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41.313 2.05 3.093 2.05 4.95s-0.738 3.637-2.05 4.95c-1.313 1.313-3.093 2.05-4.95 2.05v-14c1.857 0 3.637 0.737 4.95 2.05z"/></svg></button></div></div></div><div role=presentation class=navbar-sidebar__backdrop></div></nav><div id=__docusaurus_skipToContent_fallback class="theme-layout-main main-wrapper mainWrapper_M1bJ"><header class=hero_syme><div class="container heroInner_VWeJ"><div class=heroBadges_LdwS><span class=badge_oX1U>Open source</span><span class=badge_oX1U>Cross-platform</span><span class=badge_oX1U>PowerShell 5.1 & 7.4+</span></div><h1 class=heroTitle_ohkl>Test your PowerShell.<br/><span class=heroTitleAccent_d7Sc>Ship with confidence.</span></h1><p class=heroSubtitle_GKHc>Pester is the ubiquitous test and mock framework for PowerShell — expressive syntax, powerful mocking and beautiful output, everywhere PowerShell runs.<div class=heroButtons_gdhS><a class="button button--lg primaryButton_wDDj" href=/docs/quick-start>Quick Start</a><a class="button button--lg secondaryButton_ZLk9" href=/tutorial/introduction/welcome>Tutorial<span class=buttonArrow_hyAN aria-hidden=true>→</span></a><a href=https://github.com/pester/pester target=_blank rel="noopener noreferrer" class="button button--lg githubButton_Bgng"><svg width=20 height=20 viewBox="0 0 16 16" fill=currentColor aria-hidden=true><path d="M8 0C3.58 0 0 3.58 0 8a8 8 0 0 0 5.47 7.59c.4.07.55-.17.55-.38l-.01-1.49c-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82a7.4 7.4 0 0 1 2-.27c.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48l-.01 2.2c0 .21.15.46.55.38A8 8 0 0 0 16 8c0-4.42-3.58-8-8-8Z"/></svg>Star on GitHub</a></div><button type=button class=installBox_fIqj aria-label="Copy install command"><span class=installPrompt_M6aW>PS></span><code class=installText_C4oc>Install-Module Pester</code><span class=installCopy_iv_B>Copy</span></button><div class=platforms_RjDm><span>Windows</span><span>Linux</span><span>macOS</span><span>Azure Pipelines</span><span>GitHub Actions</span></div><div class=heroShot_IPZe><img src=/img/home/hero-terminal.png alt="Example of Pester test output showing passing and failing tests" loading=lazy /></div></div></header><main><section class=section_rC2D><div class="container sectionInner_Y4r1"><div class=sectionHead_ArI0><h2 class=sectionTitle_czhA>Two ways to start</h2><p class=sectionLead_c8wK>Read the short version, or build a module from scratch and test it as you go.</div><div class=pathGrid_Or2B><div class=pathCard_fFQW><span class=pathMeta_Dhmc>About 5 minutes</span><h3 class=pathTitle_ipve>Quick Start</h3><p class=pathDesc_Yfkq>The short version. Install Pester, write one test file, run it, and see what a failure looks like.<ul class=pathPoints_hWj5><li>Install and import Pester<li>Write and run your first test<li>Read the failure output</ul><a class="button pathActionOutline_YruY pathAction_f6gj" href=/docs/quick-start>Read the Quick Start</a></div><div class="pathCard_fFQW pathCardFeatured_VkQh"><span class=pathMeta_Dhmc>Seven parts, at your own pace</span><h3 class=pathTitle_ipve>Follow-along tutorial</h3><p class=pathDesc_Yfkq>Start with an empty folder and build a real PowerShell module, writing tests for each part as you add it.<ul class=pathPoints_hWj5><li>Test public functions and private helpers<li>Mock a data source and isolate file operations<li>Measure code coverage and run it all in CI</ul><a class="button button--primary pathAction_f6gj" href=/tutorial/introduction/welcome>Start the tutorial</a></div></div></div></section><section class=section_rC2D><div class="container sectionInner_Y4r1"><div class=sectionHead_ArI0><h2 class=sectionTitle_czhA>Write your first test in seconds</h2><p class=sectionLead_c8wK>Save a <code>*.Tests.ps1</code> file, describe what your code should do, and run it. Pester handles discovery, execution and reporting.