refactored the supporting file list that gets copied so it can be tested

InstallModule.ps1

@@ -18,48 +18,7 @@ Begin {
     Try {
         Write-Verbose "$ModuleName module installation started"
 
-        $Files = @(
-            '*.dll',
-            '*.psd1',
-            '*.psm1',
-            'AddConditionalFormatting.ps1',
-            'Charting.ps1',
-            'ColorCompletion.ps1',
-            'Compare-Worksheet.ps1',
-            'ConvertFromExcelData.ps1',
-            'ConvertFromExcelToSQLInsert.ps1',
-            'ConvertExcelToImageFile.ps1',
-            'ConvertToExcelXlsx.ps1',
-            'Copy-ExcelWorkSheet.ps1',
-            'Export-Charts.ps1',
-            'Export-Excel.ps1',
-            'Export-ExcelSheet.ps1',
-            'Get-ExcelColumnName.ps1',
-            'Get-ExcelSheetInfo.ps1',
-            'Get-ExcelWorkbookInfo.ps1',
-            'Get-HtmlTable.ps1',
-            'Get-Range.ps1',
-            'Get-XYRange.ps1',
-            'Import-Html.ps1',
-            'InferData.ps1',
-            'Invoke-Sum.ps1',
-            'Join-Worksheet.ps1',
-            'Merge-Worksheet.ps1',
-            'New-ConditionalFormattingIconSet.ps1',
-            'New-ConditionalText.ps1',
-            'New-ExcelChart.ps1',
-            'New-PSItem.ps1',
-            'Open-ExcelPackage.ps1',
-            'Pivot.ps1',
-            'Plot.ps1',
-            'Send-SQLDataToExcel.ps1',
-            'Set-CellStyle.ps1',
-            'Set-Column.ps1',
-            'Set-Row.ps1',
-            'SetFormat.ps1',
-            'TrackingUtils.ps1',
-            'Update-FirstObjectProperties.ps1'
-        )
+        $Files = Get-Content $PSScriptRoot\filelist.txt
     }
     Catch {
         throw "Failed installing the module '$ModuleName': $_"