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Examples
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Videos
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Trainings
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<span data-v-34dbfd23><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></li></ul></li></ul></div></div> <!----></nav> <ul class="sidebar-links"><li><div class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Web Testing</span> <span class="arrow"></span></p> <!----></div></li><li><div class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Mobile Testing</span> <span class="arrow"></span></p> <!----></div></li><li><div class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Organizing Tests</span> <span class="arrow"></span></p> <!----></div></li><li><div class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Advanced Usage</span> <span class="arrow open"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/advanced/" class="sidebar-link">Advanced Usage</a></li><li><a href="/bootstrap/" class="sidebar-link">Bootstrap</a></li><li><a href="/reports/" class="sidebar-link">Reporters</a></li><li><a href="/continuous-integration/" class="sidebar-link">Continuous Integration</a></li><li><a href="/parallel/" aria-current="page" class="active sidebar-link">Parallel Execution</a><ul class="sidebar-sub-headers" data-v-a68ca4e6><li class="sidebar-sub-header" data-v-a68ca4e6><a href="/parallel/#parallel-execution-by-workers" class="sidebar-link">Parallel Execution by Workers</a></li><li class="sidebar-sub-header" data-v-a68ca4e6><a href="/parallel/#test-stats-with-parallel-execution-by-workers" class="sidebar-link">Test stats with Parallel Execution by Workers</a></li><li class="sidebar-sub-header" data-v-a68ca4e6><a href="/parallel/#parallel-execution-by-workers-on-multiple-browsers" class="sidebar-link">Parallel Execution by Workers on Multiple Browsers</a></li><li class="sidebar-sub-header" data-v-a68ca4e6><a href="/parallel/#custom-parallel-execution" class="sidebar-link">Custom Parallel Execution</a></li><li class="sidebar-sub-header" data-v-a68ca4e6><a href="/parallel/#sharing-data-between-workers" class="sidebar-link">Sharing Data Between Workers</a></li></ul></li><li><a href="/visual/" class="sidebar-link">Visual Testing</a></li><li><a href="/email/" class="sidebar-link">Email Testing</a></li><li><a href="/secrets.html" class="sidebar-link">Secrets</a></li><li><a href="/hooks/" class="sidebar-link">Extending CodeceptJS</a></li><li><a href="/internal-api/" class="sidebar-link">Internal API</a></li><li><a href="/react/" class="sidebar-link">Testing React Applications</a></li><li><a href="/ai/" class="sidebar-link">Testing with AI 🪄</a></li><li><a href="/heal.html" class="sidebar-link">Self-Healing Tests</a></li></ul></div></li></ul> </aside> <main class="page"><div class="article-title">Parallel Execution</div> <div class="post"><article><div class="theme-default-content content__default"><h1 id="parallel-execution"><a href="#parallel-execution" class="header-anchor">#</a> Parallel Execution</h1> <p>CodeceptJS has two engines for running tests in parallel:</p> <ul><li><code>run-workers</code> - which spawns <a href="https://nodejs.org/api/worker_threads.html" target="_blank" rel="noopener noreferrer">NodeJS Worker<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> in a thread. Tests are split by scenarios, scenarios are mixed between groups, each worker runs tests from its own group.</li> <li><code>run-multiple</code> - which spawns a subprocess with CodeceptJS. Tests are split by files and configured in <code>codecept.conf.js</code>.</li></ul> <p>Workers are faster and simpler to start, while <code>run-multiple</code> requires additional configuration and can be used to run tests in different browsers at once.</p> <h2 id="parallel-execution-by-workers"><a href="#parallel-execution-by-workers" class="header-anchor">#</a> Parallel Execution by Workers</h2> <p>It is easy to run tests in parallel if you have a lots of tests and free CPU cores. Just execute your tests using <code>run-workers</code> command specifying the number of workers to spawn:</p> <div class="language- extra-class"><pre class="language-text"><code>npx codeceptjs run-workers 2
</code></pre></div><blockquote><p>ℹ Workers require NodeJS >= 11.7</p></blockquote> <p>This command is similar to <code>run</code>, however, steps output can't be shown in workers mode, as it is impossible to synchronize steps output from different processes.</p> <p>Each worker spins an instance of CodeceptJS, executes a group of tests, and sends back report to the main process.</p> <p>By default, the tests are assigned one by one to the available workers this may lead to multiple execution of <code>BeforeSuite()</code>. Use the option <code>--suites</code> to assign the suites one by one to the workers.</p> <div class="language-sh extra-class"><pre class="language-sh"><code>npx codeceptjs run-workers <span class="token parameter variable">--suites</span> <span class="token number">2</span>
</code></pre></div><h2 id="test-stats-with-parallel-execution-by-workers"><a href="#test-stats-with-parallel-execution-by-workers" class="header-anchor">#</a> Test stats with Parallel Execution by Workers</h2> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> <span class="token punctuation">{</span> event <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'codeceptjs'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
module<span class="token punctuation">.</span><span class="token function-variable function">exports</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
