Create a path provider to provide an uniform method for getting the root path.

Author: bclothier

Rubberduck.Parsing/ComReflection/XmlComProjectSerializer.cs

@@ -2,14 +2,19 @@
 using System.IO;
 using System.Runtime.Serialization;
 using System.Xml;
+using Rubberduck.SettingsProvider;
 using Rubberduck.VBEditor;
 
 namespace Rubberduck.Parsing.ComReflection
 {
     public class XmlComProjectSerializer : IComProjectSerializationProvider
     {
-        public static readonly string DefaultSerializationPath =
-            Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "Rubberduck", "Declarations");
+        public readonly string DefaultSerializationPath;
+
+        public XmlComProjectSerializer(IPersistancePathProvider pathProvider)
+        {
+            DefaultSerializationPath = pathProvider.DataFolderPath("Declarations");
+        }
 
         private static readonly XmlReaderSettings ReaderSettings = new XmlReaderSettings
         {

Rubberduck.SettingsProvider/IPersistancePathProvider.cs

@@ -0,0 +1,8 @@
+namespace Rubberduck.SettingsProvider
+{
+    public interface IPersistancePathProvider
+    {
+        string DataRootPath { get; }
+        string DataFolderPath(string folderName);
+    }
+}

Rubberduck.SettingsProvider/PersistancePathProvider.cs

@@ -0,0 +1,17 @@
+using System;
+using System.IO;
+
+namespace Rubberduck.SettingsProvider
+{
+    public class PersistancePathProvider : IPersistancePathProvider
+    {
+        public string DataRootPath => Path.Combine(
+            Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
+            "Rubberduck");
+
+        public string DataFolderPath(string folderName)
+        {
+            return Path.Combine(DataRootPath, folderName);
+        }
+    }
+}