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1;">Distribution strategies</span> </a> </li><li class="astro-vfcvrjst" style="--depth: 1;"> <a href="#multiple-browsers" class="astro-vfcvrjst" style="--depth: 1;"> <span class="astro-vfcvrjst" style="--depth: 1;">Multiple browsers</span> </a> </li><li class="astro-vfcvrjst" style="--depth: 1;"> <a href="#reading-worker-results" class="astro-vfcvrjst" style="--depth: 1;"> <span class="astro-vfcvrjst" style="--depth: 1;">Reading worker results</span> </a> </li> </ul> </li><li class="astro-vfcvrjst" style="--depth: 0;"> <a href="#sharding" class="astro-vfcvrjst" style="--depth: 0;"> <span class="astro-vfcvrjst" style="--depth: 0;">Sharding</span> </a> </li><li class="astro-vfcvrjst" style="--depth: 0;"> <a href="#custom-parallelization" class="astro-vfcvrjst" style="--depth: 0;"> <span class="astro-vfcvrjst" style="--depth: 0;">Custom parallelization</span> </a> </li><li class="astro-vfcvrjst" style="--depth: 0;"> <a href="#sharing-data-between-workers" class="astro-vfcvrjst" 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1;"> <li class="astro-vfcvrjst" style="--depth: 1;"> <a href="#distribution-strategies" class="astro-vfcvrjst" style="--depth: 1;"> <span class="astro-vfcvrjst" style="--depth: 1;">Distribution strategies</span> </a> </li><li class="astro-vfcvrjst" style="--depth: 1;"> <a href="#multiple-browsers" class="astro-vfcvrjst" style="--depth: 1;"> <span class="astro-vfcvrjst" style="--depth: 1;">Multiple browsers</span> </a> </li><li class="astro-vfcvrjst" style="--depth: 1;"> <a href="#reading-worker-results" class="astro-vfcvrjst" style="--depth: 1;"> <span class="astro-vfcvrjst" style="--depth: 1;">Reading worker results</span> </a> </li> </ul> </li><li class="astro-vfcvrjst" style="--depth: 0;"> <a href="#sharding" class="astro-vfcvrjst" style="--depth: 0;"> <span class="astro-vfcvrjst" style="--depth: 0;">Sharding</span> </a> </li><li class="astro-vfcvrjst" style="--depth: 0;"> <a href="#custom-parallelization" class="astro-vfcvrjst" style="--depth: 0;"> <span class="astro-vfcvrjst" style="--depth: 0;">Custom parallelization</span> </a> </li><li class="astro-vfcvrjst" style="--depth: 0;"> <a href="#sharing-data-between-workers" class="astro-vfcvrjst" style="--depth: 0;"> <span class="astro-vfcvrjst" style="--depth: 0;">Sharing data between workers</span> </a> </li> </ul> </nav></starlight-toc><script type="module" src="/_astro/TableOfContents.astro_astro_type_script_index_0_lang.CKWWgpjV.js"></script></div></div> </div> </aside> <div class="main-pane astro-4deqquyo"> <main data-pagefind-body class="astro-qj6ycuyd" lang="en" dir="ltr"> <div class="content-panel astro-7vmgf2si"> <div class="sl-container astro-7vmgf2si"> <div class="astro-guvttfii"></div><h1 id="_top" class="astro-bmayhthr">Parallel Execution</h1> </div> </div> <div class="content-panel astro-7vmgf2si"> <div class="sl-container astro-7vmgf2si"> <starlight-image-zoom> <template class="astro-qteoq5nn"> <dialog class="starlight-image-zoom-dialog astro-qteoq5nn"> <button aria-label="Unzoom image" 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<p>Two built-in ways to run tests in parallel:</p>
<ul>
<li><strong><code dir="auto">run-workers</code></strong> — split tests across worker threads on one runner.</li>
<li><strong><code dir="auto">--shard</code></strong> — split test files across CI machines in a matrix build.</li>
</ul>
<p>For anything more specific — your own grouping, a config per group, several browsers at once — drive the <code dir="auto">Workers</code> API from a script (see <a href="#custom-parallelization">Custom parallelization</a>).</p>
<div class="sl-heading-wrapper level-h2"><h2 id="workers">Workers</h2><a class="sl-anchor-link" href="#workers"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Workers”</span></a></div>
<p><code dir="auto">run-workers <N></code> spawns <code dir="auto">N</code> <a href="https://nodejs.org/api/worker_threads.html">worker threads</a>, each an independent CodeceptJS instance running a slice of the suite, and merges the results:</p>
<div class="expressive-code"><link rel="stylesheet" href="/_astro/ec.y86o5.css"><script type="module" src="/_astro/ec.p1z7b.js"></script><figure class="frame is-terminal not-content"><figcaption class="header"><span class="title"></span><span class="sr-only">Terminal window</span></figcaption><pre data-language="sh"><code><div class="ec-line"><div class="code"><span style="--1:#1F2937"><span style="--0:#E5E7EB">npx</span><span style="--0:#C9D1D9"> </span></span><span style="--0:#7DD3FC;--1:#0369A1">codeceptjs</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">run-workers</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#FBBF24;--1:#A94E08">4</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="npx codeceptjs run-workers 4"><div></div></button></div></figure></div>
