docker-mailserver/edge/contributing/tests/index.html
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<h1>Tests</h1>
<div class="admonition quote">
<p class="admonition-title"><em>Program testing can be used to show the presence of bugs, but never to show their absence!</em></p>
<p> Edsger Wybe Dijkstra</p>
</div>
<h2 id="introduction"><a class="toclink" href="#introduction">Introduction</a></h2>
<p>DMS employs a variety of unit and integration tests. All tests and associated configuration is stored in the <code>test/</code> directory. If you want to change existing functionality or integrate a new feature into DMS, you will probably need to work with our test suite.</p>
<div class="admonition question">
<p class="admonition-title">Can I use macOS?</p>
<p>We do not support running linting, tests, etc. on macOS at this time. Please use a Linux VM, Debian/Ubuntu is recommended.</p>
</div>
<h3 id="about"><a class="toclink" href="#about">About</a></h3>
<p>We use <a href="https://github.com/bats-core/bats-core">BATS</a> (<em>Bash Automated Testing System</em>) and additional support libraries. BATS is very similar to Bash, and one can easily and quickly get an understanding of how tests in a single file are run. A <a href="https://github.com/docker-mailserver/docker-mailserver/blob/master/test/tests/parallel/set2/template.bats">test file template</a> provides a minimal working example for newcomers to look at.</p>
<h3 id="structure"><a class="toclink" href="#structure">Structure</a></h3>
<p>The <code>test/</code> directory contains multiple directories. Among them is the <code>bats/</code> directory (<em>which is the <a href="https://github.com/bats-core/bats-core">BATS</a> git submodule</em>) and the <code>helper/</code> directory. The latter is especially interesting because it contains common support functionality used in almost every test. Actual tests are located in <code>test/tests/</code>.</p>
<div class="admonition warning">
<p class="admonition-title">Test suite undergoing refactoring</p>
<p>We are currently in the process of restructuring all of our tests. Tests will be moved into <code>test/tests/parallel/</code> and new tests should be placed there as well.</p>
</div>
<h3 id="using-our-helper-functions"><a class="toclink" href="#using-our-helper-functions">Using Our Helper Functions</a></h3>
<p>There are many functions that aid in writing tests. <strong>We urge you to use them!</strong> They will not only ease writing a test but they will also do their best to ensure there are no race conditions or other unwanted side effects. To learn about the functions we provide, you can:</p>
<ol>
<li>look into existing tests for helper functions we already used</li>
<li>look into the <code>test/helper/</code> directory which contains all files that can (and will) be loaded in test files</li>
</ol>
<p>We encourage you to try both of the approaches mentioned above. To make understanding and using the helper functions easy, every function contains detailed documentation comments. Read them carefully!</p>
<h3 id="how-are-tests-run"><a class="toclink" href="#how-are-tests-run">How Are Tests Run?</a></h3>
<p>Tests are split into two categories:</p>
<ul>
<li><strong><code>test/tests/parallel/</code>:</strong> Multiple test files are run concurrently to reduce the required time to complete the test suite. A test file will presently run it's own defined test-cases in a sequential order.</li>
<li><strong><code>test/tests/serial/</code>:</strong> Each test file is queued up to run sequentially. Tests that are unable to support running concurrently belong here.</li>
</ul>
<p>Parallel tests are further partitioned into smaller sets. If your system has the resources to support running more than one of those sets at a time this is perfectly ok (<em>our CI runs tests by distributing the sets across multiple test runners</em>). Care must be taken not to mix running the serial tests while a parallel set is also running; this is handled for you when using <code>make tests</code>.</p>
<h2 id="running-tests"><a class="toclink" href="#running-tests">Running Tests</a></h2>
<h3 id="prerequisites"><a class="toclink" href="#prerequisites">Prerequisites</a></h3>
<p>To run the test suite, you will need to:</p>
<ol>
<li><a href="https://docs.docker.com/get-docker/">Install Docker</a></li>
<li>Install <code>jq</code> and (GNU) <code>parallel</code> (under Ubuntu, use <code>sudo apt-get -y install jq parallel</code>)</li>
<li>Execute <code>git submodule update --init --recursive</code> if you haven't already initialized the git submodules</li>
</ol>
<h3 id="executing-tests"><a class="toclink" href="#executing-tests">Executing Test(s)</a></h3>
<p>We use <code>make</code> to run commands.</p>
<ol>
<li>Run <code>make build</code> to create or update the local <code>mailserver-testing:ci</code> Docker image (<em>using the projects <code>Dockerfile</code></em>)</li>
<li>Run all tests: <code>make clean tests</code></li>
<li>Run a single test: <code>make clean generate-accounts test/&lt;TEST NAME WITHOUT .bats SUFFIX&gt;</code></li>
