Fix native collector subscription inventory and Unicode readback

tests/WecSubscriptionInventory.Tests.ps1

@@ -0,0 +1,34 @@
+$ErrorActionPreference='Stop';$repo=Split-Path $PSScriptRoot -Parent
+Import-Module "$repo/modules/WefSubscriptions.psm1" -Force
+& (Get-Module WefSubscriptions) {Initialize-WelaWecSubscriptionInventory}
+$count=0
+function Assert($Value,$Message){if(-not $Value){throw $Message};$script:count++}
+function Reject([scriptblock]$Action){$failed=$false;try{&$Action|Out-Null}catch{$failed=$true};Assert $failed 'Malformed, duplicate, partial or oversized native inventory must be rejected'}
+Assert ([Wela.WecInventory.Reader]::SourceSha256 -ceq (Get-FileHash "$repo/modules/WecSubscriptionInventory.cs").Hash.ToLowerInvariant()) 'Loaded inventory binds exact source bytes'
+Assert ([Wela.WecInventory.Reader]::ValidateNames([string[]]@()).Length -eq 0) 'Completed empty inventory is distinct from an error'
+$unicode='Name '+[char]0x65e5+[char]0x672c
+$names=[string[]]@('z',$unicode,'A',' leading ',([string][char]0xfeff))
+$observed=[Wela.WecInventory.Reader]::ValidateNames($names)
+Assert ($observed.Length -eq 5 -and $observed -ccontains $unicode -and $observed -ccontains ' leading ' -and $observed -ccontains ([string][char]0xfeff)) 'Actual Unicode and whitespace names are retained, never console-trimmed'
+Assert ($names[0] -ceq 'z') 'Validation does not mutate caller inventory'
+Reject {[Wela.WecInventory.Reader]::ValidateNames($null)}
+Reject {[Wela.WecInventory.Reader]::ValidateNames([string[]]@('same','SAME'))}
+Reject {[Wela.WecInventory.Reader]::ValidateNames([string[]]@(''))}
+Reject {[Wela.WecInventory.Reader]::ValidateNames([string[]]@("ab`0cd"))}
+Reject {[Wela.WecInventory.Reader]::ValidateNames([string[]]@('x'*1024))}
+Reject {[Wela.WecInventory.Reader]::ValidateNames([string[]]@([string][char]0xd800))}
+Reject {[Wela.WecInventory.Reader]::ValidateNames([string[]]@(1..4097|ForEach-Object {"id-$_"}))}
+Reject {[Wela.WecInventory.Reader]::ValidateNames([string[]]@(1..1025|ForEach-Object {$prefix=[string]$_;$prefix+('x'*(1023-$prefix.Length))}))}
+$buffer=[Runtime.InteropServices.Marshal]::AllocHGlobal(64)
+try {
+ for($i=0;$i -lt 64;$i++){[Runtime.InteropServices.Marshal]::WriteByte($buffer,$i,0)}
+ $bytes=[Text.Encoding]::Unicode.GetBytes($unicode+[char]0);[Runtime.InteropServices.Marshal]::Copy($bytes,0,$buffer,$bytes.Length)
+ Assert ([Wela.WecInventory.Reader]::DecodeName($buffer,($unicode.Length+1),32) -ceq $unicode) 'Native used length counts UTF16 characters including terminator'
+ foreach($used in @(0,1,33)){Reject {[Wela.WecInventory.Reader]::DecodeName($buffer,$used,32)}}
+ Reject {[Wela.WecInventory.Reader]::DecodeName([IntPtr]::Zero,2,32)}
+ Reject {[Wela.WecInventory.Reader]::DecodeName($buffer,2,1025)}
+ Reject {[Wela.WecInventory.Reader]::DecodeName($buffer,$unicode.Length,32)}
+ [Runtime.InteropServices.Marshal]::WriteInt16($buffer,2,0);Reject {[Wela.WecInventory.Reader]::DecodeName($buffer,($unicode.Length+1),32)}
+ [Runtime.InteropServices.Marshal]::WriteInt16($buffer,0,[int16]-10240);Reject {[Wela.WecInventory.Reader]::DecodeName($buffer,2,32)}
+}finally{[Runtime.InteropServices.Marshal]::FreeHGlobal($buffer)}
+Write-Host "PASS: $count native subscription inventory buffer/boundary assertions."