Тест pipe в функции Powershell

Test-PipeInFunction.ps1

function Test-PipeInFunction
{
    [CmdletBinding()]
    [Alias()]
    [OutputType([String])]
    Param
    (
        [Parameter(Mandatory=$true, 
                   ValueFromPipeline=$true,
                   ValueFromPipelineByPropertyName=$true, 
                   ValueFromRemainingArguments=$false, 
                   Position=0)]
        [ValidateNotNull()]
        [ValidateNotNullOrEmpty()]
        $Param1
    )

    Begin
    {
        'Call first begin block with Param: ' + $Param1
        'Call second begin block with $_: ' + $_
    }
    Process
    {
        'Call process block: ' + $Param1
    }
    End
    {
        'Call end block: ' + $Param1
    }
}

$Array = '1','2','3'

$Array | Test-PipeInFunction