diff --git a/Export-StocksToExcel.ps1 b/Export-StocksToExcel.ps1
index bf3672f..4785e0b 100644
--- a/Export-StocksToExcel.ps1
+++ b/Export-StocksToExcel.ps1
@@ -5,7 +5,7 @@
         $measure = "Open"
     )
 
-    $xl = "$env:TEMP\Stocks.xlsx"
+    $xl = Join-Path ([IO.Path]::GetTempPath()) 'Stocks.xlsx'
 
     Remove-Item $xl -ErrorAction SilentlyContinue
 
diff --git a/__tests__/AddTrendlinesToAChart.tests.ps1 b/__tests__/AddTrendlinesToAChart.tests.ps1
index 18bf7e4..5269a76 100644
--- a/__tests__/AddTrendlinesToAChart.tests.ps1
+++ b/__tests__/AddTrendlinesToAChart.tests.ps1
@@ -20,7 +20,7 @@ South,avocado,73
     }
 
     BeforeEach {
-        $xlfile = "$env:TEMP\trendLine.xlsx"
+        $xlfile = "TestDrive:\trendLine.xlsx"
         Remove-Item $xlfile -ErrorAction SilentlyContinue
     }
 
diff --git a/__tests__/Compare-WorkSheet.tests.ps1 b/__tests__/Compare-WorkSheet.tests.ps1
index a8114e4..bd01b55 100644
--- a/__tests__/Compare-WorkSheet.tests.ps1
+++ b/__tests__/Compare-WorkSheet.tests.ps1
@@ -5,9 +5,9 @@ else                                       {Add-Type -AssemblyName System.Window
 Describe "Compare Worksheet" {
     Context "Simple comparison output" {
         BeforeAll {
-            Remove-Item -Path  "$env:temp\server*.xlsx"
+            Remove-Item -Path  "TestDrive:\server*.xlsx"
             [System.Collections.ArrayList]$s = get-service | Select-Object -first 25 -Property Name, RequiredServices, CanPauseAndContinue, CanShutdown, CanStop, DisplayName, DependentServices, MachineName
-            $s | Export-Excel -Path $env:temp\server1.xlsx
+            $s | Export-Excel -Path TestDrive:\server1.xlsx
             #$s is a zero based array, excel rows are 1 based and excel has a header row so Excel rows will be 2 + index in $s
             $row4Displayname  = $s[2].DisplayName
             $s[2].DisplayName = "Changed from the orginal"
@@ -17,9 +17,9 @@ Describe "Compare Worksheet" {
             $s.Insert(3,$d)
             $row6Name = $s[5].name
             $s.RemoveAt(5)
-            $s | Export-Excel -Path $env:temp\server2.xlsx
+            $s | Export-Excel -Path TestDrive:\server2.xlsx
             #Assume default worksheet name, (sheet1) and column header for key ("name")
-            $comp = compare-WorkSheet "$env:temp\server1.xlsx" "$env:temp\server2.xlsx" | Sort-Object -Property _row, _file
+            $comp = compare-WorkSheet "TestDrive:\Server1.xlsx" "TestDrive:\Server2.xlsx" | Sort-Object -Property _row, _file
         }
         it "Found the right number of differences                                                  " {
             $comp                                                         | should not beNullOrEmpty
@@ -55,13 +55,13 @@ Describe "Compare Worksheet" {
                 $ModulePath = (Get-Command -Name 'Compare-WorkSheet').Module.Path
                 $PowerShellExec = if ($PSEdition -eq 'Core') {'pwsh.exe'} else {'powershell.exe'}
                 $PowerShellPath = Join-Path -Path $PSHOME -ChildPath $PowerShellExec
-                . $PowerShellPath -Command ("Import-Module $ModulePath; " + '$null = Compare-WorkSheet "$env:temp\server1.xlsx" "$env:temp\server2.xlsx" -BackgroundColor ([System.Drawing.Color]::LightGreen) -GridView; Start-Sleep -sec 5')
+                . $PowerShellPath -Command ("Import-Module $ModulePath; " + '$null = Compare-WorkSheet "TestDrive:\Server1.xlsx" "TestDrive:\Server2.xlsx" -BackgroundColor ([System.Drawing.Color]::LightGreen) -GridView; Start-Sleep -sec 5')
             }
             else {
-                $null = Compare-WorkSheet "$env:temp\server1.xlsx" "$env:temp\server2.xlsx" -BackgroundColor ([System.Drawing.Color]::LightGreen) -GridView:$useGrid
+                $null = Compare-WorkSheet "TestDrive:\Server1.xlsx" "TestDrive:\Server2.xlsx" -BackgroundColor ([System.Drawing.Color]::LightGreen) -GridView:$useGrid
             }
-            $xl1  = Open-ExcelPackage -Path "$env:temp\server1.xlsx"
-            $xl2  = Open-ExcelPackage -Path "$env:temp\server2.xlsx"
+            $xl1  = Open-ExcelPackage -Path "TestDrive:\Server1.xlsx"
+            $xl2  = Open-ExcelPackage -Path "TestDrive:\Server2.xlsx"
             $s1Sheet = $xl1.Workbook.Worksheets[1]
             $s2Sheet = $xl2.Workbook.Worksheets[1]
         }
@@ -85,9 +85,9 @@ Describe "Compare Worksheet" {
 