<p>Steps are not streamed to the console in this mode — output from separate threads can’t be interleaved cleanly. While workers run, CodeceptJS sets <code dir="auto">process.env.RUNS_WITH_WORKERS=true</code>, so plugins and helpers can branch on it. All <code dir="auto">run</code> options work here too: <code dir="auto">--grep "@smoke"</code>, <code dir="auto">-c codecept.conf.js</code>, <code dir="auto">--debug</code>, and the rest.</p>
<div class="sl-heading-wrapper level-h3"><h3 id="distribution-strategies">Distribution strategies</h3><a class="sl-anchor-link" href="#distribution-strategies"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Distribution strategies”</span></a></div>
<p><code dir="auto">--by</code> controls how tests spread across workers:</p>
<table><thead><tr><th><code dir="auto">--by</code></th><th>How tests are assigned</th><th>Use when</th></tr></thead><tbody><tr><td><code dir="auto">test</code> (default)</td><td>each test pinned to a worker up front</td><td>tests take roughly equal time</td></tr><tr><td><code dir="auto">suite</code></td><td>each suite pinned to a worker; its tests stay together</td><td>suites share a <code dir="auto">BeforeSuite</code> you don’t want repeated</td></tr><tr><td><code dir="auto">pool</code></td><td>workers pull the next test from a shared queue as they free up</td><td>test durations vary — best load balancing</td></tr></tbody></table>
<div class="expressive-code"><figure class="frame is-terminal not-content"><figcaption class="header"><span class="title"></span><span class="sr-only">Terminal window</span></figcaption><pre data-language="sh"><code><div class="ec-line"><div class="code"><span style="--1:#1F2937"><span style="--0:#E5E7EB">npx</span><span style="--0:#C9D1D9"> </span></span><span style="--0:#7DD3FC;--1:#0369A1">codeceptjs</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">run-workers</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#FBBF24;--1:#A94E08">4</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">--by</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">pool</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="npx codeceptjs run-workers 4 --by pool"><div></div></button></div></figure></div>
<p><code dir="auto">--suites</code> is shorthand for <code dir="auto">--by suite</code>.</p>
<div class="sl-heading-wrapper level-h3"><h3 id="multiple-browsers">Multiple browsers</h3><a class="sl-anchor-link" href="#multiple-browsers"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Multiple browsers”</span></a></div>
<p>Define browser profiles under <code dir="auto">multiple</code> in <code dir="auto">codecept.conf.js</code>:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="js"><code><div class="ec-line"><div class="code"><span style="--0:#C9D1D9;--1:#1F2937">multiple</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#D8B4FE;--1:#7C3AED">default</span><span style="--0:#C9D1D9;--1:#1F2937">: </span><span style="--0:#9CA3AF;--1:#4B5563">{</span><span style="--0:#C9D1D9;--1:#1F2937"> browsers</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">[</span><span style="--0:#7DD3FC;--1:#0369A1">'chrome'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'firefox'</span><span style="--0:#9CA3AF;--1:#4B5563">]</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">},</span></div></div><div class="ec-line"><div class="code"><span style="--0:#9CA3AF;--1:#4B5563">}</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="multiple: { default: { browsers: ['chrome', 'firefox'] },}"><div></div></button></div></figure></div>
<p>Then run a profile across workers — by name, or <code dir="auto">all</code> for every profile:</p>
<div class="expressive-code"><figure class="frame is-terminal not-content"><figcaption class="header"><span class="title"></span><span class="sr-only">Terminal window</span></figcaption><pre data-language="sh"><code><div class="ec-line"><div class="code"><span style="--1:#1F2937"><span style="--0:#E5E7EB">npx</span><span style="--0:#C9D1D9"> </span></span><span style="--0:#7DD3FC;--1:#0369A1">codeceptjs</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">run-workers</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#FBBF24;--1:#A94E08">3</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">default</span></div></div><div class="ec-line"><div class="code"><span style="--1:#1F2937"><span style="--0:#E5E7EB">npx</span><span style="--0:#C9D1D9"> </span></span><span style="--0:#7DD3FC;--1:#0369A1">codeceptjs</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">run-workers</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#FBBF24;--1:#A94E08">3</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">all</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="npx codeceptjs run-workers 3 defaultnpx codeceptjs run-workers 3 all"><div></div></button></div></figure></div>