event<span class="token punctuation">.</span>dispatcher<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>workers<span class="token punctuation">.</span>result<span class="token punctuation">,</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter">result</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>result<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">// in console log</span>
<span class="token constant">FAIL</span> <span class="token operator">|</span> <span class="token number">7</span> passed<span class="token punctuation">,</span> <span class="token number">1</span> failed<span class="token punctuation">,</span> <span class="token number">1</span> skipped <span class="token comment">// 2s</span>
<span class="token punctuation">{</span>
<span class="token string-property property">"tests"</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token string-property property">"passed"</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
<span class="token string-property property">"type"</span><span class="token operator">:</span> <span class="token string">"test"</span><span class="token punctuation">,</span>
<span class="token string-property property">"title"</span><span class="token operator">:</span> <span class="token string">"Assert @C3"</span><span class="token punctuation">,</span>
<span class="token string-property property">"body"</span><span class="token operator">:</span> <span class="token string">"() => { }"</span><span class="token punctuation">,</span>
<span class="token string-property property">"async"</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token string-property property">"sync"</span><span class="token operator">:</span> <span class="token boolean">true</span><span class="token punctuation">,</span>
<span class="token string-property property">"_timeout"</span><span class="token operator">:</span> <span class="token number">2000</span><span class="token punctuation">,</span>
<span class="token string-property property">"_slow"</span><span class="token operator">:</span> <span class="token number">75</span><span class="token punctuation">,</span>
<span class="token string-property property">"_retries"</span><span class="token operator">:</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">,</span>
<span class="token string-property property">"timedOut"</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token string-property property">"_currentRetry"</span><span class="token operator">:</span> <span class="token number">0</span><span class="token punctuation">,</span>
<span class="token string-property property">"pending"</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token string-property property">"opts"</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token string-property property">"tags"</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token string">"@C3"</span>
<span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"uid"</span><span class="token operator">:</span> <span class="token string">"xe4q1HdqpRrZG5dPe0JG+A"</span><span class="token punctuation">,</span>
<span class="token string-property property">"workerIndex"</span><span class="token operator">:</span> <span class="token number">3</span><span class="token punctuation">,</span>
<span class="token string-property property">"retries"</span><span class="token operator">:</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">,</span>
<span class="token string-property property">"duration"</span><span class="token operator">:</span> <span class="token number">493</span><span class="token punctuation">,</span>
<span class="token string-property property">"err"</span><span class="token operator">:</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
<span class="token string-property property">"parent"</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token string-property property">"title"</span><span class="token operator">:</span> <span class="token string">"My"</span><span class="token punctuation">,</span>
<span class="token string-property property">"ctx"</span><span class="token operator">:</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token string-property property">"suites"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"tests"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"root"</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token string-property property">"pending"</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token string-property property">"_retries"</span><span class="token operator">:</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">,</span>
<span class="token string-property property">"_beforeEach"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"_beforeAll"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"_afterEach"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"_afterAll"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"_timeout"</span><span class="token operator">:</span> <span class="token number">2000</span><span class="token punctuation">,</span>
<span class="token string-property property">"_slow"</span><span class="token operator">:</span> <span class="token number">75</span><span class="token punctuation">,</span>
<span class="token string-property property">"_bail"</span><span class="token operator">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
<span class="token string-property property">"_onlyTests"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"_onlySuites"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"delayed"</span><span class="token operator">:</span> <span class="token boolean">false</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token string-property property">"steps"</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token punctuation">{</span>
