test.1.invocation.ps1

$ErrorActionPreference = 'Stop'

# set location to this script directory
$PSScriptRoot = Split-Path $MyInvocation.MyCommand.Definition
Set-Location -LiteralPath $PSScriptRoot

# make the directory "test[" and the script "test.ps1" in it
$null = mkdir test[ -Force
Set-Content -LiteralPath test[\test.ps1 -Value 42

# this works in v2, v3, v4, v7 and fails in v5, v6
try {
	& '.\test[\test.ps1'
}
catch {
	$_
}

# this fails due to the invalid wildcard
# fixed in v7
try {
	& "$PSScriptRoot\test[\test.ps1"
}
catch {
	$_
}

Remove-Item -LiteralPath test[ -Force -Recurse