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HelpSystem.Tests.ps1 cannot handle culture not being defined #27532

@ChrisTX

Description

@ChrisTX

Prerequisites

Steps to reproduce

Reproducible on 7.6.2.

The test "help should return full view without -Full switch" and "help should return full view even with -Full switch" have the problem, that they'll break if the current culture is Invariant Language (Invariant Country) (LCID 127). This can happen on Linux systems if the LANG etc. environment variables are left to C.UTF-8. In this situation, there's no Get-Help pages available in the current language - and thus no PARAMETERS section either on a "Full" help page, breaking the test.

In the past, UpdatableHelpSystem.Tests.ps1 has been fixed by 16558c9 and now sets a culture if LCID is 127. This test would need a similar fix.

Expected behavior

No error.

Actual behavior

[-] help should return full view without -Full switch 6ms
      Expected a value, but got $null or empty.
      425:         $gpsHelp | Where-Object {$_ -cmatch '^PARAMETERS'} | Should -Not -BeNullOrEmpty
      at <ScriptBlock>, /build/powershell/src/PowerShell/test/powershell/engine/Help/HelpSystem.Tests.ps1: line 425
    [-] help should return full view even with -Full switch 6ms
      Expected a value, but got $null or empty.
      434:         $gpsHelp | Where-Object {$_ -cmatch '^PARAMETERS'} | Should -Not -BeNullOrEmpty
      at <ScriptBlock>, /build/powershell/src/PowerShell/test/powershell/engine/Help/HelpSystem.Tests.ps1: line 434

Error details

Environment data

Name                           Value
----                           -----
PSVersion                      7.6.2
PSEdition                      Core
GitCommitId                    7.6.2-0-g0d3c290a8737d4252ee75c052d16190ffcdb7d19
OS                             Arch Linux
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.4
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

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