Add test to verify formatter implementation

Author: Kapil Borle

Tests/Engine/InvokeFormatter.tests.ps1

@@ -0,0 +1,36 @@
+$directory = Split-Path -Parent $MyInvocation.MyCommand.Path
+$testRootDirectory = Split-Path -Parent $directory
+
+Import-Module PSScriptAnalyzer
+Import-Module (Join-Path $testRootDirectory "PSScriptAnalyzerTestHelper.psm1")
+
+Describe "Invoke-Formatter Cmdlet" {
+    Context "When no settings are given" {
+        It "Should format using default settings" {
+            $def = @'
+function foo
+{
+get-childitem
+$x=1+2
+$hashtable = @{
+property1 = "value"
+    anotherProperty = "another value"
+}
+}
+'@
+            $expected = @'
+function foo {
+    get-childitem
+    $x = 1 + 2
+    $hashtable = @{
+        property1       = "value"
+        anotherProperty = "another value"
+    }
+}
+'@
+
+            Invoke-Formatter -ScriptDefinition $def | Should Be $expected
+        }
+    }
+
+}