test(update): cover saved choices and unattended quick previews

scripts/test-quick-update.ps1

@@ -0,0 +1,6 @@
+[CmdletBinding()]
+param([switch]$Summary)
+$ErrorActionPreference = 'Stop'
+& python (Join-Path $PSScriptRoot 'test-quick-update.py')
+if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+Write-Output 'Tests: PASS | quick update selection'