page" class="md-content__button md-icon">
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<h1 id="pytest">Pytest<a class="headerlink" href="#pytest" title="Permanent link">&para;</a></h1>
<p>Testing helpers for FastAPI applications with async client, database sessions, and parallel worker support.</p>
<h2 id="installation">Installation<a class="headerlink" href="#installation" title="Permanent link">&para;</a></h2>
<div class="tabbed-set tabbed-alternate" data-tabs="1:2"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">uv</label><label for="__tabbed_1_2">pip</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<div class="language-bash highlight"><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>uv<span class="w"> </span>add<span class="w"> </span><span class="s2">&quot;fastapi-toolsets[pytest]&quot;</span>
</span></code></pre></div>
</div>
<div class="tabbed-block">
<div class="language-bash highlight"><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>pip<span class="w"> </span>install<span class="w"> </span><span class="s2">&quot;fastapi-toolsets[pytest]&quot;</span>
</span></code></pre></div>
</div>
</div>
</div>
<h2 id="overview">Overview<a class="headerlink" href="#overview" title="Permanent link">&para;</a></h2>
<p>The <code>pytest</code> module provides utilities for setting up async test clients, managing test database sessions, and supporting parallel test execution with <code>pytest-xdist</code>.</p>
<h2 id="creating-an-async-client">Creating an async client<a class="headerlink" href="#creating-an-async-client" title="Permanent link">&para;</a></h2>
<p>Use <a href="../../reference/pytest/#fastapi_toolsets.pytest.utils.create_async_client"><code>create_async_client</code></a> to get an <code>httpx.AsyncClient</code> configured for your FastAPI app:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi_toolsets.pytest</span><span class="w"> </span><span class="kn">import</span> <span class="n">create_async_client</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a><span class="nd">@pytest</span><span class="o">.</span><span class="n">fixture</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">http_client</span><span class="p">(</span><span class="n">db_session</span><span class="p">):</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">_override_get_db</span><span class="p">():</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a> <span class="k">yield</span> <span class="n">db_session</span>
</span><span id="__span-2-7"><a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a>
</span><span id="__span-2-8"><a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a> <span class="k">async</span> <span class="k">with</span> <span class="n">create_async_client</span><span class="p">(</span>
</span><span id="__span-2-9"><a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a> <span class="n">app</span><span class="o">=</span><span class="n">app</span><span class="p">,</span>
</span><span id="__span-2-10"><a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a> <span class="n">base_url</span><span class="o">=</span><span class="s2">&quot;http://127.0.0.1/api/v1&quot;</span><span class="p">,</span>
</span><span id="__span-2-11"><a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a> <span class="n">dependency_overrides</span><span class="o">=</span><span class="p">{</span><span class="n">get_db</span><span class="p">:</span> <span class="n">_override_get_db</span><span class="p">},</span>
</span><span id="__span-2-12"><a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a> <span class="p">)</span> <span class="k">as</span> <span class="n">c</span><span class="p">:</span>
</span><span id="__span-2-13"><a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a> <span class="k">yield</span> <span class="n">c</span>
</span></code></pre></div>
<h2 id="database-sessions-in-tests">Database sessions in tests<a class="headerlink" href="#database-sessions-in-tests" title="Permanent link">&para;</a></h2>
<p>Use <a href="../../reference/pytest/#fastapi_toolsets.pytest.utils.create_db_session"><code>create_db_session</code></a> to create an isolated <code>AsyncSession</code> for a test, combined with <a href="../../reference/pytest/#fastapi_toolsets.pytest.utils.create_worker_database"><code>create_worker_database</code></a> to set up a per-worker database:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi_toolsets.pytest</span><span class="w"> </span><span class="kn">import</span> <span class="n">create_worker_database</span><span class="p">,</span> <span class="n">create_db_session</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3" href="#__codelineno-3-3"></a><span class="nd">@pytest</span><span class="o">.</span><span class="n">fixture</span><span class="p">(</span><span class="n">scope</span><span class="o">=</span><span class="s2">&quot;session&quot;</span><span class="p">)</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4" href="#__codelineno-3-4"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">worker_db_url</span><span class="p">():</span>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5" href="#__codelineno-3-5"></a> <span class="k">async</span> <span class="k">with</span> <span class="n">create_worker_database</span><span class="p">(</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6" href="#__codelineno-3-6"></a> <span class="n">database_url</span><span class="o">=</span><span class="nb">str</span><span class="p">(</span><span class="n">settings</span><span class="o">.</span><span class="n">SQLALCHEMY_DATABASE_URI</span><span class="p">)</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7" href="#__codelineno-3-7"></a> <span class="p">)</span> <span class="k">as</span> <span class="n">url</span><span class="p">:</span>