<span class="token string-property property">"actor"</span><span class="token operator">:</span> <span class="token string">"I"</span><span class="token punctuation">,</span>
<span class="token string-property property">"name"</span><span class="token operator">:</span> <span class="token string">"amOnPage"</span><span class="token punctuation">,</span>
<span class="token string-property property">"status"</span><span class="token operator">:</span> <span class="token string">"success"</span><span class="token punctuation">,</span>
<span class="token string-property property">"args"</span><span class="token operator">:</span> <span class="token punctuation">[</span>
<span class="token string">"https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST"</span>
<span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"startedAt"</span><span class="token operator">:</span> <span class="token number">1698760652610</span><span class="token punctuation">,</span>
<span class="token string-property property">"startTime"</span><span class="token operator">:</span> <span class="token number">1698760652611</span><span class="token punctuation">,</span>
<span class="token string-property property">"endTime"</span><span class="token operator">:</span> <span class="token number">1698760653098</span><span class="token punctuation">,</span>
<span class="token string-property property">"finishedAt"</span><span class="token operator">:</span> <span class="token number">1698760653098</span><span class="token punctuation">,</span>
<span class="token string-property property">"duration"</span><span class="token operator">:</span> <span class="token number">488</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span>
<span class="token punctuation">{</span>
<span class="token string-property property">"actor"</span><span class="token operator">:</span> <span class="token string">"I"</span><span class="token punctuation">,</span>
<span class="token string-property property">"name"</span><span class="token operator">:</span> <span class="token string">"grabCurrentUrl"</span><span class="token punctuation">,</span>
<span class="token string-property property">"status"</span><span class="token operator">:</span> <span class="token string">"success"</span><span class="token punctuation">,</span>
<span class="token string-property property">"args"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"startedAt"</span><span class="token operator">:</span> <span class="token number">1698760653098</span><span class="token punctuation">,</span>
<span class="token string-property property">"startTime"</span><span class="token operator">:</span> <span class="token number">1698760653098</span><span class="token punctuation">,</span>
<span class="token string-property property">"endTime"</span><span class="token operator">:</span> <span class="token number">1698760653099</span><span class="token punctuation">,</span>
<span class="token string-property property">"finishedAt"</span><span class="token operator">:</span> <span class="token number">1698760653099</span><span class="token punctuation">,</span>
<span class="token string-property property">"duration"</span><span class="token operator">:</span> <span class="token number">1</span>
<span class="token punctuation">}</span>
<span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"failed"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token string-property property">"skipped"</span><span class="token operator">:</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><p>CodeceptJS also exposes the env var <code>process.env.RUNS_WITH_WORKERS</code> when running tests with <code>run-workers</code> command so that you could handle the events better in your plugins/helpers</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> <span class="token punctuation">{</span> event <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'codeceptjs'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
module<span class="token punctuation">.</span><span class="token function-variable function">exports</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// this event would trigger the `_publishResultsToTestrail` when running `run-workers` command</span>
event<span class="token punctuation">.</span>dispatcher<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>workers<span class="token punctuation">.</span>result<span class="token punctuation">,</span> <span class="token keyword">async</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">await</span> <span class="token function">_publishResultsToTestrail</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// this event would not trigger the `_publishResultsToTestrail` multiple times when running `run-workers` command</span>