</div><div class=codeGrid_THOg><div class=codeCol_aZog><div class="language-powershell codeBlockContainer_ENqm theme-code-block" style=--prism-color:#393A34;--prism-background-color:#f6f8fa><div class=codeBlockTitle_dd33>Get-Planet.Tests.ps1</div><div class=codeBlockContent_INw7><pre tabindex=0 class="prism-code language-powershell codeBlock_uEy6 thin-scrollbar" style=color:#393A34;background-color:#f6f8fa><code class=codeBlockLines_bUFg><div class=token-line style=color:#393A34><span class="token plain">BeforeAll </span><span class="token punctuation" style=color:#393A34>
4{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">    </span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain"> </span><span class="token variable" style=color:#36acaa>$PSScriptRoot</span><span class="token operator" style=color:#393A34>/</span><span class="token function" style=color:#d73a49>Get-Planet</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">ps1</span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain" style=display:inline-block></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">Describe </span><span class="token string" style=color:#e3116c>'Get-Planet'</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">    It </span><span class="token string" style=color:#e3116c>'lists all 8 planets'</span><span class="token plain"> </span><span class="token punctuation" style=color:#393A34>{</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">        </span><span class="token variable" style=color:#36acaa>$planets</span><span class="token plain"> = </span><span class="token function" style=color:#d73a49>Get-Planet</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain">        </span><span class="token variable" style=color:#36acaa>$planets</span><span class="token punctuation" style=color:#393A34>.</span><span class="token plain">Count </span><span class="token punctuation" style=color:#393A34>|</span><span class="token plain"> Should-Be 8</span><br/></div><div class=token-line style=color:#393A34><span class="token plain">    </span><span class="token punctuation" style=color:#393A34>}</span><span class="token plain"></span><br/></div><div class=token-line style=color:#393A34><span class="token plain"></span><span class="token punctuation" style=color:#393A34>}</span><br/></div></code></pre></div></div></div><div class=codeCol_aZog><div class=shotFrame_OV18><img src=/img/home/output-run.png alt="Pester console output with a passing test" loading=lazy /></div><p class=shotCaption_GnQW>Green when it passes — and a precise, readable diff the moment it doesn't.</div></div></div></section><section class="section_rC2D sectionAlt_XiGz"><div class="container sectionInner_Y4r1"><div class=sectionHead_ArI0><h2 class=sectionTitle_czhA>Everything you need to test PowerShell</h2><p class=sectionLead_c8wK>From a one-line assertion to validating entire environments — Pester scales with you.</div><div class=featureGrid_g0sL><div class=featureCard_PiI4><div class=featureIcon_WheO><svg width=26 height=26 viewBox="0 0 24 24" fill=none stroke=currentColor stroke-width=1.8 stroke-linecap=round stroke-linejoin=round><polyline points="8 7 3 12 8 17"/><polyline points="16 7 21 12 16 17"/><line x1=13.5 y1=5 x2=10.5 y2=19 /></svg></div><h3 class=featureTitle_bNEx>Readable, expressive syntax</h3><p class=featureDesc_JIJu>Describe, Context, It and Should read like plain English. Tests document intent instead of hiding it in boilerplate.