     Context "Setting the forgound to highlight changed properties" {
         BeforeAll {
-            $null = compare-WorkSheet "$env:temp\server1.xlsx" "$env:temp\server2.xlsx" -AllDataBackgroundColor([System.Drawing.Color]::white) -BackgroundColor ([System.Drawing.Color]::LightGreen)  -FontColor ([System.Drawing.Color]::DarkRed)
-            $xl1  = Open-ExcelPackage -Path "$env:temp\server1.xlsx"
-            $xl2  = Open-ExcelPackage -Path "$env:temp\server2.xlsx"
+            $null = compare-WorkSheet "TestDrive:\Server1.xlsx" "TestDrive:\Server2.xlsx" -AllDataBackgroundColor([System.Drawing.Color]::white) -BackgroundColor ([System.Drawing.Color]::LightGreen)  -FontColor ([System.Drawing.Color]::DarkRed)
+            $xl1  = Open-ExcelPackage -Path "TestDrive:\Server1.xlsx"
+            $xl2  = Open-ExcelPackage -Path "TestDrive:\Server2.xlsx"
             $s1Sheet = $xl1.Workbook.Worksheets[1]
             $s2Sheet = $xl2.Workbook.Worksheets[1]
         }
@@ -116,7 +116,7 @@ Describe "Compare Worksheet" {
         BeforeAll {
             [System.Collections.ArrayList]$s = get-service | Select-Object -first 25 -Property RequiredServices, CanPauseAndContinue, CanShutdown, CanStop,
             DisplayName, DependentServices, MachineName, ServiceName, ServicesDependedOn, ServiceHandle, Status, ServiceType, StartType  -ExcludeProperty Name
-            $s | Export-Excel -Path $env:temp\server1.xlsx  -WorkSheetname Server1
+            $s | Export-Excel -Path TestDrive:\server1.xlsx  -WorkSheetname Server1
             #$s is a zero based array, excel rows are 1 based and excel has a header row so Excel rows will be 2 + index in $s
             $row4Displayname  = $s[2].DisplayName
             $s[2].DisplayName = "Changed from the orginal"
@@ -128,11 +128,11 @@ Describe "Compare Worksheet" {
             $s.RemoveAt(5)
             $s[10].ServiceType = "Changed should not matter"
 
-            $s | Select-Object -Property ServiceName, DisplayName, StartType, ServiceType | Export-Excel -Path $env:temp\server2.xlsx -WorkSheetname server2
+            $s | Select-Object -Property ServiceName, DisplayName, StartType, ServiceType | Export-Excel -Path TestDrive:\server2.xlsx -WorkSheetname server2
             #Assume default worksheet name, (sheet1) and column header for key ("name")
-            $comp = compare-WorkSheet "$env:temp\server1.xlsx" "$env:temp\server2.xlsx" -WorkSheetName Server1,Server2 -Key ServiceName -Property DisplayName,StartType -AllDataBackgroundColor ([System.Drawing.Color]::AliceBlue) -BackgroundColor ([System.Drawing.Color]::White) -FontColor ([System.Drawing.Color]::Red)   | Sort-Object _row,_file
-            $xl1  = Open-ExcelPackage -Path "$env:temp\server1.xlsx"
-            $xl2  = Open-ExcelPackage -Path "$env:temp\server2.xlsx"
+            $comp = compare-WorkSheet "TestDrive:\Server1.xlsx" "TestDrive:\Server2.xlsx" -WorkSheetName Server1,Server2 -Key ServiceName -Property DisplayName,StartType -AllDataBackgroundColor ([System.Drawing.Color]::AliceBlue) -BackgroundColor ([System.Drawing.Color]::White) -FontColor ([System.Drawing.Color]::Red)   | Sort-Object _row,_file
+            $xl1  = Open-ExcelPackage -Path "TestDrive:\Server1.xlsx"
+            $xl2  = Open-ExcelPackage -Path "TestDrive:\Server2.xlsx"
             $s1Sheet = $xl1.Workbook.Worksheets["server1"]
             $s2Sheet = $xl2.Workbook.Worksheets["server2"]
         }
@@ -188,10 +188,10 @@ Describe "Compare Worksheet" {
 Describe "Merge Worksheet" {
     Context "Merge with 3 properties" {
         BeforeAll {
-            Remove-Item -Path  "$env:temp\server*.xlsx" , "$env:temp\combined*.xlsx" -ErrorAction SilentlyContinue
+            Remove-Item -Path  "TestDrive:\server*.xlsx" , "TestDrive:\Combined*.xlsx" -ErrorAction SilentlyContinue
             [System.Collections.ArrayList]$s = get-service | Select-Object -first 25 -Property *
 
