Mocking Write-Warning

gistfile1.ps1

function DoSomething 
{
    Write-Warning "problem with the server certificate"
}

Describe 'Test warning' {
    Mock Write-Warning { $Message }
    
    It 'Writes warning' {

        DoSomething

        Assert-MockCalled Write-Warning -Exactly 1 -ParameterFilter { 
            $Message -eq  "problem with the server certificate"}
    }
}