Parallel-Tests.ps1

param(
    [string[]] $directories,
    [string] $testFilter,
    [string] $outDir,
    [string] $dotnet)

$maxDegreeOfParallelism = 4
$failed = $false

function Receive-CompletedJobs {
    $succeeded = $true
    foreach($job in (Get-Job | Where-Object { $_.State -ne 'Running' }))
    {
        Receive-Job $job -AutoRemoveJob -Wait | Write-Host

        if ($job.State -eq 'Failed') { 
            $succeeded = $false
            Write-Host -ForegroundColor Red 'Failed: ' $job.Name '('$job.State')'
        }
        Write-Host ''  
    }
    return $succeeded
}

$ExecuteCmd =
{
    param([string] $dotnet1, [string] $args1, [string] $path)

    Set-Location -Path $path

    $cmdline = "& `"" + $dotnet1 + "`" " + $args1

    Invoke-Expression $cmdline
    if ($LASTEXITCODE -ne 0)
    {
        Throw "Error when running tests"
    }
}

foreach ($d in $directories)
{
    $running = @(Get-Job | Where-Object { $_.State -eq 'Running' })
    if ($running.Count -ge $maxDegreeOfParallelism) {
        $running | Wait-Job -Any | Out-Null
    }

    if (-not (Receive-CompletedJobs)) { $failed = $true }

    $xmlName = 'xUnit-Results-' + [System.IO.Path]::GetFileName($d) + '.xml'
    $outXml = $(Join-Path $outDir $xmlName)
    $cmdLine = 'xunit ' + $testFilter + ' -xml ' + $outXml + ' -parallel none -noshadow -nobuild -configuration ' + $env:BuildConfiguration
    Write-Host $dotnet $cmdLine
    Start-Job $ExecuteCmd -ArgumentList @($dotnet, $cmdLine, $d) -Name $([System.IO.Path]::GetFileName($d)) | Out-Null
    Write-Host ''
}

# Wait for all jobs to complete and results ready to be received
Wait-Job * | Out-Null

if (-not (Receive-CompletedJobs)) { $failed = $true }

if ($failed)
{
    Write-Host 'Test run failed'
    Exit 1
}