<p>(<code dir="auto">run-multiple</code> runs the same profiles in separate subprocesses instead of threads — see <code dir="auto">npx codeceptjs run-multiple --help</code>.)</p>
<div class="sl-heading-wrapper level-h3"><h3 id="reading-worker-results">Reading worker results</h3><a class="sl-anchor-link" href="#reading-worker-results"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Reading worker results”</span></a></div>
<p>When all workers finish, the run fires <code dir="auto">event.workers.result</code> with the merged result:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="js"><code><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">import</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span><span style="--0:#C9D1D9;--1:#1F2937"> event </span><span style="--0:#9CA3AF;--1:#4B5563">}</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">from</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'codeceptjs'</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">export</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">default</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">function</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">()</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#C9D1D9;--1:#1F2937"> </span></span><span style="--0:#C9D1D9;--1:#1F2937">event</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">dispatcher</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">on</span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#C9D1D9;--1:#1F2937">event</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">result</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> result </span><span style="--0:#D8B4FE;--1:#7C3AED">=></span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#C9D1D9;--1:#1F2937"> </span></span><span style="--0:#C9D1D9;--1:#1F2937">console</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">log</span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#C9D1D9;--1:#1F2937">result</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">hasFailed</span><span style="--0:#9CA3AF;--1:#4B5563">()</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">?</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'FAILED'</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'PASSED'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> result</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">stats</span><span style="--0:#9CA3AF;--1:#4B5563">)</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#D8B4FE;--1:#7C3AED">for</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#D8B4FE;--1:#7C3AED">const</span><span style="--0:#C9D1D9;--1:#1F2937"> test </span><span style="--0:#D8B4FE;--1:#7C3AED">of</span><span style="--0:#C9D1D9;--1:#1F2937"> result</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">tests</span><span style="--0:#9CA3AF;--1:#4B5563">)</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#C9D1D9;--1:#1F2937"> </span></span><span style="--0:#C9D1D9;--1:#1F2937">console</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">log</span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#C9D1D9;--1:#1F2937">test</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">title</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> test</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">duration</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'ms'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">`worker </span><span style="--0:#9CA3AF;--1:#4B5563">${</span><span style="--0:#7DD3FC;--1:#0369A1">test</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">workerIndex</span><span style="--0:#9CA3AF;--1:#4B5563">}</span><span style="--0:#7DD3FC;--1:#0369A1">`</span><span style="--0:#9CA3AF;--1:#4B5563">)</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#9CA3AF;--1:#4B5563">}</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#9CA3AF;--1:#4B5563">})</span></div></div><div class="ec-line"><div class="code"><span style="--0:#9CA3AF;--1:#4B5563">}</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="import { event } from 'codeceptjs'export default function () { event.dispatcher.on(event.workers.result, result => { console.log(result.hasFailed() ? 'FAILED' : 'PASSED', result.stats) for (const test of result.tests) { console.log(test.title, test.duration, 'ms', `worker ${test.workerIndex}`) } })}"><div></div></button></div></figure></div>
<p>For end-of-run work like publishing to a test-management tool, listen on <code dir="auto">event.workers.result</code> (fires once) rather than <code dir="auto">event.all.result</code> (fires in every worker).</p>
