Remove / and /tmp references

test/powershell/Export-Alias.Tests.ps1

@@ -1,10 +1,10 @@
 $here = Split-Path -Parent $MyInvocation.MyCommand.Path
-. $here/Test-Common.ps1
+. (Join-Path -Path $here -ChildPath Test-Common.ps1)
 
 Describe "Export-Alias" {
-    $testAliasDirectory = "$(GetTempDir)/ExportAliasTestDirectory"
+    $testAliasDirectory = Join-Path -Path $(GetTempDir) -ChildPath ExportAliasTestDirectory
     $testAliases        = "TestAliases"
-    $fulltestpath       = "$($testAliasDirectory)/$($testAliases)"
+    $fulltestpath       = Join-Path -Path $($testAliasDirectory) -ChildPath $($testAliases)
 
     BeforeEach {
         New-Item -Path $testAliasDirectory -ItemType Directory -Force