Public/Folder.ps1

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<#
.SYNOPSIS
    Test if a folder exists.
.DESCRIPTION
    Test if a folder exists.
.PARAMETER Target
    The path of the folder to search for.
.PARAMETER Should
    A Script Block defining a Pester Assertion.
.EXAMPLE
    folder $env:ProgramData { should exist }
.EXAMPLE
    folder C:\badfolder { should not exist }
.NOTES
    Assertions: exist
#>

function Folder {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory, Position=1)]
        [Alias('Path')]
        [string]$Target,

        [Parameter(Mandatory, Position=2)]
        [scriptblock]$Should
    )


    $params = Get-PoshspecParam -TestName Folder -TestExpression {'$Target'} @PSBoundParameters

    Invoke-PoshspecExpression @params
}