-            $s | Export-Excel -Path $env:temp\server1.xlsx
+            $s | Export-Excel -Path TestDrive:\server1.xlsx
 
             #$s is a zero based array, excel rows are 1 based and excel has a header row so Excel rows will be 2 + index in $s
             $s[2].DisplayName = "Changed from the orginal"
@@ -203,10 +203,10 @@ Describe "Merge Worksheet" {
 
             $s.RemoveAt(5)
 
-            $s | Export-Excel -Path $env:temp\server2.xlsx
+            $s | Export-Excel -Path TestDrive:\server2.xlsx
             #Assume default worksheet name, (sheet1) and column header for key ("name")
-            Merge-Worksheet -Referencefile "$env:temp\server1.xlsx" -Differencefile  "$env:temp\server2.xlsx" -OutputFile  "$env:temp\combined1.xlsx"  -Property name,displayname,startType -Key name
-            $excel = Open-ExcelPackage -Path "$env:temp\combined1.xlsx"
+            Merge-Worksheet -Referencefile "TestDrive:\server1.xlsx" -Differencefile  "TestDrive:\Server2.xlsx" -OutputFile  "TestDrive:\combined1.xlsx"  -Property name,displayname,startType -Key name
+            $excel = Open-ExcelPackage -Path "TestDrive:\combined1.xlsx"
             $ws    = $excel.Workbook.Worksheets["sheet1"]
         }
         it "Created a worksheet with the correct headings                                          " {
@@ -247,16 +247,16 @@ Describe "Merge Worksheet" {
     }
     Context "Wider data set"    {
         it "Coped with columns beyond Z in the Output sheet                                        " {
-            { Merge-Worksheet -Referencefile "$env:temp\server1.xlsx" -Differencefile  "$env:temp\server2.xlsx" -OutputFile  "$env:temp\combined2.xlsx"  }           | Should not throw
+            { Merge-Worksheet -Referencefile "TestDrive:\server1.xlsx" -Differencefile  "TestDrive:\Server2.xlsx" -OutputFile  "TestDrive:\combined2.xlsx"  }           | Should not throw
         }
     }
 }
 Describe "Merge Multiple sheets" {
     Context "Merge 3 sheets with 3 properties" {
         BeforeAll {
-            Remove-Item -Path  "$env:temp\server*.xlsx" , "$env:temp\combined*.xlsx" -ErrorAction SilentlyContinue
+            Remove-Item -Path  "TestDrive:\server*.xlsx" , "TestDrive:\Combined*.xlsx" -ErrorAction SilentlyContinue
             [System.Collections.ArrayList]$s = get-service | Select-Object -first 25 -Property Name,DisplayName,StartType
-            $s | Export-Excel -Path $env:temp\server1.xlsx
+            $s | Export-Excel -Path TestDrive:\server1.xlsx
 
             #$s is a zero based array, excel rows are 1 based and excel has a header row so Excel rows will be 2 + index in $s
             $row4Displayname  = $s[2].DisplayName
@@ -269,7 +269,7 @@ Describe "Merge Multiple sheets" {
 
             $s.RemoveAt(5)
 
-            $s | Export-Excel -Path $env:temp\server2.xlsx
+            $s | Export-Excel -Path TestDrive:\server2.xlsx
 
             $s[2].displayname = $row4Displayname
 
@@ -279,10 +279,10 @@ Describe "Merge Multiple sheets" {
             $s.Insert(6,$d)
             $s.RemoveAt(8)
 
-            $s | Export-Excel -Path $env:temp\server3.xlsx
+            $s | Export-Excel -Path TestDrive:\server3.xlsx
 
-            Merge-MultipleSheets -Path "$env:temp\server1.xlsx", "$env:temp\server2.xlsx","$env:temp\server3.xlsx" -OutputFile "$env:temp\combined3.xlsx"  -Property name,displayname,startType -Key name
-            $excel = Open-ExcelPackage -Path "$env:temp\combined3.xlsx"
+            Merge-MultipleSheets -Path "TestDrive:\server1.xlsx", "TestDrive:\Server2.xlsx","TestDrive:\Server3.xlsx" -OutputFile "TestDrive:\combined3.xlsx"  -Property name,displayname,startType -Key name
+            $excel = Open-ExcelPackage -Path "TestDrive:\combined3.xlsx"
             $ws    = $excel.Workbook.Worksheets["sheet1"]
 