<div class="sl-heading-wrapper level-h2"><h2 id="sharding">Sharding</h2><a class="sl-anchor-link" href="#sharding"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Sharding”</span></a></div>
<p><code dir="auto">--shard <index>/<total></code> runs only a slice of your <strong>test files</strong>: the file list is cut into <code dir="auto">total</code> even chunks and this run executes chunk <code dir="auto">index</code>. It is built for CI matrices — one machine per shard, each running <code dir="auto">run</code>:</p>
<div class="expressive-code"><figure class="frame is-terminal not-content"><figcaption class="header"><span class="title"></span><span class="sr-only">Terminal window</span></figcaption><pre data-language="sh"><code><div class="ec-line"><div class="code"><span style="--1:#1F2937"><span style="--0:#E5E7EB">npx</span><span style="--0:#C9D1D9"> </span></span><span style="--0:#7DD3FC;--1:#0369A1">codeceptjs</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">run</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">--shard</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">1/4</span></div></div><div class="ec-line"><div class="code"><span style="--1:#1F2937"><span style="--0:#E5E7EB">npx</span><span style="--0:#C9D1D9"> </span></span><span style="--0:#7DD3FC;--1:#0369A1">codeceptjs</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">run</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">--shard</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">2/4</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="npx codeceptjs run --shard 1/4npx codeceptjs run --shard 2/4"><div></div></button></div></figure></div>
<p>GitHub Actions:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="yaml"><code><div class="ec-line"><div class="code"><span style="--0:#7DD3FC;--1:#0369A1">jobs</span><span style="--0:#9CA3AF;--1:#4B5563">:</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#7DD3FC;--1:#0369A1">test</span><span style="--0:#9CA3AF;--1:#4B5563">:</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#7DD3FC;--1:#0369A1">runs-on</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">ubuntu-latest</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#7DD3FC;--1:#0369A1">strategy</span><span style="--0:#9CA3AF;--1:#4B5563">:</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#7DD3FC;--1:#0369A1">matrix</span><span style="--0:#9CA3AF;--1:#4B5563">:</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#7DD3FC;--1:#0369A1">shard</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">[</span><span style="--0:#7DD3FC;--1:#0369A1">'1/4'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'2/4'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'3/4'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'4/4'</span><span style="--0:#9CA3AF;--1:#4B5563">]</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#7DD3FC;--1:#0369A1">steps</span><span style="--0:#9CA3AF;--1:#4B5563">:</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#9CA3AF;--1:#4B5563">-</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">uses</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">actions/checkout@v4</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#9CA3AF;--1:#4B5563">-</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">uses</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">actions/setup-node@v4</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#7DD3FC;--1:#0369A1">with</span><span style="--0:#9CA3AF;--1:#4B5563">:</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#7DD3FC;--1:#0369A1">node-version</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#FBBF24;--1:#A94E08">20</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#9CA3AF;--1:#4B5563">-</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">run</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">npm ci</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#9CA3AF;--1:#4B5563">-</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">run</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">npx codeceptjs run --shard ${{ matrix.shard }}</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="jobs: test: runs-on: ubuntu-latest strategy: matrix: shard: ['1/4', '2/4', '3/4', '4/4'] steps: - uses: actions/checkout@v4 - uses: actions/setup-node@v4 with: node-version: 20 - run: npm ci - run: npx codeceptjs run --shard ${{ matrix.shard }}"><div></div></button></div></figure></div>
<p>Add or remove tests freely — shards rebalance automatically.</p>
<div class="sl-heading-wrapper level-h2"><h2 id="custom-parallelization">Custom parallelization</h2><a class="sl-anchor-link" href="#custom-parallelization"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Custom parallelization”</span></a></div>
