functions/entitlementManagement/accessPackageAssignmentPolicies/Test-TmfAccessPackageAssignmentPolicy.ps1

function Test-TmfAccessPackageAssignmentPolicy
{
    <#
        .SYNOPSIS
            Test desired configuration against a Tenant.
        .DESCRIPTION
            Compare current configuration of a resource type with the desired configuration.
            Return a result object with the required changes and actions.
    #>

    [CmdletBinding()]
    Param (
        [System.Management.Automation.PSCmdlet]
        $Cmdlet = $PSCmdlet
    )
    
    begin
    {
        Test-GraphConnection -Cmdlet $Cmdlet
        $resourceName = "accessPackageAssignmentPolicies"
        $tenant = Get-MgOrganization -Property displayName, Id
    }
    process
    {
        foreach ($definition in $script:desiredConfiguration[$resourceName]) {
            foreach ($property in $definition.Properties()) {
                if ($definition.$property.GetType().Name -eq "String") {
                    $definition.$property = Resolve-String -Text $definition.$property
                }
            }

            $result = @{
                Tenant = $tenant.displayName
                TenantId = $tenant.Id
                ResourceType = 'AccessPackageAssignmentPolicy'
                ResourceName = (Resolve-String -Text $definition.displayName)
                DesiredConfiguration = $definition
            }

            $accessPackageId = $definition.accessPackageId()
            if (-Not $accessPackageId) {
                Write-PSFMessage -Level Host -String 'TMF.RelatedResourceDoesNotExist' -StringValues "Access Package", $accessPackage, $result.ResourceType, $result.ResourceName
                New-TestResult @result -ActionType "Create"                
                continue
            }

            try {            

                $resource = (Invoke-MgGraphRequest -Method GET -Uri ("$script:graphBaseUrl/identityGovernance/entitlementManagement/accessPackageAssignmentPolicies?`$filter=(displayname eq '{0}') and (accessPackageId eq '{1}')" -f [System.Web.HttpUtility]::UrlEncode($definition.displayName), $accessPackageId)).Value

                if (("oldNames" -in $definition.Properties()) -and (-not($resource))) {
                    foreach ($oldName in $definition.oldNames) {
                        $resource = (Invoke-MgGraphRequest -Method GET -Uri ("$script:graphBaseUrl/identityGovernance/entitlementManagement/accessPackageAssignmentPolicies?`$filter=(displayname eq '{0}') and (accessPackageId eq '{1}')" -f [System.Web.HttpUtility]::UrlEncode($oldName), $accessPackageId)).Value
                        if ($resource) {break}
                    }
                }
            }
            catch {
                Write-PSFMessage -Level Warning -String 'TMF.Error.QueryWithFilterFailed' -StringValues $filter -Tag 'failed'
                $exception = New-Object System.Data.DataException("Query with filter $filter against Microsoft Graph failed. Error: $_")
                $errorID = 'QueryWithFilterFailed'
                $category = [System.Management.Automation.ErrorCategory]::NotSpecified
                $recordObject = New-Object System.Management.Automation.ErrorRecord($exception, $errorID, $category, $Cmdlet)
                $cmdlet.ThrowTerminatingError($recordObject)
            }
            
            switch ($resource.Count) {
                0 {
                    if ($definition.present) {                    
                        $result = New-TestResult @result -ActionType "Create"
                    }
                    else {                    
                        $result = New-TestResult @result -ActionType "NoActionRequired"
                    }
                }
                1 {
                    $result["GraphResource"] = $resource
                    if ($definition.present) {
                        $changes = @()
                        foreach ($property in ($definition.Properties() | Where-Object {$_ -notin "present", "sourceConfig", "accessPackage", "oldNames"})) {
                            $change = [PSCustomObject] @{
                                Property = $property                                        
                                Actions = $null
                            }

                            switch ($property) {
                                {$_ -in "accessReviewSettings", "requestApprovalSettings", "requestorSettings"} {
                                    $needUpdate = $false
                                    foreach ($key in $definition.$property.Keys) {
                                        switch ($key) {
                                            "approvalStages" {
                                                "primaryApprovers", "escalationApprovers" | Where-Object { $_ -in $definition.$property.$key.Keys } | Foreach-Object {                                
                                                    if (Check-UserSetRequiresUpdate -Reference $resource.$property.$key.$_ -Difference $definition.$property.$key.$_ -Cmdlet $Cmdlet) {
                                                        $needUpdate = $true
                                                    }
                                                }
                                            }
                                            {$_ -in "reviewers", "allowedRequestors"} {
                                                if (Check-UserSetRequiresUpdate -Reference $resource.$property.$key -Difference $definition.$property.$key -Cmdlet $Cmdlet) {
                                                    $needUpdate = $true
                                                }
                                            }
                                            default {
                                                if ($definition.$property[$key] -ne $resource.$property.$key) {
                                                    $needUpdate = $true
                                                }
                                            }
                                        }
                                    }
                                    if ($needUpdate) { $change.Actions = @{"Set" = $definition.$property} }
                                }
                                default {
                                    if ($definition.$property -ne $resource.$property) {
                                        $change.Actions = @{"Set" = $definition.$property}
                                    }
                                }
                            }
                            if ($change.Actions) {$changes += $change}
                        }
    
                        if ($changes.count -gt 0) { $result = New-TestResult @result -Changes $changes -ActionType "Update"}
                        else { $result = New-TestResult @result -ActionType "NoActionRequired" }
                    }
                    else {
                        $result = New-TestResult @result -ActionType "Delete"
                    }
                }
                default {
                    Write-PSFMessage -Level Warning -String 'TMF.Test.MultipleResourcesError' -StringValues $resourceName, $definition.displayName -Tag 'failed'
                    $exception = New-Object System.Data.DataException("Query returned multiple results. Cannot decide which resource to test.")
                    $errorID = 'MultipleResourcesError'
                    $category = [System.Management.Automation.ErrorCategory]::NotSpecified
                    $recordObject = New-Object System.Management.Automation.ErrorRecord($exception, $errorID, $category, $Cmdlet)
                    $cmdlet.ThrowTerminatingError($recordObject)
                }
            }
            
            $result
        }
    }
}