Functions/Test-ShouldProcess.ps1

Function Test-ShouldProcess {
    [CmdletBinding(SupportsShouldProcess, ConfirmImpact='Medium')]
    param()

    Begin {
        Write-Verbose "Beginning $($MyInvocation.Mycommand)"
        if (-not $PSBoundParameters.ContainsKey('Confirm'))
        {
            $ConfirmPreference = $PSCmdlet.SessionState.PSVariable.GetValue('ConfirmPreference')
        }
        if (-not $PSBoundParameters.ContainsKey('WhatIf'))
        {
            $WhatIfPreference = $PSCmdlet.SessionState.PSVariable.GetValue('WhatIfPreference')
        }
    }

    Process
    {
        # Preparation

        if ($PSCmdlet.ShouldProcess("ShouldProcess?"))
        {
            # Critical code
        }

        # Cleanup
    }
}