diff --git a/src/core/songloader.cpp b/src/core/songloader.cpp
index b5a895823..87231709a 100644
--- a/src/core/songloader.cpp
+++ b/src/core/songloader.cpp
@@ -34,7 +34,7 @@
 QSet<QString> SongLoader::sRawUriSchemes;
 const int SongLoader::kDefaultTimeout = 5000;
 
-SongLoader::SongLoader(LibraryBackend* library, QObject *parent)
+SongLoader::SongLoader(LibraryBackendInterface* library, QObject *parent)
   : QObject(parent),
     timeout_timer_(new QTimer(this)),
     playlist_parser_(new PlaylistParser(this)),
@@ -173,7 +173,7 @@ void SongLoader::LoadLocalDirectory(const QString& filename) {
 
   while (it.hasNext()) {
     // This is in another thread so we can do blocking calls.
-    LoadLocal(filename, true);
+    LoadLocal(it.next(), true);
   }
 
   qStableSort(songs_.begin(), songs_.end(), CompareSongs);
diff --git a/src/core/songloader.h b/src/core/songloader.h
index ab9fbc1ec..b6f01c28f 100644
--- a/src/core/songloader.h
+++ b/src/core/songloader.h
@@ -29,14 +29,14 @@
 # include <gst/gst.h>
 #endif
 
-class LibraryBackend;
+class LibraryBackendInterface;
 class ParserBase;
 class PlaylistParser;
 
 class SongLoader : public QObject {
   Q_OBJECT
 public:
-  SongLoader(LibraryBackend* library, QObject* parent = 0);
+  SongLoader(LibraryBackendInterface* library, QObject* parent = 0);
   ~SongLoader();
 
   enum Result {
@@ -107,7 +107,7 @@ private:
   ParserBase* parser_;
   QString mime_type_;
   QByteArray buffer_;
-  LibraryBackend* library_;
+  LibraryBackendInterface* library_;
 
 #ifdef HAVE_GSTREAMER
   boost::shared_ptr<GstElement> pipeline_;
diff --git a/src/library/librarybackend.cpp b/src/library/librarybackend.cpp
index a546cf17c..bf7f5dae4 100644
--- a/src/library/librarybackend.cpp
+++ b/src/library/librarybackend.cpp
@@ -27,7 +27,7 @@
 #include <QCoreApplication>
 
 LibraryBackend::LibraryBackend(QObject *parent)
-  : QObject(parent)
+  : LibraryBackendInterface(parent)
 {
 }
 
diff --git a/src/library/librarybackend.h b/src/library/librarybackend.h
index 3668ce73a..bcf47f6fd 100644
--- a/src/library/librarybackend.h
+++ b/src/library/librarybackend.h
@@ -28,16 +28,10 @@
 
 class Database;
 
-class LibraryBackend : public QObject {
-  Q_OBJECT
-
+class LibraryBackendInterface : public QObject {
  public:
-  Q_INVOKABLE LibraryBackend(QObject* parent = 0);
-  void Init(boost::shared_ptr<Database> db, const QString& songs_table,
-            const QString& dirs_table, const QString& subdirs_table,
-            const QString& fts_table);
-
-  boost::shared_ptr<Database> db() const { return db_; }
+  LibraryBackendInterface(QObject* parent = 0) : QObject(parent) {}
+  virtual ~LibraryBackendInterface() {}
 
   struct Album {
     Album() {}
@@ -57,6 +51,51 @@ class LibraryBackend : public QObject {
   };
   typedef QList<Album> AlbumList;
 
