ParameterBindingException when mocking Get-Package

[nyanhp]

Checklist

• Issue has a meaningful title
• I have searched the existing issues. See all issues
• I have tested using the latest version of Pester. See Installation and update guide.

What is the issue?

Mocking Get-Package results in ParameterBindingException. Get-Package is a compiled cmdlet, so I would assume that Pester should be able to mock it (unlike what happens in #619)

The error, as it appears:

[-] What.Is.Happening Here 66ms (65ms|1ms)
 ParameterBindingException: Parameter set cannot be resolved using the specified named parameters.
 at foo, <No file>:2
 at <ScriptBlock>, D:\tmp\bla.tests.ps1:15

Expected Behavior

The mock should be executed as expected and return "A Package" instead of throwing a ParameterBindingException

Steps To Reproduce

function foo {
    Get-Package -Name ThePackage
}
describe What {

    Context Is {
        BeforeAll {
            Mock -CommandName Get-Package -MockWith { return 'A Package' } -Verifiable -ParameterFilter { $Name -eq 'ThePackage' }
        }

        It 'Happening Here' {
            foo | Should -Be 'A Package'
        }

    }
}

Describe your environment

Pester version : 5.3.3 C:\Program Files\WindowsPowerShell\Modules\Pester\5.3.3\Pester.psm1
PowerShell version : 5.1.22000.653
OS version : Microsoft Windows NT 10.0.22000.0

Possible Solution?

No response

[fflaten]

Thanks for the report. The PackageManagement-module in general is unfortunately problematic due to it's use of dynamic parameters. See #2094

possibly related to #339

[nyanhp]

Thanks @fflaten I missed that issue when searching. I'll just create a function before my tests then and mock that instead :)

[nohwnd]

This is the same underlying bug as #1531: mocking a proxy/cmdlet that has multiple non-mandatory parameter sets (here Get-Package, there Get-PackageSource) fails with ParameterBindingException: Parameter set cannot be resolved. Root cause is shared - Pester generates the mock bootstrap proxy with PositionalBinding=$false, and with no arguments the engine can't pick a default parameter set. I'm consolidating this into #1531 so the fix is tracked in one place. Closing as a duplicate of #1531 - please follow along there.