event<span class="token punctuation">.</span>dispatcher<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>all<span class="token punctuation">.</span>result<span class="token punctuation">,</span> <span class="token keyword">async</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token comment">// when running `run` command, this env var is undefined</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>process<span class="token punctuation">.</span>env<span class="token punctuation">.</span><span class="token constant">RUNS_WITH_WORKERS</span><span class="token punctuation">)</span> <span class="token keyword">await</span> <span class="token function">_publishResultsToTestrail</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><h2 id="parallel-execution-by-workers-on-multiple-browsers"><a href="#parallel-execution-by-workers-on-multiple-browsers" class="header-anchor">#</a> Parallel Execution by Workers on Multiple Browsers</h2> <p>To run tests in parallel across multiple browsers, modify your <code>codecept.conf.js</code> file to configure multiple browsers on which you want to run your tests and your tests will run across multiple browsers.</p> <p>Start with modifying the <code>codecept.conf.js</code> file. Add multiple key inside the config which will be used to configure multiple profiles.</p> <div class="language- extra-class"><pre class="language-text"><code>exports.config = {
helpers: {
WebDriver: {
url: 'http://localhost:3000',
desiredCapabilties: {}
}
},
multiple: {
profile1: {
browsers: [
{
browser: "firefox",
desiredCapabilties: {
// override capabilties related to firefox
}
},
{
browser: "chrome",
desiredCapabilties: {
// override capabilties related to chrome
}
}
]
},
profile2: {
browsers: [
{
browser: "safari",
desiredCapabilties: {
// override capabilties related to safari
}
}
]
}
}
};
</code></pre></div><p>To trigger tests on all the profiles configured, you can use the following command:</p> <div class="language- extra-class"><pre class="language-text"><code>npx codeceptjs run-workers 3 all -c codecept.conf.js
</code></pre></div><p>This will run your tests across all browsers configured from profile1 & profile2 on 3 workers.</p> <p>To trigger tests on specific profile, you can use the following command:</p> <div class="language- extra-class"><pre class="language-text"><code>npx codeceptjs run-workers 2 profile1 -c codecept.conf.js
</code></pre></div><p>This will run your tests across 2 browsers from profile1 on 2 workers.</p> <h2 id="custom-parallel-execution"><a href="#custom-parallel-execution" class="header-anchor">#</a> Custom Parallel Execution</h2> <p>To get a full control of parallelization create a custom execution script to match your needs.
This way you can configure which tests are matched, how the groups are formed, and with which configuration each worker is executed.</p> <p>Start with creating file <code>bin/parallel.js</code>.</p> <p>On MacOS/Linux run following commands:</p> <div class="language- extra-class"><pre class="language-text"><code>mkdir bin
touch bin/parallel.js
chmod +x bin/parallel.js
</code></pre></div><blockquote><p>Filename or directory can be customized. You are creating your own custom runner so take this paragraph as an example.</p></blockquote> <p>Create a placeholder in file:</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token hashbang comment">#!/usr/bin/env node</span>
<span class="token keyword">const</span> <span class="token punctuation">{</span> Workers<span class="token punctuation">,</span> event <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'codeceptjs'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// here will go magic</span>
</code></pre></div><p>Now let's see how to update this file for different parallelization modes:</p> <h3 id="example-running-tests-in-2-browsers-in-4-threads"><a href="#example-running-tests-in-2-browsers-in-4-threads" class="header-anchor">#</a> Example: Running tests in 2 browsers in 4 threads</h3> <div class="language-js extra-class"><pre class="language-js"><code><span class="token keyword">const</span> workerConfig <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token literal-property property">testConfig</span><span class="token operator">:</span> <span class="token string">'./test/data/sandbox/codecept.customworker.js'</span><span class="token punctuation">,</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">// don't initialize workers in constructor</span>
<span class="token keyword">const</span> workers <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Workers</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> workerConfig<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// split tests by suites in 2 groups</span>
<span class="token keyword">const</span> testGroups <span class="token operator">=</span> workers<span class="token punctuation">.</span><span class="token function">createGroupsOfSuites</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> browsers <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token string">'firefox'</span><span class="token punctuation">,</span> <span class="token string">'chrome'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">const</span> configs <span class="token operator">=</span> browsers<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token parameter">browser</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token punctuation">{</span>
<span class="token literal-property property">helpers</span><span class="token operator">:</span> <span class="token punctuation">{</span>
<span class="token literal-property property">WebDriver</span><span class="token operator">:</span> <span class="token punctuation">{</span> browser <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">const</span> config <span class="token keyword">of</span> configs<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>group <span class="token keyword">of</span> testGroups<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> worker <span class="token operator">=</span> workers<span class="token punctuation">.</span><span class="token function">spawn</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
worker<span class="token punctuation">.</span><span class="token function">addTests</span><span class="token punctuation">(</span>group<span class="token punctuation">)</span><span class="token punctuation">;</span>
