$ErrorActionPreference = 'Stop'
$tokens = $null
$errors = $null
$ast = [System.Management.Automation.Language.Parser]::ParseFile(
    (Join-Path $PSScriptRoot 'configure-caddy.ps1'), [ref]$tokens, [ref]$errors)
if ($errors.Count) { throw ($errors | Out-String) }
$fn = $ast.Find({param($n) $n -is [System.Management.Automation.Language.FunctionDefinitionAst]}, $true)
Invoke-Expression $fn.Extent.Text
$good = '{"handle":[{"handler":"subroute","routes":[{"match":[{"path":["/"]}],"handle":[{"handler":"static_response"}]},{"handle":[{"handler":"static_response"}]}]}]}' | ConvertFrom-Json
if (-not (Test-StaticFallback @($good))) { throw 'Static fallback rejected' }
$good.handle[0].routes[1].handle[0].handler = 'authentication'
if (Test-StaticFallback @($good)) { throw 'Authentication fallback accepted' }
$good.handle[0].routes[1].handle[0].handler = 'reverse_proxy'
if (Test-StaticFallback @($good)) { throw 'Proxy fallback accepted' }
if (Test-StaticFallback @()) { throw 'Empty fallback accepted' }
Write-Output 'PASS: syntax, nested static fallback, authentication/proxy/empty guards'