+  // Get a list of directories in the library.  Emits DirectoriesDiscovered.
+  virtual void LoadDirectoriesAsync() = 0;
+
+  // Counts the songs in the library.  Emits TotalSongCountUpdated
+  virtual void UpdateTotalSongCountAsync() = 0;
+
+  virtual SongList FindSongsInDirectory(int id) = 0;
+  virtual SubdirectoryList SubdirsInDirectory(int id) = 0;
+  virtual DirectoryList GetAllDirectories() = 0;
+  virtual void ChangeDirPath(int id, const QString& new_path) = 0;
+
+  virtual QStringList GetAllArtists(const QueryOptions& opt = QueryOptions()) = 0;
+  virtual QStringList GetAllArtistsWithAlbums(const QueryOptions& opt = QueryOptions()) = 0;
+  virtual SongList GetSongs(
+      const QString& artist, const QString& album, const QueryOptions& opt = QueryOptions()) = 0;
+
+  virtual bool HasCompilations(const QueryOptions& opt = QueryOptions()) = 0;
+  virtual SongList GetCompilationSongs(const QString& album, const QueryOptions& opt = QueryOptions()) = 0;
+
+  virtual AlbumList GetAllAlbums(const QueryOptions& opt = QueryOptions()) = 0;
+  virtual AlbumList GetAlbumsByArtist(const QString& artist, const QueryOptions& opt = QueryOptions()) = 0;
+  virtual AlbumList GetCompilationAlbums(const QueryOptions& opt = QueryOptions()) = 0;
+
+  virtual void UpdateManualAlbumArtAsync(const QString& artist, const QString& album, const QString& art) = 0;
+  virtual Album GetAlbumArt(const QString& artist, const QString& album) = 0;
+
+  virtual Song GetSongById(int id) = 0;
+
+  virtual void AddDirectory(const QString& path) = 0;
+  virtual void RemoveDirectory(const Directory& dir) = 0;
+
+  virtual bool ExecQuery(LibraryQuery* q) = 0;
+};
+
+class LibraryBackend : public LibraryBackendInterface {
+  Q_OBJECT
+
+ public:
+  Q_INVOKABLE LibraryBackend(QObject* parent = 0);
+  void Init(boost::shared_ptr<Database> db, const QString& songs_table,
+            const QString& dirs_table, const QString& subdirs_table,
+            const QString& fts_table);
+
+  boost::shared_ptr<Database> db() const { return db_; }
+
   QString songs_table() const { return songs_table_; }
   QString dirs_table() const { return dirs_table_; }
   QString subdirs_table() const { return subdirs_table_; }
diff --git a/src/playlist/songloaderinserter.cpp b/src/playlist/songloaderinserter.cpp
index ed9796f17..3536d0c4c 100644
--- a/src/playlist/songloaderinserter.cpp
+++ b/src/playlist/songloaderinserter.cpp
@@ -20,7 +20,7 @@
 #include "core/taskmanager.h"
 
 SongLoaderInserter::SongLoaderInserter(
-    TaskManager* task_manager, LibraryBackend* library, QObject *parent)
+    TaskManager* task_manager, LibraryBackendInterface* library, QObject *parent)
     : QObject(parent),
       task_manager_(task_manager),
       destination_(NULL),
diff --git a/src/playlist/songloaderinserter.h b/src/playlist/songloaderinserter.h
index 9c1f98298..ee16a8b6b 100644
--- a/src/playlist/songloaderinserter.h
+++ b/src/playlist/songloaderinserter.h
@@ -23,7 +23,7 @@
 
 #include "core/song.h"
 
-class LibraryBackend;
+class LibraryBackendInterface;
 class Playlist;
 class SongLoader;
 class TaskManager;
@@ -33,7 +33,7 @@ class QModelIndex;
 class SongLoaderInserter : public QObject {
   Q_OBJECT
 public:
-  SongLoaderInserter(TaskManager* task_manager, LibraryBackend* library, QObject* parent = 0);
+  SongLoaderInserter(TaskManager* task_manager, LibraryBackendInterface* library, QObject* parent = 0);
   ~SongLoaderInserter();
 
   void Load(Playlist* destination, int row, bool play_now, const QList<QUrl>& urls);
@@ -60,7 +60,7 @@ private:
   QSet<SongLoader*> pending_;
   int async_load_id_;
   int async_progress_;
-  LibraryBackend* library_;
+  LibraryBackendInterface* library_;
 };
 
