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PowerShellのテスト Pesterのインストール

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PowerShellのテスト用フレームワーク、Pesterをインストールする。

Quick Start
https://pester.dev/docs/quick-start

今回のインストール先はMacのPowerShell。

$ pwsh
PowerShell 7.4.2
PS /mogemoge> Install-Module -Name Pester
PS /mogemoge> Import-Module Pester -PassThru                                 

ModuleType Version    PreRelease Name                                ExportedCo
                                                                     mmands
---------- -------    ---------- ----                                ----------
Script     5.6.0                 Pester                              {Add-Shou…

インストールが成功したので、ドキュメントの導入部分を触ってみる。
https://pester.dev/docs/quick-start

ドキュメントを「Splitting to tests and function」まで読み進めて、テストとテスト対象のスクリプトを分けて作成し、テストを走らせる。

Get-Planet.ps1
function Get-Planet ([string]$Name = '*') {
    $planets = @(
        @{ Name = 'Mercury' }
        @{ Name = 'Venus'   }
        @{ Name = 'Earth'   }
        @{ Name = 'Mars'    }
        @{ Name = 'Jupiter' }
        @{ Name = 'Saturn'  }
        @{ Name = 'Uranus'  }
        @{ Name = 'Neptune' }
    ) | ForEach-Object { [PSCustomObject] $_ }

    $planets | Where-Object { $_.Name -like $Name }
}
Get-Planet.Tests.ps1

BeforeAll {
    . $PSScriptRoot/Get-Planet.ps1
}

Describe 'Get-Planet' {
    It 'Given no parameters, it lists all 8 planets' {
        $allPlanets = Get-Planet
        $allPlanets.Count | Should -Be 8
    }
}
PS /Users/xxx/powershell> Invoke-Pester -Output Detailed Get-Planet.Tests.ps1
Pester v5.6.0

Starting discovery in 1 files.
Discovery found 1 tests in 2ms.
Running tests.

Running tests from '/Users/xxx/powershell/Get-Planet.Tests.ps1'
Describing Get-Planet
  [+] Given no parameters, it lists all 8 planets 4ms (3ms|1ms)
Tests completed in 18ms
Tests Passed: 1, Failed: 0, Skipped: 0, Inconclusive: 0, NotRun: 0

テストは成功。

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