         }
diff --git a/__tests__/ConvertFromExcelToSQLInsert.tests.ps1 b/__tests__/ConvertFromExcelToSQLInsert.tests.ps1
index b5b13f9..d506fa9 100644
--- a/__tests__/ConvertFromExcelToSQLInsert.tests.ps1
+++ b/__tests__/ConvertFromExcelToSQLInsert.tests.ps1
@@ -1,6 +1,6 @@
 #Import-Module $PSScriptRoot\..\ImportExcel.psd1 -Force
 
-$xlFile = "$env:TEMP\testSQL.xlsx"
+$xlFile = "TestDrive:\testSQL.xlsx"
 
 Describe "ConvertFrom-ExcelToSQLInsert" {
 
diff --git a/__tests__/Copy-ExcelWorksheet.Tests.ps1 b/__tests__/Copy-ExcelWorksheet.Tests.ps1
index 04c9809..b2d9bf0 100644
--- a/__tests__/Copy-ExcelWorksheet.Tests.ps1
+++ b/__tests__/Copy-ExcelWorksheet.Tests.ps1
@@ -1,8 +1,5 @@
-if ($PSVersionTable.os -and $PSVersionTable.os -notMatch 'Windows' ) {return}   #Currently this test outputs windows services so only run on Windows.
-if (-not $env:TEMP) {$env:TEMP = [IO.Path]::GetTempPath() -replace "/$","" }
-
-$path1 = "$env:TEMP\Test1.xlsx"
-$path2 = "$env:TEMP\Test2.xlsx"
+$path1 = "TestDrive:\Test1.xlsx"
+$path2 = "TestDrive:\Test2.xlsx"
 Remove-item -Path $path1, $path2  -ErrorAction SilentlyContinue
 
 $ProcRange = Get-Process | Export-Excel $path1 -DisplayPropertySet -WorkSheetname Processes -ReturnRange
@@ -91,8 +88,8 @@ Describe "Copy-Worksheet" {
 
     Context "Copy worksheet should close all files" {
         BeforeAll {
-            $xlfile = "$env:TEMP\reports.xlsx"
-            $xlfileArchive = "$env:TEMP\reportsArchive.xlsx"
+            $xlfile = "TestDrive:\reports.xlsx"
+            $xlfileArchive = "TestDrive:\reportsArchive.xlsx"
 
             Remove-Item $xlfile -ErrorAction SilentlyContinue
             Remove-Item $xlfileArchive -ErrorAction SilentlyContinue
@@ -119,8 +116,8 @@ Describe "Copy-Worksheet" {
 
     Context "Copy worksheet should support piped input" {
         BeforeAll {
-            $xlfile = "$env:TEMP\reports.xlsx"
-            $xlfileArchive = "$env:TEMP\reportsArchive.xlsx"
+            $xlfile = "TestDrive:\reports.xlsx"
+            $xlfileArchive = "TestDrive:\reportsArchive.xlsx"
 
             Remove-Item $xlfile -ErrorAction SilentlyContinue
             Remove-Item $xlfileArchive -ErrorAction SilentlyContinue
diff --git a/__tests__/Export-Excel.Tests.ps1 b/__tests__/Export-Excel.Tests.ps1
index 964efc4..43fd806 100644
--- a/__tests__/Export-Excel.Tests.ps1
+++ b/__tests__/Export-Excel.Tests.ps1
@@ -8,7 +8,7 @@ if (Get-process -Name Excel,xlim -ErrorAction SilentlyContinue) {    Write-Warni
 Describe ExportExcel {
 
     Context "#Example 1      # Creates and opens a file with the right number of rows and columns" {
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         Remove-item -Path $path -ErrorAction SilentlyContinue
         #Test with a maximum of 100 processes for speed; export all properties, then export smaller subsets.
         $processes = Get-Process | where {$_.StartTime} | Select-Object -first 100 -Property * -excludeProperty  Parent
@@ -70,7 +70,7 @@ Describe ExportExcel {
     }
 
     Context "                # NoAliasOrScriptPropeties -ExcludeProperty and -DisplayPropertySet work" {
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         Remove-item -Path $path  -ErrorAction SilentlyContinue
         $processes = Get-Process | Select-Object -First 100
         $propertyNames = $Processes[0].psobject.properties.where( {$_.MemberType -eq 'Property'}).name
@@ -119,7 +119,7 @@ Describe ExportExcel {
 
