Functional prefs implementation

test/BaseJsTest.h

Index: test/BaseJsTest.h
===================================================================
--- a/test/BaseJsTest.h
+++ b/test/BaseJsTest.h
@@ -29,16 +29,17 @@ public:
         const std::string& source)
   {
     throw std::runtime_error("Unexpected error: " + message);
   }
 };
 
 class ThrowingFileSystem : public AdblockPlus::FileSystem
 {
+public:
   std::tr1::shared_ptr<std::istream> Read(const std::string& path) const
   {
     throw std::runtime_error("Not implemented");
   }
 
   void Write(const std::string& path,
              std::tr1::shared_ptr<std::istream> content)
   {
@@ -64,33 +65,34 @@ class ThrowingFileSystem : public Adbloc
   {
     throw std::runtime_error("Not implemented");
   }
 
 };
 
 class ThrowingWebRequest : public AdblockPlus::WebRequest
 {
+public:
   AdblockPlus::ServerResponse GET(const std::string& url, const AdblockPlus::HeaderList& requestHeaders) const
   {
     throw std::runtime_error("Unexpected GET: " + url);
   }
 };
 
 class LazyFileSystem : public AdblockPlus::FileSystem
 {
+public:
   std::tr1::shared_ptr<std::istream> Read(const std::string& path) const
   {
+    std::string dummyData("");
     if (path == "patterns.ini")
-    {
-      std::string dummyData("# Adblock Plus preferences\n[Subscription]\nurl=~fl~");
-      return std::tr1::shared_ptr<std::istream>(new std::istringstream(dummyData));
-    }
-    else
-      return std::tr1::shared_ptr<std::istream>();
+      dummyData = "# Adblock Plus preferences\n[Subscription]\nurl=~fl~";
+    else if (path == "prefs.json")
+      dummyData = "{}";
+    return std::tr1::shared_ptr<std::istream>(new std::istringstream(dummyData));
   }
 
   void Write(const std::string& path,
              std::tr1::shared_ptr<std::istream> content)
   {
   }
 
   void Move(const std::string& fromPath, const std::string& toPath)