<p>When the built-in commands aren’t enough, build a runner with the <code dir="auto">Workers</code> API: decide which tests go to which group, give each group its own config, and listen for results.</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="js"><code><div class="ec-line"><div class="code"><span style="--0:#8B949E;--0fs:italic;--1:#636976;--1fs:italic">#!/usr/bin/env node</span></div></div><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">import</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span><span style="--0:#C9D1D9;--1:#1F2937"> Workers</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> event </span><span style="--0:#9CA3AF;--1:#4B5563">}</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">from</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'codeceptjs'</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">const</span><span style="--0:#C9D1D9;--1:#1F2937"> workers </span><span style="--0:#9CA3AF;--1:#4B5563">=</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">new</span><span style="--1:#1F2937"><span style="--0:#C9D1D9"> </span><span style="--0:#E5E7EB">Workers</span></span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#D8B4FE;--1:#7C3AED">null</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span><span style="--0:#C9D1D9;--1:#1F2937"> testConfig</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'./codecept.conf.js'</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">})</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#8B949E;--0fs:italic;--1:#636976;--1fs:italic">// split the suite into 2 groups, run each group on two browsers</span></div></div><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">const</span><span style="--0:#C9D1D9;--1:#1F2937"> groups </span><span style="--0:#9CA3AF;--1:#4B5563">=</span><span style="--0:#C9D1D9;--1:#1F2937"> workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">createGroupsOfSuites</span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#FBBF24;--1:#A94E08">2</span><span style="--0:#9CA3AF;--1:#4B5563">)</span></div></div><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">for</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#D8B4FE;--1:#7C3AED">const</span><span style="--0:#C9D1D9;--1:#1F2937"> browser </span><span style="--0:#D8B4FE;--1:#7C3AED">of</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">[</span><span style="--0:#7DD3FC;--1:#0369A1">'chromium'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'firefox'</span><span style="--0:#9CA3AF;--1:#4B5563">])</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#D8B4FE;--1:#7C3AED">for</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#D8B4FE;--1:#7C3AED">const</span><span style="--0:#C9D1D9;--1:#1F2937"> group </span><span style="--0:#D8B4FE;--1:#7C3AED">of</span><span style="--0:#C9D1D9;--1:#1F2937"> groups</span><span style="--0:#9CA3AF;--1:#4B5563">)</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#D8B4FE;--1:#7C3AED">const</span><span style="--0:#C9D1D9;--1:#1F2937"> worker </span><span style="--0:#9CA3AF;--1:#4B5563">=</span><span style="--0:#C9D1D9;--1:#1F2937"> workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">spawn</span><span style="--0:#9CA3AF;--1:#4B5563">()</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#C9D1D9;--1:#1F2937"> </span></span><span style="--0:#C9D1D9;--1:#1F2937">worker</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">addTests</span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#C9D1D9;--1:#1F2937">group</span><span style="--0:#9CA3AF;--1:#4B5563">)</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--0:#C9D1D9;--1:#1F2937"> </span></span><span style="--0:#C9D1D9;--1:#1F2937">worker</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">addConfig</span><span style="--0:#9CA3AF;--1:#4B5563">({</span><span style="--0:#C9D1D9;--1:#1F2937"> helpers</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span><span style="--0:#C9D1D9;--1:#1F2937"> Playwright</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span><span style="--0:#C9D1D9;--1:#1F2937"> browser </span><span style="--0:#9CA3AF;--1:#4B5563">}</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">}</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">})</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#9CA3AF;--1:#4B5563">}</span></div></div><div class="ec-line"><div class="code"><span style="--0:#9CA3AF;--1:#4B5563">}</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#C9D1D9;--1:#1F2937">workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">on</span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#C9D1D9;--1:#1F2937">event</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">test</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">failed</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> t </span><span style="--0:#D8B4FE;--1:#7C3AED">=></span><span