Describe 'Domain Controllers' {

    Context 'Replication Link Status' {

        $results = repadmin /showrepl * /csv | ConvertFrom-Csv # Get the results of all replications between all DCs

        $groups = $results | Group-Object -Property 'Source DSA' # Group the results by the source DC

        foreach ($sourcedsa in $groups) {
            # Create a context for each source DC

            Context "Source DSA = $($sourcedsa.Name)" {

                $targets = $sourcedsa.Group # Assign the value of the groupings to another var since .Group doesn't implement IComparable

                $targetdsa = $targets | Group-Object -Property 'Destination DSA' # Now group within this source DC by the destination DC (pulling naming contexts per source and destination together)

                foreach ($target in $targetdsa ) {
                    # Create a context for each destination DSA

                    Context "Target DSA = $($target.Name)" {

                        foreach ($entry in $target.Group) {
                            # List out the results and check each naming context for failures

                            It "$($entry.'Naming Context') - should have zero replication failures" {
                                $entry.'Number of failures' | Should Be 0
                            }
                        }
                    }
                }
            }
        }
    }
}