Mastering Windows PowerShell Scripting - Third Edition

Mocking non-local commands

In some cases, it is desirable to mock commands that are not available on the test system. One possible approach in these circumstances is to create a function that reflects the command first, then mock the function.

For example, consider a function that creates and configures a DNS zone with a predefined set of parameter values:

function New-DnsZone {    [CmdletBinding()]    param (        [Parameter(Mandatory)]        [String]$Name    )    $params = @{        Name             = $Name        DynamicUpdate    = 'Secure'        ReplicationScope = 'Domain'    }    if (-not (Get-DnsServerZone $Name -ErrorAction SilentlyContinue)) {        Add-DnsServerPrimaryZone @params    }}

It may not be desirable to install the DNS module on a development system when testing the script. To mock and verify ...