#Requires -Modules Pester
$global:here = (Split-Path -Parent $MyInvocation.MyCommand.Path)
$global:function = ((Split-Path -leaf $MyInvocation.MyCommand.Path).Split('.'))[0]

Describe $global:function -Tag 'Unit', 'Source', 'Built' {
    BeforeAll {
        $script:ScriptBlock = (Get-Command $global:function).ScriptBlock
    }

    Context "$($global:function)::Parameter Unit Tests" {

        It "$global:function should have exactly 16 parameters defined" {
            (Get-Command $global:function).Parameters.Count | Should -Be 16
        }

        $ParameterTestCases = @(
            @{ParameterName = 'SourceVpgName'; Type = 'String'; Mandatory = $true; Validation = 'NotNullOrEmpty' }
            @{ParameterName = 'NewVpgName'; Type = 'String'; Mandatory = $true; Validation = 'NotNullOrEmpty' }
            @{ParameterName = 'VMs'; Type = 'String[]'; Mandatory = $true; Validation = 'NotNullOrEmpty' }
        )

        It "<ParameterName> parameter is of <Type> type" -TestCases $ParameterTestCases {
            param($ParameterName, $Type, $Mandatory)
            Get-Command $global:function | Should -HaveParameter $ParameterName -Mandatory:$Mandatory -Type $Type
        }

        It "<ParameterName> parameter has correct validation setting"  -TestCases $ParameterTestCases {
            param($ParameterName, $Validation)
            Switch ($Validation) {
                'NotNullOrEmpty' {
                    $attrs = (Get-Command $global:function).Parameters[$ParameterName].Attributes
                    $attrs.Where{ $_ -is [ValidateNotNullOrEmpty] }.Count | Should -Be 1
                }

                $null {
                    $attrs = (Get-Command $global:function).Parameters[$ParameterName].Attributes
                    $attrs.TypeId.Count | Should -Be 2
                }
            }
        }

        It "Supports 'SupportsShouldProcess'" {
            Get-Command $global:function | Should -HaveParameter WhatIf
            Get-Command $global:function | Should -HaveParameter Confirm
            $script:ScriptBlock | Should -match 'SupportsShouldProcess'
            $script:ScriptBlock | Should -match '\$PSCmdlet\.ShouldProcess\(.+\)'
        }
    }

    Context "$($global:function)::Function Unit Tests" {

    }
}

Remove-Variable -Name function -Scope Global
Remove-Variable -Name here -Scope Global