     Context "#Example 2      # Exports a list of numbers and applies number format " {
 
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         Remove-item -Path $path -ErrorAction SilentlyContinue
         #testing -ReturnRange switch and applying number format to Formulas as well as values.
         $returnedRange =   @($null, -1, 0, 34, 777, "", -0.5, 119, -0.1, 234, 788,"=A9+A10")   | Export-Excel -NumberFormat '[Blue]$#,##0.00;[Red]-$#,##0.00' -Path $path -ReturnRange
@@ -158,7 +158,7 @@ Describe ExportExcel {
 
     Context "                # Number format parameter" {
         BeforeAll {
-            $path = Join-Path $Env:TEMP "test.xlsx"
+            $path = "TestDrive:\test.xlsx"
             Remove-Item -Path  $path -ErrorAction SilentlyContinue
             1..10  | Export-Excel -Path $path -Numberformat 'Number'
             1..10  | Export-Excel -Path $path -Numberformat 'Percentage' -Append
@@ -181,7 +181,7 @@ Describe ExportExcel {
 
         if ((Get-Culture).NumberFormat.CurrencySymbol -eq "£") {$OtherCurrencySymbol = "$"}
         else {$OtherCurrencySymbol = "£"}
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         $warnVar = $null
         #Test correct export of different data types and number formats; test hyperlinks, test -NoNumberConversion test object is converted to a string with no warnings, test calcuation of formula
         Remove-item -Path $path -ErrorAction SilentlyContinue
@@ -298,7 +298,7 @@ Describe ExportExcel {
 
     Context "#               # Setting cells for different data types with -noHeader" {
 
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         Remove-item -Path $path -ErrorAction SilentlyContinue
         #Test -NoHeader & -NoNumberConversion
         [PSCustOmobject][Ordered]@{
@@ -359,7 +359,7 @@ Describe ExportExcel {
         #Test  New-ConditionalText builds correctly
         $ct = New-ConditionalText -ConditionalType GreaterThan 525 -ConditionalTextColor ([System.Drawing.Color]::DarkRed) -BackgroundColor ([System.Drawing.Color]::LightPink)
 
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         Remove-item -Path $path -ErrorAction SilentlyContinue
         #Test -ConditionalText with a single conditional spec.
         Write-Output 489 668 299 777 860 151 119 497 234 788 | Export-Excel -Path $path -ConditionalText $ct
@@ -389,7 +389,7 @@ Describe ExportExcel {
     Context "#Example 6      # Adding multiple conditional formats using short form syntax. " {
         if ($notwindows)  {Write-warning "Test only runs on Windows" ; return}
         #Test adding mutliple conditional blocks and using the minimal syntax for new-ConditionalText
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         Remove-item -Path $path -ErrorAction SilentlyContinue
 
         #Testing -Passthrough
@@ -451,7 +451,7 @@ Describe ExportExcel {
     }
 
     Context "#Examples 8 & 9 # Adding Pivot tables and charts from parameters" {
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         #Test -passthru and -worksheetName creating a new, named, sheet in an existing file.
         $Script:Procs= Get-Process |  Select-Object -first 20 -Property Name, cpu, pm, handles, company
         if ($Procs.count -lt 20) {Write-warning "Not enough proceses were returned by get-Process to run the test." ; return}
@@ -512,7 +512,7 @@ Describe ExportExcel {
     }
 
     Context "                # Add-Worksheet inserted sheets, moved them correctly, and copied a sheet" {
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         #Test the -CopySource and -Movexxxx parameters for Add-WorkSheet
         $Excel = Open-ExcelPackage  $path
         #At this point Sheets Should be in the order Sheet1, Processes, ProcessesPivotTable
@@ -547,7 +547,7 @@ Describe ExportExcel {
     }
 
     Context "                # Create and append with Start row and Start Column, inc ranges and Pivot table. " {
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         remove-item -Path $path -ErrorAction SilentlyContinue
         #Catch warning
         $warnVar = $null
@@ -599,7 +599,7 @@ Describe ExportExcel {
     }
 
     Context "                # Create and append explicit and auto table and range extension" {
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         #Test -Append automatically extends a table, even when it is not specified in the append command;
         $Script:Procs= Get-process
         if ($Procs.count -lt 20) {Write-warning "Not enough proceses were returned by get-Process to run the test." ; return}
@@ -635,8 +635,7 @@ Describe ExportExcel {
     }
 
