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

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
+    }
+}