worker<span class="token punctuation">.</span><span class="token function">addConfig</span><span class="token punctuation">(</span>config<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token comment">// Listen events for failed test</span>
workers<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>test<span class="token punctuation">.</span>failed<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">failedTest</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Failed : '</span><span class="token punctuation">,</span> failedTest<span class="token punctuation">.</span>title<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// Listen events for passed test</span>
workers<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>test<span class="token punctuation">.</span>passed<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">successTest</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Passed : '</span><span class="token punctuation">,</span> successTest<span class="token punctuation">.</span>title<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// test run status will also be available in event</span>
workers<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>all<span class="token punctuation">.</span>result<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token comment">// Use printResults() to display result with standard style</span>
workers<span class="token punctuation">.</span><span class="token function">printResults</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// run workers as async function</span>
<span class="token function">runWorkers</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token function">runWorkers</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
<span class="token comment">// run bootstrapAll</span>
<span class="token keyword">await</span> workers<span class="token punctuation">.</span><span class="token function">bootstrapAll</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// run tests</span>
<span class="token keyword">await</span> workers<span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
<span class="token comment">// run teardown All</span>
<span class="token keyword">await</span> workers<span class="token punctuation">.</span><span class="token function">teardownAll</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><p>Inside <code>event.all.result</code> you can obtain test results from all workers, so you can customize the report:</p> <div class="language-js extra-class"><pre class="language-js"><code>workers<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>all<span class="token punctuation">.</span>result<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">status<span class="token punctuation">,</span> completedTests<span class="token punctuation">,</span> workerStats</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token comment">// print output</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'Test status : '</span><span class="token punctuation">,</span> status <span class="token operator">?</span> <span class="token string">'Passes'</span> <span class="token operator">:</span> <span class="token string">'Failed '</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// print stats</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Total tests : </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>workerStats<span class="token punctuation">.</span>tests<span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Passed tests : </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>workerStats<span class="token punctuation">.</span>passes<span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Failed test tests : </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>workerStats<span class="token punctuation">.</span>failures<span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// If you don't want to listen for failed and passed test separately, use completedTests object</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">const</span> test <span class="token keyword">of</span> Object<span class="token punctuation">.</span><span class="token function">values</span><span class="token punctuation">(</span>completedTests<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Test status: </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>test<span class="token punctuation">.</span>err<span class="token operator">===</span><span class="token keyword">null</span><span class="token interpolation-punctuation punctuation">}</span></span><span class="token string">, </span><span class="token template-punctuation string">`</span></span><span class="token punctuation">,</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Test : </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>test<span class="token punctuation">.</span>title<span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><h3 id="example-running-tests-split-by-a-custom-function"><a href="#example-running-tests-split-by-a-custom-function" class="header-anchor">#</a> Example: Running Tests Split By A Custom Function</h3> <p>If you want your tests to split according to your need this method is suited for you. For example: If you have 4 long running test files and 4 normal test files there chance all 4 tests end up in same worker thread. For these cases custom function will be helpful.</p> <div class="language-js extra-class"><pre class="language-js"><code>
<span class="token comment">/*
Define a function to split your tests.
function should return an array with this format [[file1, file2], [file3], ...]