     Context "#Example 11     # Create and append with title, inc ranges and Pivot table" {
-        if ($Procs.count -lt 20) {Write-warning "Not enough proceses were returned by get-Process to run the test." ; return}
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         #Test New-PivotTableDefinition builds definition using -Pivotfilter and -PivotTotals options.
         $ptDef = [ordered]@{}
         $ptDef += New-PivotTableDefinition -PivotTableName "PT1" -SourceWorkSheet 'Sheet1' -PivotRows "Status"  -PivotData @{'Status'  = 'Count'} -PivotTotals Columns -PivotFilter "StartType" -IncludePivotChart -ChartType BarClustered3D  -ChartTitle "Services by status" -ChartHeight 512 -ChartWidth 768 -ChartRow 10 -ChartColumn 0 -NoLegend -PivotColumns CanPauseAndContinue
@@ -718,8 +717,8 @@ Describe ExportExcel {
     }
 
     Context "#Example 13     # Formatting and another way to do a pivot.  " {
-        $path = Join-Path $Env:TEMP "test.xlsx"
-        Remove-Item $path -ErrorAction SilentlyContinue
+        $path = "TestDrive:\Test.xlsx"
+        Remove-Item $path
         #Test freezing top row/first column, adding formats and a pivot table - from Add-Pivot table not a specification variable - after the export
         $excel = Get-Process | Select-Object -Property Name, Company, Handles, CPU, PM, NPM, WS | Export-Excel -Path $path -ClearSheet -WorkSheetname "Processes" -FreezeTopRowFirstColumn -PassThru
         $sheet = $excel.Workbook.Worksheets["Processes"]
@@ -800,7 +799,7 @@ Describe ExportExcel {
     }
 
     Context "                # Chart from MultiSeries.ps1 in the Examples\charts Directory" {
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         Remove-Item -Path   $path -ErrorAction SilentlyContinue
         #Test we haven't missed any parameters on New-ChartDefinition which are on add chart or vice versa.
 
@@ -858,7 +857,7 @@ Describe ExportExcel {
     }
 
     Context "                # variation of plot.ps1 from Examples Directory using Add chart outside ExportExcel" {
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         #Test inserting a fomual
         $excel = 0..360 | ForEach-Object {[pscustomobject][ordered]@{x = $_; Sinx = "=Sin(Radians(x)) "}} | Export-Excel -AutoNameRange -Path $path -WorkSheetname SinX -ClearSheet -FreezeFirstColumn -PassThru
         #Test-Add Excel Chart to existing data. Test add Conditional formatting with a formula
@@ -900,7 +899,7 @@ Describe ExportExcel {
     }
 
     Context "                # Quick line chart" {
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\Test.xlsx"
         Remove-Item -Path $path -ErrorAction SilentlyContinue
         #test drawing a chart when data doesn't have a string
         0..360 | ForEach-Object {[pscustomobject][ordered]@{x = $_; Sinx = "=Sin(Radians(x)) "}} | Export-Excel -AutoNameRange  -Path $path -LineChart
@@ -918,7 +917,7 @@ Describe ExportExcel {
     }
 
     Context "                # Quick Pie chart and three icon conditional formating" {
-        $path = Join-Path $Env:TEMP "Pie.xlsx"
+        $path = "TestDrive:\Pie.xlsx"
         Remove-Item -Path $path -ErrorAction SilentlyContinue
         $Script:Procs= Get-Process
         if ($Procs.count -lt 20) {Write-warning "Not enough proceses were returned by get-Process to run the test." ; return}
@@ -957,8 +956,7 @@ Describe ExportExcel {
     }
 
     Context "                # Awkward multiple tables" {
-        if ($notWindows) {Write-warning "Test only runs on Windows" ; return}
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\test.xlsx"
         #Test creating 3 on overlapping tables on the same page. Create rightmost the left most then middle.
         remove-item -Path $path -ErrorAction SilentlyContinue
         $r = Get-ChildItem -path C:\WINDOWS\system32 -File
@@ -993,7 +991,7 @@ Describe ExportExcel {
     }
 
     Context "                # Parameters and ParameterSets" {
-        $Path = join-path $env:TEMP "temp.xlsx"
+        $Path = "TestDrive:\test.xlsx"
         Remove-Item -Path $Path -ErrorAction SilentlyContinue
         $Processes = Get-Process | Select-Object -first 10 -Property Name, cpu, pm, handles, company
 
diff --git a/__tests__/ExtraLongCmd.tests.ps1 b/__tests__/ExtraLongCmd.tests.ps1
index ecb8c17..026043a 100644
--- a/__tests__/ExtraLongCmd.tests.ps1
+++ b/__tests__/ExtraLongCmd.tests.ps1
@@ -1,7 +1,7 @@
 if (-not $env:TEMP) {$env:TEMP = [IO.Path]::GetTempPath() -replace "/$","" }
 
