Tests, only after a call of Save-Module, the case of the file names of a published module (.nupkg).

Test-ModuleNaming.ps1

function Test-ModuleNaming {
   #We test the naming of a module.
   #see : https://github.com/PowerShell/PowerShell/issues/17342
   #      https://github.com/Splaxi/PSNotification/issues/15
   param(
      #Name of module directory to check.The name come from the nuget package ( case sensitive)
      $ModuleName,

      $Version,

      #Path where the module was saved by Save-ModuleCache.
      $SavePath
   )
   if ($null -eq $Version)
   { throw "Assert: Test-ModuleNaming '-Version' parameter must be filled in." }

   $ModuleRegex = [RegEx]::Escape($ModuleName) + '\.(psd1|psm1|ni\.dll|dll|exe)$'
   $Files = Get-ChildItem "$SavePath\$ModuleName\$Version\$ModuleName.*" -Include *.psd1, *.psm1, *.ni.dll, *.dll, *.exe
   If ($Files.Count -eq 0) {
      Write-Warning "The module directory must contain at least one file of one of these types .psd1 or .psm1 or .ni.dll or .dll or .exe : '$SavePath\$ModuleName\$Version'"
      #This is not a naming error
      return $true
   }

   Foreach ($File in $Files) {
      $isNamingCorrect = $File -cMatch $ModuleRegex
      switch ($File.Extension) {
         #If a correctly named manifest exists we quit without warning otherwise we warn and then we quit.
         #If no manifest exists we continue the search.
         '.psd1' { if (-not $isNamingCorrect) { Write-Warning "Module manifest name is invalid under Ubuntu : '$file'" }; return }
         '.psm1' { if (-not $isNamingCorrect) { Write-Warning "Script module name is invalid under Ubuntu : '$file'" }; return }
         #'.ni.dll' see PS Core source 'PowerShellNgenAssemblyExtension'
         # Note : "Test.no.dll"' match '.dll'
         { '.ni.dll', '.dll' -eq $_ } { if (-not $isNamingCorrect) { Write-Warning "Binary module name is invalid under Ubuntu : '$file'" }; return }
         #See use case :https://github.com/PowerShell/PowerShell/issues/6741#issuecomment-385746538
         '.exe' { if (-not $isNamingCorrect) { Write-Warning "Executable name is invalid under Ubuntu : '$file'" }; return }
         # Windows Powershell only : CDXML (WMI) or .xaml (Workflow).
      }
   }
   return $isNamingCorrect
}