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pester-migration

Pester migration skill for upgrading PowerShell Pester test suites across major versions — v3→v4, v4→v5, and v5→v6. Covers the Discovery/Run two-phase model, moving setup into BeforeAll, $PSScriptRoot vs $MyInvocation, mock changes (Assert-MockCalled → Should -Invoke, removed fall-through), Invoke-Pester parameters → PesterConfiguration, data-driven -ForEach/-TestCases, and the v6 breaking changes. Use when the user asks to upgrade, migrate, or modernize Pester tests, fix *.Tests.ps1 files that broke after bumping the Pester version, or convert legacy Should / Invoke-Pester syntax.

skills/pester-migration/SKILL.md

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# Pester Migration

Pester is the test framework for PowerShell. Test files end in `*.Tests.ps1` and use
`Describe` / `Context` / `It` blocks with `Should` assertions. This skill upgrades an existing
suite from one major Pester version to the next and gets it green again.

> **Mental model:** each major jump has a different character. **v3→v4** is mostly a syntax
> rename. **v4→v5** is a *fundamental runtime change* (the Discovery/Run split) and is the hard
> one. **v5→v6** is largely backwards-compatible — a handful of previously-deprecated things now
> throw. Migrate **one major at a time**; never skip a version.

Detailed, symptom-driven guides live in `references/` — load the one(s) for the jump you are doing.

## References