 
-$path = Join-Path $Env:TEMP "test.xlsx"
+$path = "TestDrive:\test.xlsx"
 remove-item -path $path -ErrorAction SilentlyContinue
 ConvertFrom-Csv    @"
 Product, City, Gross, Net
diff --git a/__tests__/First10Races.tests.ps1 b/__tests__/First10Races.tests.ps1
index 3eaa924..02a66ad 100644
--- a/__tests__/First10Races.tests.ps1
+++ b/__tests__/First10Races.tests.ps1
@@ -5,7 +5,7 @@ $dataPath = Join-Path  -Path $scriptPath -ChildPath "First10Races.csv"
 
 Describe "Creating small named ranges with hyperlinks" {
     BeforeAll {
-        $path = Join-Path $Env:TEMP "results.xlsx"
+        $path = "TestDrive:\Results.xlsx"
         Remove-Item -Path $path -ErrorAction SilentlyContinue
         #Read race results, and group by race name : export 1 row to get headers, leaving enough rows aboce to put in a link for each race
         $results = Import-Csv -Path $dataPath |
diff --git a/__tests__/InputItemParameter.tests.ps1 b/__tests__/InputItemParameter.tests.ps1
index 4c02609..6f2243e 100644
--- a/__tests__/InputItemParameter.tests.ps1
+++ b/__tests__/InputItemParameter.tests.ps1
@@ -2,7 +2,7 @@ if (-not $env:TEMP) {$env:TEMP = [IO.Path]::GetTempPath() -replace "/$","" }
 
 Describe "Exporting with -Inputobject" {
     BeforeAll {
-        $path = Join-Path $Env:TEMP "results.xlsx"
+        $path = "TestDrive:\Results.xlsx"
         Remove-Item -Path $path -ErrorAction SilentlyContinue
         #Read race results, and group by race name : export 1 row to get headers, leaving enough rows aboce to put in a link for each race
         $results = ((Get-Process) + (Get-Process -id $PID)) | Select-Object -last  10 -Property Name, cpu, pm, handles, StartTime
diff --git a/__tests__/Join-Worksheet.tests.ps1 b/__tests__/Join-Worksheet.tests.ps1
index c6b87b3..4adb952 100644
--- a/__tests__/Join-Worksheet.tests.ps1
+++ b/__tests__/Join-Worksheet.tests.ps1
@@ -27,7 +27,7 @@ ID,Product,Quantity,Price,Total
 
 Describe "Join Worksheet part 1" {
     BeforeAll {
-        $path = Join-Path $Env:TEMP "test.xlsx"
+        $path = "TestDrive:\test.xlsx"
         Remove-Item -Path $path -ErrorAction SilentlyContinue
         $data1 | Export-Excel -Path $path -WorkSheetname Oxford
         $data2 | Export-Excel -Path $path -WorkSheetname Abingdon
@@ -92,7 +92,7 @@ Describe "Join Worksheet part 1" {
         }
     }
 }
-    $path = Join-Path $Env:TEMP "Test.xlsx"
+    $path = "TestDrive:\Test.xlsx"
     Remove-item -Path $path -ErrorAction SilentlyContinue
 #switched to CIM objects so test runs on V6
 Describe "Join Worksheet part 2" {
diff --git a/__tests__/PasswordProtection.tests.ps1 b/__tests__/PasswordProtection.tests.ps1
index ec4e6a6..fddfca2 100644
--- a/__tests__/PasswordProtection.tests.ps1
+++ b/__tests__/PasswordProtection.tests.ps1
@@ -8,7 +8,7 @@ Describe "Password Support" {
     Context "Password protected sheet" {
         BeforeAll  {
             $password = "YouMustRememberThis"
-            $path = "$env:TEMP\Test.xlsx"
+            $path = "TestDrive:\Test.xlsx"
             Remove-Item $path -ErrorAction SilentlyContinue
             Get-Service | Select-Object -First 10 | Export-excel -password $password -Path $Path -DisplayPropertySet
         }
diff --git a/__tests__/ProtectWorksheet.tests.ps1 b/__tests__/ProtectWorksheet.tests.ps1
index 14c8f65..f763535 100644
--- a/__tests__/ProtectWorksheet.tests.ps1
+++ b/__tests__/ProtectWorksheet.tests.ps1
@@ -1,6 +1,4 @@
-if (-not $env:TEMP) {$env:TEMP = [IO.Path]::GetTempPath() -replace "/$","" }
-
-$path = Join-Path $Env:TEMP "test.xlsx"
+$path = "TestDrive:\test.xlsx"
 Remove-Item -path $path -ErrorAction SilentlyContinue
 $excel = ConvertFrom-Csv    @"
 Product, City, Gross, Net
diff --git a/__tests__/RangePassing.ps1 b/__tests__/RangePassing.ps1
index c26f9d0..e8f04f4 100644
--- a/__tests__/RangePassing.ps1
+++ b/__tests__/RangePassing.ps1
@@ -1,8 +1,4 @@
-
-if (-not $env:TEMP) {$env:TEMP = [IO.Path]::GetTempPath() -replace "/$","" }
-$notWindows =  ($PSVersionTable.os -and $PSVersionTable.os -notMatch 'Windows' )
-
-$path = Join-Path $Env:TEMP "test.xlsx"
+$path = "TestDrive:\test.xlsx"
 describe "Consistent passing of ranges." {
     if ($notWindows) {Write-warning -message "Test uses get-service so only works on Windows" ; return}
     Context "Conditional Formatting"  {
diff --git a/__tests__/Remove-WorkSheet.tests.ps1 b/__tests__/Remove-WorkSheet.tests.ps1
index a720487..b433b45 100644
--- a/__tests__/Remove-WorkSheet.tests.ps1
+++ b/__tests__/Remove-WorkSheet.tests.ps1
@@ -10,7 +10,7 @@ Name,Age
 Jane,10
 John,20
 "@
-            $xlFile1 = Join-Path $Env:TEMP "removeWorsheet1.xlsx"
+            $xlFile1 = "TestDrive:\RemoveWorsheet1.xlsx"
             Remove-Item $xlFile1 -ErrorAction SilentlyContinue
 
