Add tests for settings discovery

Author: Kapil Borle

Tests/Engine/Settings.tests.ps1

@@ -0,0 +1,31 @@
+if (!(Get-Module PSScriptAnalyzer))
+{
+	Import-Module PSScriptAnalyzer
+}
+
+$directory = Split-Path $MyInvocation.MyCommand.Path
+Describe "Settings Precedence" {
+    $settingsTestDirectory = [System.IO.Path]::Combine($directory, "SettingsTest")
+	$project1Root = [System.IO.Path]::Combine($settingsTestDirectory, "Project1")
+    $project2Root = [System.IO.Path]::Combine($settingsTestDirectory, "Project2")
+    Context "settings object is explicit" {
+        It "runs rules from the explicit setting file" {
+              $settingsFilepath = [System.IO.Path]::Combine($project1Root, "ExplicitSettings.psd1")
+              $violations = Invoke-ScriptAnalyzer -Path $project1Root -Settings $settingsFilepath -Recurse
+              $violations.Count | Should Be 1
+              $violations[0].RuleName | Should Be "PSAvoidUsingWriteHost"
+        }
+	}
+	Context "settings file is implicit" {
+        It "runs rules from the implicit setting file" {
+              $violations = Invoke-ScriptAnalyzer -Path $project1Root -Recurse
+              $violations.Count | Should Be 1
+              $violations[0].RuleName | Should Be "PSAvoidUsingCmdletAliases"
+        }
+
+        It "cannot find file if not named PSScriptAnalyzerSettings.psd1" {
+              $violations = Invoke-ScriptAnalyzer -Path $project2Root -Recurse
+              $violations.Count | Should Be 2
+        }
+	}
+}

Tests/Engine/SettingsTest/Project1/ExplicitSettings.psd1

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+@{
+    "IncludeRules" = @("PSAvoidUsingWriteHost")
+}

Tests/Engine/SettingsTest/Project1/PSScriptAnalyzerSettings.psd1

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+@{
+    "IncludeRules" = @("PSAvoidUsingCmdletAliases")
+}

Tests/Engine/SettingsTest/Project1/project1.ps1

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+gci
+Write-Host "Do not use write-host"

Tests/Engine/SettingsTest/Project2/project2.ps1

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+gci
+Write-Host "Do not use write-host"