style="--0:#C9D1D9;--1:#1F2937"> console</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">log</span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#7DD3FC;--1:#0369A1">'FAIL'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> t</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">title</span><span style="--0:#9CA3AF;--1:#4B5563">))</span></div></div><div class="ec-line"><div class="code"><span style="--0:#C9D1D9;--1:#1F2937">workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">on</span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#C9D1D9;--1:#1F2937">event</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">all</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">result</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">()</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">=></span><span style="--0:#C9D1D9;--1:#1F2937"> workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">printResults</span><span style="--0:#9CA3AF;--1:#4B5563">())</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">await</span><span style="--0:#C9D1D9;--1:#1F2937"> workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">bootstrapAll</span><span style="--0:#9CA3AF;--1:#4B5563">()</span></div></div><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">try</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#D8B4FE;--1:#7C3AED">await</span><span style="--0:#C9D1D9;--1:#1F2937"> workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">run</span><span style="--0:#9CA3AF;--1:#4B5563">()</span></div></div><div class="ec-line"><div class="code"><span style="--0:#9CA3AF;--1:#4B5563">}</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">finally</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#D8B4FE;--1:#7C3AED">await</span><span style="--0:#C9D1D9;--1:#1F2937"> workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">teardownAll</span><span style="--0:#9CA3AF;--1:#4B5563">()</span></div></div><div class="ec-line"><div class="code"><span style="--0:#9CA3AF;--1:#4B5563">}</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="#!/usr/bin/env nodeimport { Workers, event } from 'codeceptjs'const workers = new Workers(null, { testConfig: './codecept.conf.js' })// split the suite into 2 groups, run each group on two browsersconst groups = workers.createGroupsOfSuites(2)for (const browser of ['chromium', 'firefox']) { for (const group of groups) { const worker = workers.spawn() worker.addTests(group) worker.addConfig({ helpers: { Playwright: { browser } } }) }}workers.on(event.test.failed, t => console.log('FAIL', t.title))workers.on(event.all.result, () => workers.printResults())await workers.bootstrapAll()try { await workers.run()} finally { await workers.teardownAll()}"><div></div></button></div></figure></div>
<p>Building blocks:</p>
<ul>
<li><code dir="auto">new Workers(N, { testConfig, options })</code> — <code dir="auto">N</code> workers; pass <code dir="auto">null</code> to spawn them yourself with <code dir="auto">spawn()</code>.</li>
<li><code dir="auto">createGroupsOfTests(n)</code> / <code dir="auto">createGroupsOfSuites(n)</code> — split the suite into <code dir="auto">n</code> groups.</li>
<li><code dir="auto">worker.addTests(group)</code> / <code dir="auto">worker.addConfig(partialConfig)</code> — assign tests and config overrides to a spawned worker.</li>
<li><code dir="auto">bootstrapAll()</code> → <code dir="auto">run()</code> → <code dir="auto">teardownAll()</code> — lifecycle (wrap <code dir="auto">run()</code> in <code dir="auto">try/finally</code> so teardown always runs).</li>
<li>Events on the <code dir="auto">workers</code> object: <code dir="auto">event.test.passed</code>, <code dir="auto">event.test.failed</code>, <code dir="auto">event.all.result</code>, plus <code dir="auto">'message'</code> for anything a child worker sends. <code dir="auto">printResults()</code> prints the standard summary; <code dir="auto">result.hasFailed()</code> and <code dir="auto">result.stats</code> give the totals.</li>
</ul>
<p>To split by your own rule, pass a function as <code dir="auto">by</code> — it receives the worker count and returns an array of file groups:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="js"><code><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">const</span><span style="--1:#1F2937"><span style="--0:#C9D1D9"> </span><span style="--0:#E5E7EB">splitTests</span><span style="--0:#C9D1D9"> </span></span><span style="--0:#9CA3AF;--1:#4B5563">=</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">()</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">=></span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">[</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#9CA3AF;--1:#4B5563">[</span><span style="--0:#7DD3FC;--1:#0369A1">'./test/login_test.js'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'./test/signup_test.js'</span><span