             $data | Export-Excel -Path $xlFile1 -WorksheetName Target1
@@ -18,7 +18,7 @@ John,20
             $data | Export-Excel -Path $xlFile1 -WorksheetName Target3
             $data | Export-Excel -Path $xlFile1 -WorksheetName Sheet1
 
-            $xlFile2 = Join-Path $Env:TEMP "removeWorsheet2.xlsx"
+            $xlFile2 = "TestDrive:\RemoveWorsheet2.xlsx"
             Remove-Item $xlFile2 -ErrorAction SilentlyContinue
 
             $data | Export-Excel -Path $xlFile2 -WorksheetName Target1
@@ -65,7 +65,7 @@ John,20
 
         it "Should delete sheet from multiple workbooks".PadRight(87)  {
 
-            Get-ChildItem (Join-Path $Env:TEMP "removeWorsheet*.xlsx") | Remove-WorkSheet
+            Get-ChildItem "TestDrive:\RemoveWorsheet*.xlsx" | Remove-WorkSheet
 
             $actual = Get-ExcelSheetInfo -Path $xlFile1
 
diff --git a/__tests__/Set-Row_Set-Column-SetFormat.tests.ps1 b/__tests__/Set-Row_Set-Column-SetFormat.tests.ps1
index b802895..aa2798d 100644
--- a/__tests__/Set-Row_Set-Column-SetFormat.tests.ps1
+++ b/__tests__/Set-Row_Set-Column-SetFormat.tests.ps1
@@ -1,6 +1,4 @@
-Import-Module $PSScriptRoot\..\ImportExcel.psd1 -Force
-if (-not $env:TEMP) {$env:TEMP = [IO.Path]::GetTempPath() -replace "/$","" }
-$path = Join-Path $Env:TEMP "test.xlsx"
+$path = "TestDrive:\test.xlsx"
 
 $data = ConvertFrom-Csv -InputObject @"
 ID,Product,Quantity,Price
@@ -300,7 +298,7 @@ Describe "Conditional Formatting" {
     }
 
 }
-$path = Join-Path $Env:TEMP "test.xlsx"
+$path = "TestDrive:\test.xlsx"
 $data2 = ConvertFrom-Csv -InputObject @"
 ID,Product,Quantity,Price,Total
 12001,Nails,37,3.99,147.63
@@ -321,7 +319,7 @@ ID,Product,Quantity,Price,Total
 
 Describe "AutoNameRange data with a single property name" {
     BeforeEach {
-        $xlfile = Join-Path $Env:TEMP "testNamedRange.xlsx"
+        $xlfile = "TestDrive:\testNamedRange.xlsx"
         Remove-Item $xlfile -ErrorAction SilentlyContinue
     }
 
diff --git a/__tests__/Validation.tests.ps1 b/__tests__/Validation.tests.ps1
index 7c30e43..62d055d 100644
--- a/__tests__/Validation.tests.ps1
+++ b/__tests__/Validation.tests.ps1
@@ -11,7 +11,7 @@ ID,Product,Quantity,Price
 12011,Crowbar,7,23.48
 "@
 
-$path = Join-Path $Env:TEMP "DataValidation.xlsx"
+$path = "TestDrive:\DataValidation.xlsx"
 
 Describe "Data validation and protection" {
     Context "Data Validation rules" {