</span><span id="__span-3-8"><a id="__codelineno-3-8" name="__codelineno-3-8" href="#__codelineno-3-8"></a> <span class="k">yield</span> <span class="n">url</span>
</span><span id="__span-3-9"><a id="__codelineno-3-9" name="__codelineno-3-9" href="#__codelineno-3-9"></a>
</span><span id="__span-3-10"><a id="__codelineno-3-10" name="__codelineno-3-10" href="#__codelineno-3-10"></a>
</span><span id="__span-3-11"><a id="__codelineno-3-11" name="__codelineno-3-11" href="#__codelineno-3-11"></a><span class="nd">@pytest</span><span class="o">.</span><span class="n">fixture</span>
</span><span id="__span-3-12"><a id="__codelineno-3-12" name="__codelineno-3-12" href="#__codelineno-3-12"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">db_session</span><span class="p">(</span><span class="n">worker_db_url</span><span class="p">):</span>
</span><span id="__span-3-13"><a id="__codelineno-3-13" name="__codelineno-3-13" href="#__codelineno-3-13"></a> <span class="k">async</span> <span class="k">with</span> <span class="n">create_db_session</span><span class="p">(</span>
</span><span id="__span-3-14"><a id="__codelineno-3-14" name="__codelineno-3-14" href="#__codelineno-3-14"></a> <span class="n">database_url</span><span class="o">=</span><span class="n">worker_db_url</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="n">Base</span><span class="p">,</span> <span class="n">cleanup</span><span class="o">=</span><span class="kc">True</span>
</span><span id="__span-3-15"><a id="__codelineno-3-15" name="__codelineno-3-15" href="#__codelineno-3-15"></a> <span class="p">)</span> <span class="k">as</span> <span class="n">session</span><span class="p">:</span>
</span><span id="__span-3-16"><a id="__codelineno-3-16" name="__codelineno-3-16" href="#__codelineno-3-16"></a> <span class="k">yield</span> <span class="n">session</span>
</span></code></pre></div>
<div class="admonition info">
<p class="admonition-title">Info</p>
<p>In this example, the database is reset between each test using the argument <code>cleanup=True</code>.</p>
</div>
<p>Use <a href="../../reference/pytest/#fastapi_toolsets.pytest.utils.worker_database_url"><code>worker_database_url</code></a> to derive the per-worker URL manually if needed:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi_toolsets.pytest</span><span class="w"> </span><span class="kn">import</span> <span class="n">worker_database_url</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3" href="#__codelineno-4-3"></a><span class="n">url</span> <span class="o">=</span> <span class="n">worker_database_url</span><span class="p">(</span><span class="s2">&quot;postgresql+asyncpg://user:pass@localhost/test_db&quot;</span><span class="p">,</span> <span class="n">default_test_db</span><span class="o">=</span><span class="s2">&quot;test&quot;</span><span class="p">)</span>
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4" href="#__codelineno-4-4"></a><span class="c1"># e.g. &quot;postgresql+asyncpg://user:pass@localhost/test_db_gw0&quot; under xdist</span>
</span></code></pre></div>
<h2 id="parallel-testing-with-pytest-xdist">Parallel testing with pytest-xdist<a class="headerlink" href="#parallel-testing-with-pytest-xdist" title="Permanent link">&para;</a></h2>
<p>The examples above are already compatible with parallel test execution with <code>pytest-xdist</code>.</p>
<h2 id="cleaning-up-tables">Cleaning up tables<a class="headerlink" href="#cleaning-up-tables" title="Permanent link">&para;</a></h2>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Since <code>V2.1.0</code> <code>cleanup_tables</code> now live in <code>fastapi_toolsets.db</code>. For backward compatibility the function is still available in <code>fastapi_toolsets.pytest</code>, but this will be remove in <code>V3.0.0</code>.</p>
</div>
<p>If you want to manually clean up a database you can use <a href="../../reference/db/#fastapi_toolsets.db.cleanup_tables"><code>cleanup_tables</code></a>, this will truncate all tables between tests for fast isolation:</p>
<div class="language-python highlight"><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">fastapi_toolsets.db</span><span class="w"> </span><span class="kn">import</span> <span class="n">cleanup_tables</span>
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a>
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a><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><span id="__span-5-4"><a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">clean</span><span class="p">(</span><span class="n">db_session</span><span class="p">):</span>
</span><span id="__span-5-5"><a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a> <span class="k">yield</span>
</span><span id="__span-5-6"><a id="__codelineno-5-6" name="__codelineno-5-6" href="#__codelineno-5-6"></a> <span class="k">await</span> <span class="n">cleanup_tables</span><span class="p">(</span><span class="n">session</span><span class="o">=</span><span class="n">db_session</span><span class="p">,</span> <span class="n">base</span><span class="o">=</span><span class="n">Base</span><span class="p">)</span>
</span></code></pre></div>
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