Update PSVersionTable tests for PSEdition

test/powershell/PSVersionTable.Tests.ps1

@@ -1,11 +1,11 @@
 Describe "PSVersionTable" {
     It "Should have version table entries" {
-        $PSVersionTable.Count | Should BeGreaterThan 6
+        $PSVersionTable.Count | Should Be 8
     }
 
     It "Should have the right version table entries" {
-
         $PSVersionTable.ContainsKey("PSVersion")                 | Should Be True
+        $PSVersionTable.ContainsKey("PSEdition")                 | Should Be True
         $PSVersionTable.ContainsKey("WSManStackVersion")         | Should Be True
         $PSVersionTable.ContainsKey("SerializationVersion")      | Should Be True
         $PSVersionTable.ContainsKey("CLRVersion")                | Should Be True
@@ -14,4 +14,17 @@
         $PSVersionTable.ContainsKey("PSRemotingProtocolVersion") | Should Be True
 
     }
+
+    It "Should have the correct edition" -Skip:(!$IsCore) {
+        $expected =
+        if ($IsLinux -Or $IsOSX) {
+            "Linux"
+        } elseif ($IsWindows) {
+            "Core"
+        } else {
+            throw [PlatformNotSupportedException]
+        }
+
+        $PSVersionTable["PSEdition"] | Should Be $expected
+    }
 }