Provide example of unit test for private function

[NowinskiK]

Because currently the tests like this fail:

Describe "Write-Message" -Tag "UnitTests" {

    BeforeDiscovery {
        $command = Get-Command -Name Write-Message
        $expected = $expectedParams
    }

    Context "Parameter validation" {
        BeforeAll {
            $command = Get-Command -Name Write-Message
            $expected = $expectedParams
        }

        It "Has parameter: <_>" -ForEach $expected {
            $command | Should -HaveParameter $PSItem
        }

        It "Should have exactly the number of expected parameters $($expected.Count)" {
            $hasparms = $command.Parameters.Values.Name
            #$hasparms.Count | Should -BeExactly $expected.Count
            Compare-Object -ReferenceObject $expected -DifferenceObject $hasparms | Should -BeNullOrEmpty
        }
    }
}

[SQLDBAWithABeard]

For internal function testing, the file can be dot-sourced for testing in Pester

For Write-Message, lets phase it out and use PsFramework to make sure that there are no command clashes as many folk will have a custom Write-Message in their session already and this will cause issues