style="--0:#9CA3AF;--1:#4B5563">],</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#8B949E;--0fs:italic;--1:#636976;--1fs:italic">// group 1</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#9CA3AF;--1:#4B5563">[</span><span style="--0:#7DD3FC;--1:#0369A1">'./test/slow_checkout_test.js'</span><span style="--0:#9CA3AF;--1:#4B5563">],</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#8B949E;--0fs:italic;--1:#636976;--1fs:italic">// group 2</span></div></div><div class="ec-line"><div class="code"><span style="--0:#9CA3AF;--1:#4B5563">]</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">const</span><span style="--0:#C9D1D9;--1:#1F2937"> workers </span><span style="--0:#9CA3AF;--1:#4B5563">=</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">new</span><span style="--1:#1F2937"><span style="--0:#C9D1D9"> </span><span style="--0:#E5E7EB">Workers</span></span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#FBBF24;--1:#A94E08">2</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span><span style="--0:#C9D1D9;--1:#1F2937"> testConfig</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'./codecept.conf.js'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> by</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> splitTests </span><span style="--0:#9CA3AF;--1:#4B5563">})</span></div></div><div class="ec-line"><div class="code"><span style="--0:#C9D1D9;--1:#1F2937">workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">on</span><span style="--0:#9CA3AF;--1:#4B5563">(</span><span style="--0:#C9D1D9;--1:#1F2937">event</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">all</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#C9D1D9;--1:#1F2937">result</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">()</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">=></span><span style="--0:#C9D1D9;--1:#1F2937"> workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">printResults</span><span style="--0:#9CA3AF;--1:#4B5563">())</span></div></div><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">await</span><span style="--0:#C9D1D9;--1:#1F2937"> workers</span><span style="--0:#9CA3AF;--1:#4B5563">.</span><span style="--0:#E5E7EB;--1:#1F2937">run</span><span style="--0:#9CA3AF;--1:#4B5563">()</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="const splitTests = () => [ ['./test/login_test.js', './test/signup_test.js'], // group 1 ['./test/slow_checkout_test.js'], // group 2]const workers = new Workers(2, { testConfig: './codecept.conf.js', by: splitTests })workers.on(event.all.result, () => workers.printResults())await workers.run()"><div></div></button></div></figure></div>
<div class="sl-heading-wrapper level-h2"><h2 id="sharing-data-between-workers">Sharing data between workers</h2><a class="sl-anchor-link" href="#sharing-data-between-workers"><span aria-hidden="true" class="sl-anchor-icon"><svg width="16" height="16" viewBox="0 0 24 24"><path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z"></path></svg></span><span class="sr-only">Section titled “Sharing data between workers”</span></a></div>
<p>Worker threads don’t share memory. <code dir="auto">share()</code> publishes a value that any worker reads with <code dir="auto">inject()</code>:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="js"><code><div class="ec-line"><div class="code"><span style="--0:#8B949E;--0fs:italic;--1:#636976;--1fs:italic">// in any test or hook</span></div></div><div class="ec-line"><div class="code"><span style="--0:#E5E7EB;--1:#1F2937">share</span><span style="--0:#9CA3AF;--1:#4B5563">({</span><span style="--0:#C9D1D9;--1:#1F2937"> user</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span><span style="--0:#C9D1D9;--1:#1F2937"> name</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'jane'</span><span style="--0:#9CA3AF;--1:#4B5563">,</span><span style="--0:#C9D1D9;--1:#1F2937"> password</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'s3cret'</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">}</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">})</span></div></div><div class="ec-line"><div class="code">
</div></div><div class="ec-line"><div class="code"><span style="--0:#8B949E;--0fs:italic;--1:#636976;--1fs:italic">// anywhere else, even in another worker</span></div></div><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">const</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span><span style="--0:#C9D1D9;--1:#1F2937"> user </span><span style="--0:#9CA3AF;--1:#4B5563">}</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">=</span><span style="--1:#1F2937"><span style="--0:#C9D1D9"> </span><span style="--0:#E5E7EB">inject</span></span><span style="--0:#9CA3AF;--1:#4B5563">()</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="// in any test or hookshare({ user: { name: 'jane', password: 's3cret' } })// anywhere else, even in another workerconst { user } = inject()"><div></div></button></div></figure></div>
