add: New private function for csv/xlsx merge

tests/Unit/Private/New-MergedObject.tests.ps1

@@ -0,0 +1,27 @@
+$ProjectPath = "$PSScriptRoot\..\..\.." | Convert-Path
+$ProjectName = ((Get-ChildItem -Path $ProjectPath\*\*.psd1).Where{
+        ($_.Directory.Name -match 'source|src' -or $_.Directory.Name -eq $_.BaseName) -and
+        $(try { Test-ModuleManifest $_.FullName -ErrorAction Stop } catch { $false } )
+    }).BaseName
+
+
+Import-Module $ProjectName
+
+InModuleScope $ProjectName {
+    Describe Get-PrivateFunction {
+        Context 'Default' {
+            BeforeEach {
+                $return = Get-PrivateFunction -PrivateData 'string'
+            }
+
+            It 'Returns a single object' {
+                ($return | Measure-Object).Count | Should -Be 1
+            }
+
+            It 'Returns a string based on the parameter PrivateData' {
+                $return | Should -Be 'string'
+            }
+        }
+    }
+}
+