docs: finalize error handling standard

tests/Unit/Private/Get-PrivateFunction.tests.ps1

@@ -1,31 +0,0 @@
-BeforeAll {
-    $script:dscModuleName = 'M365FoundationsCISReport'
-
-    Import-Module -Name $script:dscModuleName
-}
-
-AfterAll {
-    # Unload the module being tested so that it doesn't impact any other tests.
-    Get-Module -Name $script:dscModuleName -All | Remove-Module -Force
-}
-
-Describe Get-PrivateFunction {
-    Context 'When calling the function with string value' {
-        It 'Should return a single object' {
-            InModuleScope -ModuleName $dscModuleName {
-                $return = Get-PrivateFunction -PrivateData 'string'
-
-                ($return | Measure-Object).Count | Should -Be 1
-            }
-        }
-
-        It 'Should return a string based on the parameter PrivateData' {
-            InModuleScope -ModuleName $dscModuleName {
-                $return = Get-PrivateFunction -PrivateData 'string'
-
-                $return | Should -Be 'string'
-            }
-        }
-    }
-}
-