(chocolatey#2815) Add Pester tests for choco feature get

This commit adds new end to end tests for the new choco feature get
command so ensure that it works as expected. This includes running both
choco feature and choco features, as well as running with --name and
without.

tests/chocolatey-tests/commands/choco-feature.Tests.ps1

@@ -19,6 +19,9 @@ Describe "choco <_>" -ForEach $Command -Tag Chocolatey, FeatureCommand {
         Initialize-ChocolateyTestInstall
 
         New-ChocolateyInstallSnapshot
+
+        $InitialConfiguration = ([xml](Get-Content $env:ChocolateyInstall\config\chocolatey.config)).chocolatey
+        $expectedLicenseHeader = Get-ExpectedChocolateyHeader
     }
 
     AfterAll {
@@ -214,6 +217,58 @@ Describe "choco <_>" -ForEach $Command -Tag Chocolatey, FeatureCommand {
         }
     }
 
+    Context "Getting a feature (<_.Name>)" -ForEach $CurrentFeatures {
+        BeforeAll {
+            $Output = Invoke-Choco feature get $_.Name
+        }
+
+        It "Exits with Success (0)" {
+            $Output.ExitCode | Should -Be 0 -Because $Output.String
+        }
+
+        It "Displays chocolatey name with version" {
+            $Output.Lines | Should -Contain $expectedLicenseHeader
+        }
+
+        It "Displays value of feature" {
+            $expectedResult = If ($InitialConfiguration.SelectSingleNode("//features/feature[@name='$($_.Name)']").enabled -eq "true" ) { "Enabled" } Else { "Disabled" }
+            $Output.Lines | Should -Contain $expectedResult -Because $Output.String
+        }
+    }
+
+    Context "Getting a feature by argument (<_.Name>)" -ForEach $CurrentFeatures {
+        BeforeAll {
+            $Output = Invoke-Choco feature get --name $_.Name
+        }
+
+        It "Exits with Success (0)" {
+            $Output.ExitCode | Should -Be 0 -Because $Output.String
+        }
+
+        It "Displays chocolatey name with version" {
+            $Output.Lines | Should -Contain $expectedLicenseHeader
+        }
+
+        It "Displays value of feature" {
+            $expectedResult = If ($InitialConfiguration.SelectSingleNode("//features/feature[@name='$($_.Name)']").enabled -eq "true" ) { "Enabled" } Else { "Disabled" }
+            $Output.Lines | Should -Contain $expectedResult -Because $Output.String
+        }
+    }
+
+    Context "Getting a feature that doesn't exist" {
+        BeforeAll {
+            $Output = Invoke-Choco feature get noFeatureValue
+        }
+
+        It "Exits with failure (1)" {
+            $Output.ExitCode | Should -Be 1 -Because $Output.String
+        }
+
+        It "Outputs an error indicating that there's no feature by that name" {
+            $Output.Lines | Should -Contain "No feature value by the name 'noFeatureValue'"
+        }
+    }
+
     # This needs to be the last test in this block, to ensure NuGet configurations aren't being created.
     Test-NuGetPaths
 }