$ok = $false
1..30 | ForEach-Object {
  if (Test-NetConnection -ComputerName localhost -Port 5432 -WarningAction SilentlyContinue -ErrorAction SilentlyContinue | Where-Object { $_.TcpTestSucceeded }) {
    $ok = $true
    break
  }
  Start-Sleep -Seconds 1
}
if (-not $ok) { exit 1 }