function Test-ChocoPackagesAvailablePrivate {
<#
.SYNOPSIS
    Verifies that a list of packages and their versions are available in the Chocolatey package feed.
    Returns a delimited list of packages that were not found. i.e. Alkami.Package1|1.0.0,Alkami.Package2|1.0.1

.PARAMETER Packages
    Array of Package Objects to Test Availability based on configured feeds

.PARAMETER NugetCredential
    Credential object for Nuget server
#>
    [CmdletBinding()]
    Param(
        [Parameter(Mandatory = $true)]
        [object[]]$Packages,
        [Parameter(Mandatory = $true)]
        [pscredential]$NugetCredential
    )
    $logLead = (Get-logLeadName)

    Write-Host "$logLead : Verifying that all choco packages exist in the feed."

    # Assign package sources to each package.
    # HACK: Currently, _this_ function is ONLY called by it's non-private counterpart Test-ChocoPackagesAvailable
    #       which is ONLY called by TDC's Test-ChcooPackagesAvailable.ps1
    #       However, Set-ChocoPackageSourceFeeds is called by a LOT of other things, so it has
    #       a new Parameter "-MissingPackageLogLevel" that defaults to ERROR to maintain default behavior
    #       SRE-15611 needs this to not Write-Error for Missing Packages. That's the whole point of this
    #       call - to get a list of Missing Packages so that we can either AutoPromote them or
    #       use TeamCity's "buildProblem" outputs to fail while bubbling information up
    Set-ChocoPackageSourceFeeds -Packages $packages -MissingPackageLogLevel "WARNING"

    $missingPackages = @()
    $success = $true
    $packages | ForEach-Object {
        $foundCurrentPackage = $false
        $name = $_.Name
        $version = $_.Version
        if ($null -eq $_.Feed) {
            #badnews
            Write-Warning "$logLead : Package: $name $version has NULL FEED"
        } else {
            # This was throwing a NPE when the Package was not assigned a Feed from Set-ChocoPackageSourceFeeds
            $feed = ($_.feed.Source).TrimEnd('/') # Just in case the source has a trailing '/'

            try {
                $authHeaders = @{
                    Authorization = 'Basic ' + [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes("$($NugetCredential.UserName):$(Get-PasswordFromCredential $NugetCredential)"))
                }

                $result = @(Invoke-WebRequest -Headers $authHeaders "$feed/Packages(Id='$name',Version='$version')" -ErrorAction SilentlyContinue)
                if ($result.StatusCode -eq 200) {
                    Write-Host "$logLead : Package: $name $version found on Feed: $feed"
                    $foundCurrentPackage = $true
                } else {
                    Write-Warning "$logLead : Package: $name $version not found on Feed: $feed"
                }
            } catch {
                Write-Warning "$logLead : Package: $name $version not found on Feed: $feed"
            }
        }

        if (-not $foundCurrentPackage) {
            $feedString = if ($_.Feed) { $feed } else { "NULL FEED" }
            Write-Warning "$logLead : Package: $name $version not found on Feed: $feedString"
            $missingPackages += $_
            [System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseDeclaredVarsMoreThanAssignments", "", Justification = "Variable assignment is used further down in IF statement.  False positive.")]
            $success = $false
        }
    }

    if ($success) {
        Write-Host "$logLead : All Chocolatey packages are available in the feed."
    } else {
        Write-Host "$logLead : There are required Chocolatey package(s) that are unavailable in the Chocolatey feed!"
        Write-Host $missingPackages

        return (($missingPackages | ForEach-Object { "$($_.Name)|$($_.Version)" }) -join ",")
    }
}