Mock Invoke-AzRestMethod

[jasnicchr]

Hello. I am attempting and failing to Mock the below command. I would really appreciate some guidance. The command is pulling back a list of Azure AD Group Members, in particular, Service Principal members.

((Invoke-AzRestMethod -Uri "https://graph.microsoft.com/beta/groups/$($Group.id)/members").Content | ConvertFrom-Json).value | Select-Object -Property DisplayName, Id, @{label='OdataType';expression={$_.'@odata.type'}}

My Mock is as follows:
Mock -CommandName Invoke-AzRestMethod -MockWith {} -ModuleName MyModuleName -ParameterFilter {$Uri -eq "https://graph.microsoft.com/beta/groups/$($fakeAADGroup.id)/members"}

The error that I get back is:
ConvertFrom-Json : Cannot bind argument to parameter "InputObject" because it is null.

The error makes complete sense, it is expecting some input from the pipeline but I am unsure how I mock this required input data.

[fflaten]

Run the real Invoke-AzRestMethod against a test-group, save the output, clean/anonymize/simplify it and make your mock return it or something in the same format (-MockWith { "json here" })

[jasnicchr]

Thanks for the reply. I have already attempted your suggestion but unfortunately I received the same error message.

[fflaten]

I noticed now that I missed the call to Content-property in your command. Invoke-AzRestMethod returns a object with some http method, http response code + a Content property with the json. So you need to wrap your mock-json inside object's Content-property. Try: -MockWith { @{ Content = "your valid json here" } }