Mocking .NET Objects

Hi,

Does anyone know the requirements for mocking .NET objects? Using New-MockObject works ok for something like System.Diagnostics.Process but not for System.Data.DataRow.

The mock appears to work but using GetType gives the error "The following exception occurred while retrieving member “GetType”: “Object reference not set to an instance of an object.”

Wanted to try and use the reflection method mentioned here https://github.com/pester/Pester/issues/640

New-MockObject just creates an object template of sorts but, as you have seen, is not a true object. I use New-MockObject all the time and if I need a method or property like GetType() I’ll do this:

$obj = New-MockObject -Type 'System.Data.DataRow'
$obj | Add-Member -MemberType ScriptMethod -Name 'GetType' -Force -Value { 'sometthinghere' }

Doesn’t work for me, the Add-Member still fails with “Object reference not set to an instance of an object”.

Was thinking maybe that type lacks a public constructor or the New-MockObject function is not instantiating the class in a way that makes it usable?