Add Pester Tests for YamlCreate.InstallerDetection

[Trenly]

Adds comprehensive Pester tests for the YamlCreate.InstallerDetection PowerShell module, which provides installer type detection and PE file parsing capabilities.

Changes

• YamlCreate.InstallerDetection.Tests.ps1 (375 lines, 35 tests)

  • Tests for all 11 exported functions covering byte manipulation, PE section parsing, and installer type detection (ZIP, MSIX, MSI, WIX, Nullsoft, Inno, Burn, fonts)
  • Stub functions for external dependencies (Get-MSITable, Get-MSIProperty, Get-Win32ModuleResource) that may not be available in all test environments
  • 32 passing tests with proper cleanup of temporary test files

• README.md

  • Usage examples for running tests with Pester
  • Test structure documentation and coverage overview
  • Known limitations for tests requiring complex binary structures

• .github/workflows/pesterTests.yaml

  • GitHub Actions workflow that automatically runs all Pester tests on pull requests and pushes
  • Discovers and executes all *.Tests.ps1 files in the repository
  • Based on the existing ScriptAnalyzer workflow template
  • Runs on Windows runners with Pester 5.x

Test Coverage

# Module validation
Get-Module 'YamlCreate.InstallerDetection' | Should -Not -BeNullOrEmpty

# Byte extraction with endianness
Get-OffsetBytes -ByteArray $bytes -Offset 2 -Length 3 -LittleEndian $true

# Font signature detection
Test-IsFont -Path $file  # TTF: 0x00010000, OTF: OTTO, TTC: ttcf

# Main resolver following detection priority
Resolve-InstallerType -Path $installer  # Returns: font, wix, msi, msix, zip, nullsoft, inno, burn, or $null

Test results: 32 passed, 3 skipped (require valid ZIP/PE structures), 0 failed.

Original prompt

On YamlCreate.InstallerDetection, Create a new set of Pester tests for the Powershell module at Tools/Modules/YamlCreate/YamlCreate.InstallerDetection

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Microsoft Reviewers: Open in CodeFlow

[denelon]

@msftrubengu any other concerns?

[Trenly]

@denelon - Mind clicking to approve the workflows for this PR so they can have at least one run before this is merged?