</div><div class=featureCard_PiI4><div class=featureIcon_WheO><svg width=26 height=26 viewBox="0 0 24 24" fill=none stroke=currentColor stroke-width=1.8 stroke-linecap=round stroke-linejoin=round><path d="M3 12a4 4 0 0 1 4-4h3v8H7a4 4 0 0 1-4-4Z"/><path d="M21 12a4 4 0 0 1-4 4h-3V8h3a4 4 0 0 1 4 4Z"/><path d="M10 9l4 6"/></svg></div><h3 class=featureTitle_bNEx>Powerful mocking</h3><p class=featureDesc_JIJu>Replace any command with a mock, control what it returns, and assert exactly how it was called — no dependency injection required.</div><div class=featureCard_PiI4><div class=featureIcon_WheO><svg width=26 height=26 viewBox="0 0 24 24" fill=none stroke=currentColor stroke-width=1.8 stroke-linecap=round stroke-linejoin=round><path d="M12 3l7 3v5c0 4.4-3 8.3-7 9-4-0.7-7-4.6-7-9V6l7-3Z"/><polyline points="9 12 11.5 14.5 16 9.5"/></svg></div><h3 class=featureTitle_bNEx>Built-in code coverage</h3><p class=featureDesc_JIJu>See which lines your tests exercise and export JaCoCo or Cobertura reports your pipeline already understands.</div><div class=featureCard_PiI4><div class=featureIcon_WheO><svg width=26 height=26 viewBox="0 0 24 24" fill=none stroke=currentColor stroke-width=1.8 stroke-linecap=round stroke-linejoin=round><circle cx=12 cy=12 r=9 /><path d="M3 12h18"/><path d="M12 3c2.7 3 2.7 15 0 18M12 3c-2.7 3-2.7 15 0 18"/></svg></div><h3 class=featureTitle_bNEx>Runs everywhere</h3><p class=featureDesc_JIJu>PowerShell 7.4+ on Windows, Linux and macOS — test the same code everywhere it runs.</div><div class=featureCard_PiI4><div class=featureIcon_WheO><svg width=26 height=26 viewBox="0 0 24 24" fill=none stroke=currentColor stroke-width=1.8 stroke-linecap=round stroke-linejoin=round><rect x=3 y=4 width=18 height=13 rx=2 /><path d="M8 20h8M12 17v3"/><polyline points="8.5 9 6.5 11 8.5 13"/><line x1=12 y1=8.5 x2=10.5 y2=13.5 /></svg></div><h3 class=featureTitle_bNEx>First-class VS Code</h3><p class=featureDesc_JIJu>Run and debug tests straight from the Test Explorer, jump to failures, and scaffold tests with snippets.</div><div class=featureCard_PiI4><div class=featureIcon_WheO><svg width=26 height=26 viewBox="0 0 24 24" fill=none stroke=currentColor stroke-width=1.8 stroke-linecap=round stroke-linejoin=round><path d="M4 12a8 8 0 0 1 13.6-5.7L20 8"/><polyline points="20 3 20 8 15 8"/><path d="M20 12a8 8 0 0 1-13.6 5.7L4 16"/><polyline points="4 21 4 16 9 16"/></svg></div><h3 class=featureTitle_bNEx>CI/CD ready</h3><p class=featureDesc_JIJu>Emit NUnit or JUnit results for GitHub Actions, Azure Pipelines, Jenkins and more. Fail the build when a test fails.</div></div></div></section><section class="section_rC2D credibility_eaY5"><div class="container sectionInner_Y4r1"><div class=statRow_LZfs><div class=stat_ezPZ><img alt="GitHub stars" src="https://img.shields.io/github/stars/pester/pester?style=flat-square&label=GitHub%20stars&color=0072c5"/></div><div class=stat_ezPZ><img alt="PowerShell Gallery downloads" src="https://img.shields.io/powershellgallery/dt/Pester?style=flat-square&label=Gallery%20downloads&color=0072c5"/></div><div class=stat_ezPZ><img alt="Latest Pester version" src="https://img.shields.io/powershellgallery/v/Pester?style=flat-square&label=latest&color=0072c5"/></div></div><p class=credibilityNote_pwZq>Pester is the standard test framework for PowerShell — trusted by the PowerShell project itself and team
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