<li>Run multiple unrelated tests: <code>make clean generate-accounts test/&lt;TEST NAME WITHOUT .bats SUFFIX&gt;,&lt;TEST NAME WITHOUT .bats SUFFIX&gt;</code> (just add a <code>,</code> and then immediately write the new test name)</li>
<li>Run a whole set or all serial tests: <code>make clean generate-accounts tests/parallel/setX</code> where <code>X</code> is the number of the set or <code>make clean generate-accounts tests/serial</code></li>
</ol>
<details class="tip">
<summary>Setting the Degree of Parallelization for Tests</summary>
<p>If your machine is capable, you can increase the amount of tests that are run simultaneously by prepending the <code>make clean all</code> command with <code>BATS_PARALLEL_JOBS=X</code> (i.e. <code>BATS_PARALLEL_JOBS=X make clean all</code>). This wil speed up the test procedure. You can also run all tests in serial by setting <code>BATS_PARALLEL_JOBS=1</code> this way.</p>
<p>The default value of <code>BATS_PARALLEL_JOBS</code> is 2. This can be increased if your system has the resources spare to support running more jobs at once to complete the test suite sooner.</p>
</details>
<div class="admonition warning">
<p class="admonition-title">Test Output when Running in Parallel</p>
<p><a href="https://bats-core.readthedocs.io/en/v1.8.2/usage.html#parallel-execution">When running tests in parallel</a> (<em>with <code>make clean generate-accounts tests/parallel/setX</code></em>), BATS will delay outputting the results until completing all test cases within a file.</p>
<p>This likewise delays the reporting of test-case failures. When troubleshooting parallel set tests, you may prefer to run specific tests you're working on serially (<em>as demonstrated in the example below</em>).</p>
<p>When writing tests, ensure that parallel set tests still pass when run in parallel. You need to account for other tests running in parallel that may interfere with your own tests logic.</p>
</div>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>You may use <code>make run-local-instance</code> to run a version of the image built locally to test and edit your changes in a running DMS instance.</p>
</div>
<h3 id="an-example"><a class="toclink" href="#an-example">An Example</a></h3>
<p>In this example, you've made a change to the Rspamd feature support (<em>or adjusted it's tests</em>). First verify no regressions have been introduced by running it's specific test file:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>make<span class="w"> </span>clean<span class="w"> </span>generate-accounts<span class="w"> </span>test/rspamd
<span class="go">rspamd.bats</span>
<span class="go"> ✓ [Rspamd] Postfix&#39;s main.cf was adjusted [12]</span>
<span class="go"> ✓ [Rspamd] normal mail passes fine [44]</span>
<span class="go"> ✓ [Rspamd] detects and rejects spam [122]</span>
<span class="go"> ✓ [Rspamd] detects and rejects virus [189]</span>
</code></pre></div>
<p>As your feature work progresses your change for Rspamd also affects ClamAV. As your change now spans more than just the Rspamd test file, you could run multiple test files serially:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>make<span class="w"> </span>clean<span class="w"> </span>generate-accounts<span class="w"> </span>test/rspamd,clamav
<span class="go">rspamd.bats</span>
<span class="go"> ✓ [Rspamd] Postfix&#39;s main.cf was adjusted [12]</span>
<span class="go"> ✓ [Rspamd] normal mail passes fine [44]</span>
<span class="go"> ✓ [Rspamd] detects and rejects spam [122]</span>
<span class="go"> ✓ [Rspamd] detects and rejects virus [189]</span>
<span class="go">clamav.bats</span>
<span class="go"> ✓ [ClamAV] log files exist at /var/log/mail directory [68]</span>
<span class="go"> ✓ [ClamAV] should be identified by Amavis [67]</span>
<span class="go"> ✓ [ClamAV] freshclam cron is enabled [76]</span>
<span class="go"> ✓ [ClamAV] env CLAMAV_MESSAGE_SIZE_LIMIT is set correctly [63]</span>
<span class="go"> ✓ [ClamAV] rejects virus [60]</span>
</code></pre></div>
<p>You're almost finished with your change before submitting it as a PR. It's a good idea to run the full parallel set those individual tests belong to (<em>especially if you've modified any tests</em>):</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>make<span class="w"> </span>clean<span class="w"> </span>generate-accounts<span class="w"> </span>tests/parallel/set1
<span class="go">default_relay_host.bats</span>
<span class="go"> ✓ [Relay] (ENV) &#39;DEFAULT_RELAY_HOST&#39; should configure &#39;main.cf:relayhost&#39; [88]</span>
<span class="go">spam_virus/amavis.bats</span>
<span class="go"> ✓ [Amavis] SpamAssassin integration should be active [1165]</span>
<span class="go">spam_virus/clamav.bats</span>
<span class="go"> ✓ [ClamAV] log files exist at /var/log/mail directory [73]</span>
<span class="go"> ✓ [ClamAV] should be identified by Amavis [67]</span>
<span class="go"> ✓ [ClamAV] freshclam cron is enabled [76]</span>
<span class="go">...</span>
</code></pre></div>
<p>Even better, before opening a PR run the full test suite:</p>
<div class="highlight"><pre><span></span><code><span class="gp">$ </span>make<span class="w"> </span>clean<span class="w"> </span>tests
</code></pre></div>
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