<p>Seed shared state before tests run from <code dir="auto">bootstrap()</code>:</p>
<div class="expressive-code"><figure class="frame has-title not-content"><figcaption class="header"><span class="title">codecept.conf.js</span></figcaption><pre data-language="js"><code><div class="ec-line"><div class="code"><span style="--0:#D8B4FE;--1:#7C3AED">export</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">const</span><span style="--0:#C9D1D9;--1:#1F2937"> config </span><span style="--0:#9CA3AF;--1:#4B5563">=</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--1:#1F2937"> </span></span><span style="--0:#E5E7EB;--1:#1F2937">bootstrap</span><span style="--0:#9CA3AF;--1:#4B5563">()</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span></div></div><div class="ec-line"><div class="code"><span class="indent"><span style="--1:#1F2937"> </span></span><span style="--0:#E5E7EB;--1:#1F2937">share</span><span style="--0:#9CA3AF;--1:#4B5563">({</span><span style="--0:#C9D1D9;--1:#1F2937"> user</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">null</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">})</span></div></div><div class="ec-line"><div class="code"><span class="indent"> </span><span style="--0:#9CA3AF;--1:#4B5563">},</span></div></div><div class="ec-line"><div class="code"><span style="--0:#9CA3AF;--1:#4B5563">}</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="export const config = { bootstrap() { share({ user: null }) },}"><div></div></button></div></figure></div>
<p>Shared data is a Proxy. Don’t reassign the injected object itself (<code dir="auto">let d = inject(); d = {…}</code> breaks the link); mutate it or call <code dir="auto">share()</code> again. Pass <code dir="auto">{ local: true }</code> to keep a value inside one worker:</p>
<div class="expressive-code"><figure class="frame not-content"><figcaption class="header"></figcaption><pre data-language="js"><code><div class="ec-line"><div class="code"><span style="--0:#E5E7EB;--1:#1F2937">share</span><span style="--0:#9CA3AF;--1:#4B5563">({</span><span style="--0:#C9D1D9;--1:#1F2937"> tmpFile</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#7DD3FC;--1:#0369A1">'/tmp/run-1'</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">},</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">{</span><span style="--0:#C9D1D9;--1:#1F2937"> local</span><span style="--0:#9CA3AF;--1:#4B5563">:</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#D8B4FE;--1:#7C3AED">true</span><span style="--0:#C9D1D9;--1:#1F2937"> </span><span style="--0:#9CA3AF;--1:#4B5563">})</span></div></div></code></pre><div class="copy"><button title="Copy to clipboard" data-copied="Copied!" data-code="share({ tmpFile: '/tmp/run-1' }, { local: true })"><div></div></button></div></figure></div> </div> <footer class="sl-flex astro-4qzcips2"> <div class="meta sl-flex astro-4qzcips2"> </div> <div class="pagination-links print:hidden astro-c6pzuqbq" dir="ltr"> <a href="/hooks" rel="prev" class="astro-c6pzuqbq"> <svg aria-hidden="true" class="astro-c6pzuqbq astro-cbi3kmoi" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.5rem;"><path d="M17 11H9.41l3.3-3.29a1.004 1.004 0 1 0-1.42-1.42l-5 5a1 1 0 0 0-.21.33 1 1 0 0 0 0 .76 1 1 0 0 0 .21.33l5 5a1.002 1.002 0 0 0 1.639-.325 1 1 0 0 0-.219-1.095L9.41 13H17a1 1 0 0 0 0-2Z"/></svg> <span class="astro-c6pzuqbq"> Previous <br class="astro-c6pzuqbq"> <span class="link-title astro-c6pzuqbq">Extending</span> </span> </a> <a href="/reports" rel="next" class="astro-c6pzuqbq"> <svg aria-hidden="true" class="astro-c6pzuqbq astro-cbi3kmoi" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.5rem;"><path d="M17.92 11.62a1.001 1.001 0 0 0-.21-.33l-5-5a1.003 1.003 0 1 0-1.42 1.42l3.3 3.29H7a1 1 0 0 0 0 2h7.59l-3.3 3.29a1.002 1.002 0 0 0 .325 1.639 1 1 0 0 0 1.095-.219l5-5a1 1 0 0 0 .21-.33 1 1 0 0 0 0-.76Z"/></svg> <span class="astro-c6pzuqbq"> Next <br class="astro-c6pzuqbq"> <span class="link-title astro-c6pzuqbq">Reporting</span> </span> </a> </div> </footer> </div> </div> </main> </div> </div> </div> <footer class="cc-footer !mt-0 py-16 relative overflow-hidden"> <div class="cc-footer-grain" aria-hidden="true"></div> <div class="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 relative"> <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-5 gap-8 mb-12"> <div class="lg:col-span-1"> <a href="/" class="inline-flex items-center mb-6" aria-label="CodeceptJS home"> <img src="/logo/logo-violet-dark.svg" alt="CodeceptJS" width="205" height="40" class="h-10 w-auto"> </a> <p class="cc-footer-body leading-relaxed mb-6">
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