param([Parameter(Mandatory=$true)][string]$Executable)
$ErrorActionPreference='Stop'
function Command([string]$Argument) {
    $commandProcess=Start-Process -FilePath $Executable -ArgumentList $Argument -WindowStyle Hidden -PassThru
    try {
        $null=$commandProcess.Handle
        $commandProcess.WaitForExit()
        return $commandProcess.ExitCode
    } finally { $commandProcess.Dispose() }
}
if ((Command '--status') -ne 3) { throw 'An isolated StayHere test instance is already running' }
$process=Start-Process -FilePath $Executable -WindowStyle Hidden -PassThru
$null=$process.Handle
try {
    $ready=$false
    for($i=0;$i -lt 20;$i++) {
        if((Command '--status') -eq 1){$ready=$true;break}
        Start-Sleep -Milliseconds 50
    }
    if(!$ready){throw 'StayHere did not start enabled'}
    if((Command '--pause') -ne 0 -or (Command '--status') -ne 2){throw 'StayHere pause failed'}
    if((Command '--resume') -ne 0 -or (Command '--status') -ne 1){throw 'StayHere resume failed'}
    if((Command '--exit') -ne 0 -or !$process.WaitForExit(3000)){throw 'StayHere exit failed'}
    if((Command '--status') -ne 3){throw 'StayHere instance remained after exit'}
    Write-Output 'Passed isolated StayHere start/status/pause/resume/exit checks'
} finally {
    if(!$process.HasExited){$null=Command '--exit';if(!$process.WaitForExit(3000)){$process.Kill()}}
    $process.Dispose()
}