It '$input Type should be enumerator' {
        function from_begin { [cmdletbinding()]param() begin { Write-Output -NoEnumerate $input } }
        function from_process { [cmdletbinding()]param() process { Write-Output -NoEnumerate $input } }
        function from_end { [cmdletbinding()]param() end { Write-Output -NoEnumerate $input } }

        (from_begin) -is [System.Collections.IEnumerator] | Should Be $true
        (from_process) -is [System.Collections.IEnumerator] | Should Be $true
        (from_end) -is [System.Collections.IEnumerator] | Should Be $true
    } 

        (from_begin) -is [System.Collections.ArrayList] | Should Be $true
        (from_process) -is [System.Collections.ArrayList] | Should Be $true
        (from_end) -is [System.Object[]] | Should Be $true