2-RemoveAvailabilityGroup.ps1

<#
.EXAMPLE
This example shows how to ensure that the Availability Group 'TestAG' does not exist.
#>

$ConfigurationData = @{
    AllNodes = @(
        @{
            NodeName     = '*'
            InstanceName = 'MSSQLSERVER'
        },

        @{
            NodeName = 'SP23-VM-SQL1'
            Role     = 'PrimaryReplica'
        }
    )
}

Configuration Example
{
    param(
        [Parameter(Mandatory = $true)]
        [System.Management.Automation.PSCredential]
        $SqlAdministratorCredential
    )

    Import-DscResource -ModuleName SqlServerDsc

    Node $AllNodes.NodeName {
        if ( $Node.Role -eq 'PrimaryReplica' )
        {
            # Create the availability group on the instance tagged as the primary replica
            SqlAG RemoveTestAG
            {
                Ensure               = 'Absent'
                Name                 = 'TestAG'
                InstanceName         = $Node.InstanceName
                ServerName           = $Node.NodeName
                PsDscRunAsCredential = $SqlAdministratorCredential
            }
        }
    }
}