where file1 and file2 will run in a worker thread and file3 will run in a worker thread
*/</span>
<span class="token keyword">const</span> <span class="token function-variable function">splitTests</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token keyword">const</span> files <span class="token operator">=</span> <span class="token punctuation">[</span>
<span class="token punctuation">[</span><span class="token string">'./test/data/sandbox/guthub_test.js'</span><span class="token punctuation">,</span> <span class="token string">'./test/data/sandbox/devto_test.js'</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">[</span><span class="token string">'./test/data/sandbox/longrunnig_test.js'</span><span class="token punctuation">]</span>
<span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">return</span> files<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">const</span> workerConfig <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token literal-property property">testConfig</span><span class="token operator">:</span> <span class="token string">'./test/data/sandbox/codecept.customworker.js'</span><span class="token punctuation">,</span>
<span class="token literal-property property">by</span><span class="token operator">:</span> splitTests
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">// don't initialize workers in constructor</span>
<span class="token keyword">const</span> customWorkers <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Workers</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">,</span> workerConfig<span class="token punctuation">)</span><span class="token punctuation">;</span>
customWorkers<span class="token punctuation">.</span><span class="token function">run</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// You can use event listeners similar to above example.</span>
customWorkers<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>all<span class="token punctuation">.</span>result<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
workers<span class="token punctuation">.</span><span class="token function">printResults</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h3 id="emitting-messages-to-the-parent-worker"><a href="#emitting-messages-to-the-parent-worker" class="header-anchor">#</a> Emitting messages to the parent worker</h3> <p>Child workers can send non-test events to the main process. This is useful if you want to pass along information not related to the tests event cycles itself such as <code>event.test.success</code>.</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// inside main process</span>
<span class="token comment">// listen for any non test related events</span>
workers<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">'message'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
workers<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span>event<span class="token punctuation">.</span>all<span class="token punctuation">.</span>result<span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">status<span class="token punctuation">,</span> completedTests<span class="token punctuation">,</span> workerStats</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
<span class="token comment">// logic</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div><h2 id="sharing-data-between-workers"><a href="#sharing-data-between-workers" class="header-anchor">#</a> Sharing Data Between Workers</h2> <p>NodeJS Workers can communicate between each other via messaging system. It may happen that you want to pass some data from one of the workers to other. For instance, you may want to share user credentials accross all tests. Data will be appended to a container.</p> <p>However, you can't access uninitialized data from a container, so to start, you need to initialize data first. Inside <code>bootstrap</code> function of the config we execute the <code>share</code> to initialize value:</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// inside codecept.conf.js</span>
exports<span class="token punctuation">.</span>config <span class="token operator">=</span> <span class="token punctuation">{</span>
<span class="token function">bootstrap</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">// append empty userData to container</span>
<span class="token function">share</span><span class="token punctuation">(</span><span class="token punctuation">{</span> <span class="token literal-property property">userData</span><span class="token operator">:</span> <span class="token boolean">false</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div><p>Now each worker has <code>userData</code> inside a container. However, it is empty.
When you obtain real data in one of the tests you can now <code>share</code> this data accross tests. Use <code>inject</code> function to access data inside a container:</p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token comment">// get current value of userData</span>
<span class="token keyword">let</span> <span class="token punctuation">{</span> userData <span class="token punctuation">}</span> <span class="token operator">=</span> <span class="token function">inject</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// if userData is still empty - update it</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>userData<span class="token punctuation">)</span> <span class="token punctuation">{</span>
userData <span class="token operator">=</span> <span class="token punctuation">{</span> <span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">'user'</span><span class="token punctuation">,</span> <span class="token literal-property property">password</span><span class="token operator">:</span> <span class="token string">'123456'</span> <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">// now new userData will be shared accross all workers</span>
<span class="token function">share</span><span class="token punctuation">(</span><span class="token punctuation">{</span><span class="token literal-property property">userData</span> <span class="token operator">:</span> userData<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre></div><p>If you want to share data only within same worker, and not across all workers, you need to add option <code>local: true</code> every time you run <code>share</code></p> <div class="language-js extra-class"><pre class="language-js"><code><span class="token function">share</span><span class="token punctuation">(</span><span class="token punctuation">{</span> <span class="token literal-property property">userData</span><span class="token operator">:</span> <span class="token boolean">false</span> <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token literal-property property">local</span><span class="token operator">:</span> <span class="token boolean">true</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div></div></article></div> <div class="page-edit"><div class="edit-link"><a href="https://github.com/codeceptjs/codeceptjs/edit/3.x/docs/parallel.md" target="_blank" rel="noopener noreferrer">Help us improve this page!</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">Last Updated:</span> <span class="time">12/20/2023, 1:01:55 AM</span></div></div> <div class="page-nav"><p class="inner"><span class="prev">
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