Add a simple test for Get-WinEvent on windows (Core + Full)

test/fullclr/PowerShellGithubDev.Tests.ps1

@@ -122,6 +122,20 @@ try
                     Remove-Module -ErrorAction SilentlyContinue CimCmdlets
                 }
             }
+
+            It 'loads Microsoft.PowerShell.Diagnostics' {
+                try
+                {
+                    Import-Module Microsoft.PowerShell.Diagnostics -ErrorAction Stop
+                    Get-WinEvent -LogName System -MaxEvents 1 | Should Not Be $null
+                    [Microsoft.PowerShell.Commands.GetWinEventCommand].Assembly.Location | Should Be (
+                        Join-Path $env:DEVPATH Microsoft.PowerShell.Commands.Diagnostics.dll)
+                }
+                finally
+                {
+                    Remove-Module -ErrorAction SilentlyContinue Microsoft.PowerShell.Diagnostics
+                }
+            }
         }
     }    
 

test/powershell/Modules/Microsoft.PowerShell.Diagnostics/Get-WinEvent.Tests.ps1

@@ -0,0 +1,7 @@
+Describe 'Get-WinEvent' {
+
+    # Get-WinEvent works only on windows
+    It 'can query a System log' -Skip:(-not $IsWindows) {
+        Get-WinEvent -LogName System -MaxEvents 1 | Should Not Be $null
+    }
+}