Add new tests for Get-WinEvent

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

@@ -1,7 +1,66 @@
 Describe 'Get-WinEvent' -Tags "CI" {
+    BeforeAll {
+        if ( ! $IsWindows )
+        {
+            $origDefaults = $PSDefaultParameterValues.Clone()
+            $PSDefaultParameterValues['it:skip'] = $true
+        }
+    }
+    AfterAll {
+        if ( ! $IsWindows ){
+            $global:PSDefaultParameterValues = $origDefaults
+        }
+    }
+    Context "Get-WinEvent ListProvider parameter" {
+        It 'Get-WinEvent can list the providers' {
+            $result = Get-WinEvent -listprovider * -erroraction ignore
+            $result | should not BeNullOrEmpty
+        }
+        It 'Get-WinEvent can get a provider by name' {
+            $providers = Get-WinEvent -listprovider * -erroraction ignore
+            $result = Get-WinEvent -listprovider ($providers[0].name)
+            $result | should not BeNullOrEmpty
+        }
 
+    }
+    Context "Get-WinEvent can retrieve events" {
+        # for this set of tests we need to have a provider which has multiple events
+        BeforeAll {
+            $foundEvents = $false
+            $providers = Get-WinEvent -listprovider * -erroraction ignore
+            foreach($provider in $providers) {
+                $events = Get-WinEvent -provider $provider.name -erroraction ignore
+                if ( $events.Count -gt 2 ) {
+                    $providerForTests = $provider
+                    $foundEvents = $true
+                    break
+                }
+            }
+        }
+        It 'Get-WinEvent can get events from a provider' {
+            # we sample the first 20 results, as this could be very large
+            $results = Get-WinEvent -provider $providerForTests.Name -max 20
+            foreach($event in $results ) {
+                $event.providername | should be $providerForTests.name
+            }
+        }
+        It 'Get-WinEvent can get events via logname' {
+            $results = get-winevent -logname $providerForTests.LogLinks.LogName -MaxEvents 10 
+            $results | should not BeNullOrEmpty
+        }
+        It 'Get-WinEvent can use the simplest of filters' {
+            $filter = @{ ProviderName = $providerForTests.Name }
+            $testEvents = Get-WinEvent -filterhashtable $filter
+            $testEvents.Count | should be $events.Count
+        }
+        It 'Get-WinEvent can use a filter which includes two items' {
+            $filter = @{ ProviderName = $providerForTests.Name; Id = $events[0].Id}
+            $results = Get-WinEvent -filterHashtable $filter
+            $results | Should not BeNullOrEmpty
+        }
+    }
     # 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
+    It 'can query a System log' {
+        Get-WinEvent -LogName System -MaxEvents 1 | Should Not BeNullOrEmpty
     }
 }