(#3641) Tests ensuring drive root resolution

This commit adds tests to ensure a source of '.' at the root of a drive
resolves correctly.

Author: corbob

tests/pester-tests/scenarios/localpathsource.Tests.ps1

@@ -0,0 +1,61 @@
+Describe "Actions from the root of a drive" -Tag Scenario {
+        BeforeAll {
+        Initialize-ChocolateyTestInstall
+        Push-Location '\'
+        Invoke-Choco new roottest --version 1.0.0
+        Remove-Item roottest/tools/*.ps1 -ErrorAction SilentlyContinue
+        Invoke-Choco pack roottest/roottest.nuspec
+    }
+
+    AfterAll {
+        Remove-ChocolateyTestInstall
+        Remove-Item roottest, roottest.1.0.0.nupkg -Force -Recurse -ErrorAction SilentlyContinue
+        Pop-Location
+    }
+
+    Context "Searching with <_> '.' source at the root of a drive" -ForEach @('find', 'search') {
+        BeforeAll {
+            $Output = Invoke-Choco $_ --source="'.'"
+        }
+
+        It 'Exits with Success (0)' {
+            $Output.ExitCode | Should -Be 0 -Because $Output.String
+        }
+
+        It 'Does not output message about being unable to parse a source' {
+            $Output.Lines | Should -Not -Contain "Source '.' is unable to be parsed" -Because $Output.String
+        }
+
+        It "Finds the package expected" {
+            $Output.Lines | Should -Contain "roottest 1.0.0" -Because $Output.String
+        }
+    }
+
+    Context "Installing from '.' source using <_> at the root of a drive" -ForEach @( 'install', 'upgrade' ) {
+        BeforeAll {
+            Restore-ChocolateyInstallSnapshot
+            $Output = Invoke-Choco $_ roottest --source="'.'"
+        }
+
+        AfterAll {
+            Remove-ChocolateyInstallSnapshot
+        }
+
+        It 'Exits with Success (0)' {
+            $Output.ExitCode | Should -Be 0 -Because $Output.String
+        }
+
+        It 'Does not output message about being unable to parse a source' {
+            $Output.Lines | Should -Not -Contain "Source '.' is unable to be parsed" -Because $Output.String
+        }
+
+        It "Finds the package expected" {
+            $Output.Lines | Should -Contain "roottest v1.0.0" -Because $Output.String
+        }
+
+        It "Successfully updates the package" {
+            $Action = $_.TrimEnd('e') + 'ed'
+            $Output.Lines | Should -Contain "Chocolatey $Action 1/1 packages." -Because $Output.String
+        }
+    }
+}