Added Get-OperatingSystem and Get-TempDirectory to fix TestDrive on P…

…SCore

Functions/TestDrive.Tests.ps1

@@ -1,6 +1,13 @@
 Set-StrictMode -Version Latest
 
-$tempPath = (Get-Item $env:temp).FullName
+if ($PSVersionTable.PSVersion.Major -lt 6 -or $IsWindows)
+{
+    $tempPath = $env:TEMP
+}
+else
+{
+    $tempPath = '/tmp'
+}
 
 Describe "Setup" {
     It "returns a location that is in a temp area" {

Functions/TestDrive.ps1

@@ -39,7 +39,8 @@ function Clear-TestDrive ([String[]]$Exclude) {
 function New-RandomTempDirectory {
     do
     {
-        $Path = & $SafeCommands['Join-Path'] -Path $env:TEMP -ChildPath ([Guid]::NewGuid())
+        $tempPath = Get-TempDirectory
+        $Path = & $SafeCommands['Join-Path'] -Path $tempPath -ChildPath ([Guid]::NewGuid())
     } until (-not (& $SafeCommands['Test-Path'] -Path $Path ))
 
     & $SafeCommands['New-Item'] -ItemType Container -Path $Path

Pester.Tests.ps1

@@ -284,4 +284,36 @@ InModuleScope Pester {
             }
         }
     }
+
+    describe 'Get-OperatingSystem' {
+
+        it 'returns Windows' {
+
+            Get-OperatingSystem | should be 'Windows'
+        }
+    }
+
+    describe 'Get-TempDirectory' {
+
+        it 'returns the correct temp directory for Windows' {
+            mock 'Get-OperatingSystem' {
+                'Windows'
+            }
+            Get-TempDirectory | should be $env:TEMP
+        }
+
+        it 'returns the correct temp directory for MacOS' {
+            mock 'Get-OperatingSystem' {
+                'MacOS'
+            }
+            Get-TempDirectory | should be '/tmp'
+        }
+
+        it 'returns the correct temp directory for Linux' {
+            mock 'Get-OperatingSystem' {
+                'Linux'
+            }
+            Get-TempDirectory | should be '/tmp'
+        }
+    }
 }

Pester.psm1

@@ -722,6 +722,41 @@ function Get-ScriptBlockScope
     [scriptblock].GetProperty('SessionStateInternal', $flags).GetValue($ScriptBlock, $null)
 }
 
+function Get-OperatingSystem
+{
+    [CmdletBinding()]
+    param()
+
+    ## Prior to v6, PowerShell was solely Windows. In v6, the $IsWindows var was introduced.
+    if ($PSVersionTable.PSVersion.Major -lt 6 -or $IsWindows)
+    {
+        'Windows'
+    } 
+    elseif ($IsOSX)
+    {
+        'OSX'
+    }
+    elseif ($IsLinux)
+    {
+        'Linux'
+    }
+}
+
+function Get-TempDirectory
+{
+    [CmdletBinding()]
+    param()
+
+    if ((Get-OperatingSystem) -eq 'Windows')
+    {
+        $env:TEMP
+    }
+    else
+    {
+        '/tmp'
+    }
+}
+
 function SafeGetCommand
 {
     <#