Tests for Get-Process Cmdlet for Module and FileVersion parameters (#6272)

* Tests for Get-Process cmdlet.

* Tests for Get-Process run as admin.

* Skipping some Get-Process tests on Linux

* Skip test for -FileVersionInfo parameter for Linux because of the bug that cause the command to hang.

* Add checks for ErrorId in Get-Process tests

* Change one Get-Process test status to pending for MacOs

test/powershell/Modules/Microsoft.PowerShell.Management/Get-Process.Tests.ps1

@@ -4,12 +4,26 @@ Describe "Get-Process for admin" -Tags @('CI', 'RequireAdminOnWindows') {
     It "Should support -IncludeUserName" {
         (Get-Process -Id $pid -IncludeUserName).UserName | Should Match $env:USERNAME
     }
+
+    It "Should support -Module" -Pending:$IsMacOS {
+        $modules = Get-Process -Id $pid -Module
+        $modules.GetType() | Should -BeExactly "System.Object[]"
+        foreach ($module in $modules) {
+            $module.GetType() | Should -BeExactly "System.Diagnostics.ProcessModule"
+        }
+    }
+
+    It "Should support -FileVersionInfo" -Skip:(!$IsWindows) {
+        $pwshVersion = Get-Process -Id $pid -FileVersionInfo
+        $PSVersionTable.PSVersion | Should -Match $pwshVersion.FileVersion
+    }
 }
 
 Describe "Get-Process" -Tags "CI" {
     # These tests are no good, please replace!
     BeforeAll {
         $ps = Get-Process
+        $idleProcessPid = 0
     }
     It "Should return a type of Object[] for Get-Process cmdlet" -Pending:$IsMacOS {
         ,$ps | Should BeOfType "System.Object[]"
@@ -18,6 +32,43 @@ Describe "Get-Process" -Tags "CI" {
     It "Should have not empty Name flags set for Get-Process object" -Pending:$IsMacOS {
         $ps | foreach-object { $_.Name | Should Not BeNullOrEmpty }
     }
+
+    It "Should throw an error for non existing process id." {
+        $randomId = 123456789
+        { Get-Process -Id $randomId -ErrorAction Stop } | Should -Throw -ErrorId "NoProcessFoundForGivenId,Microsoft.PowerShell.Commands.GetProcessCommand"
+    }
+
+    It "Should throw an exception when process id is null." {
+        { Get-Process -id $null } | Should -Throw -ErrorId "ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.GetProcessCommand"
+    }
+
+    It "Should throw an exception when -InputObject parameter is null." {
+        { Get-Process -InputObject $null } | Should -Throw -ErrorId "ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShell.Commands.GetProcessCommand"
+    }
+
+    It "Should not fail to get process name even if it is unavailable." {
+        { (Get-Process -Id $idleProcessPid).Name } | Should -Not -Throw
+    }
+
+    It "Test for process property = Name" {
+        (Get-Process -Id $pid).Name | Should -BeExactly "pwsh"
+    }
+
+    It "Test for process property = Id" {
+        (Get-Process -Id $pid).Id | Should -BeExactly $pid
+    }
+
+    It "Should fail to run Get-Process with -IncludeUserName without admin" -Skip:(!$IsWindows)  {
+        { Get-Process -IncludeUserName } | Should -Throw -ErrorId "IncludeUserNameRequiresElevation,Microsoft.PowerShell.Commands.GetProcessCommand"
+    }
+
+    It "Should fail to run Get-Process with -Module without admin" -Skip:(!$IsWindows) {
+        { Get-Process -Module -ErrorAction Stop } | Should -Throw -ErrorId "CouldNotEnumerateModules,Microsoft.PowerShell.Commands.GetProcessCommand"
+    }
+
+    It "Should fail to run Get-Process with -FileVersionInfo without admin" -Skip:(!$IsWindows) {
+        { Get-Process -FileVersionInfo -ErrorAction Stop } | Should -Throw -ErrorId "CouldNotEnumerateFileVer,Microsoft.PowerShell.Commands.GetProcessCommand"
+    }
 }
 
 Describe "Get-Process Formatting" -Tags "Feature" {