 #endif // SONGLOADERINSERTER_H
diff --git a/src/ui/mainwindow.cpp b/src/ui/mainwindow.cpp
index 577ddf4b7..ff7cff5c3 100644
--- a/src/ui/mainwindow.cpp
+++ b/src/ui/mainwindow.cpp
@@ -30,6 +30,7 @@
 #include "devices/devicestatefiltermodel.h"
 #include "engines/enginebase.h"
 #include "library/groupbydialog.h"
+#include "library/librarybackend.h"
 #include "library/libraryconfig.h"
 #include "library/librarydirectorymodel.h"
 #include "library/library.h"
diff --git a/tests/mock_librarybackend.h b/tests/mock_librarybackend.h
new file mode 100644
index 000000000..1158c03fc
--- /dev/null
+++ b/tests/mock_librarybackend.h
@@ -0,0 +1,43 @@
+#ifndef MOCKLIBRARYBACKEND_H
+#define MOCKLIBRARYBACKEND_H
+
+#include <gmock/gmock.h>
+
+#include "library/librarybackend.h"
+
+class MockLibraryBackend : public LibraryBackendInterface {
+ public:
+  // Get a list of directories in the library.  Emits DirectoriesDiscovered.
+  MOCK_METHOD0(LoadDirectoriesAsync, void());
+
+  // Counts the songs in the library.  Emits TotalSongCountUpdated
+  MOCK_METHOD0(UpdateTotalSongCountAsync, void());
+
+  MOCK_METHOD1(FindSongsInDirectory, SongList(int));
+  MOCK_METHOD1(SubdirsInDirectory, SubdirectoryList(int));
+  MOCK_METHOD0(GetAllDirectories, DirectoryList());
+  MOCK_METHOD2(ChangeDirPath, void(int, const QString&));
+
+  MOCK_METHOD1(GetAllArtists, QStringList(const QueryOptions&));
+  MOCK_METHOD1(GetAllArtistsWithAlbums, QStringList(const QueryOptions&));
+  MOCK_METHOD3(GetSongs, SongList(const QString&, const QString&, const QueryOptions&));
+
+  MOCK_METHOD1(HasCompilations, bool(const QueryOptions&));
+  MOCK_METHOD2(GetCompilationSongs, SongList(const QString&, const QueryOptions&));
+
+  MOCK_METHOD1(GetAllAlbums, AlbumList(const QueryOptions&));
+  MOCK_METHOD2(GetAlbumsByArtist, AlbumList(const QString&, const QueryOptions&));
+  MOCK_METHOD1(GetCompilationAlbums, AlbumList(const QueryOptions&));
+
+  MOCK_METHOD3(UpdateManualAlbumArtAsync, void(const QString&, const QString&, const QString&));
+  MOCK_METHOD2(GetAlbumArt, Album(const QString&, const QString&));
+
+  MOCK_METHOD1(GetSongById, Song(int));
+
+  MOCK_METHOD1(AddDirectory, void(const QString&));
+  MOCK_METHOD1(RemoveDirectory, void(const Directory&));
+
+  MOCK_METHOD1(ExecQuery, bool(LibraryQuery*));
+};
+
+#endif
diff --git a/tests/playlist_test.cpp b/tests/playlist_test.cpp
index 9bb84b02c..5ff50ea6b 100644
--- a/tests/playlist_test.cpp
+++ b/tests/playlist_test.cpp
@@ -33,7 +33,7 @@ namespace {
 class PlaylistTest : public ::testing::Test {
  protected:
   PlaylistTest()
-    : playlist_(NULL, NULL, NULL),
+    : playlist_(NULL, NULL, NULL, NULL),
       sequence_(NULL, new DummySettingsProvider)
   {
   }
diff --git a/tests/songloader_test.cpp b/tests/songloader_test.cpp
index 958b18fd8..50d51249b 100644
--- a/tests/songloader_test.cpp
+++ b/tests/songloader_test.cpp
@@ -17,6 +17,7 @@
 #include "test_utils.h"
 #include "gmock/gmock-matchers.h"
 #include "gtest/gtest.h"
+#include "mock_librarybackend.h"
 
 #include "core/songloader.h"
 #include "engines/gstengine.h"
@@ -30,6 +31,9 @@
 #include <boost/scoped_ptr.hpp>
 #include <cstdlib>
 
+using ::testing::_;
+using ::testing::Return;
+
 class SongLoaderTest : public ::testing::Test {
 public:
   static void SetUpTestCase() {
@@ -45,7 +49,8 @@ public:
 
 protected:
   void SetUp() {
-    loader_.reset(new SongLoader);
+    library_.reset(new MockLibraryBackend);
+    loader_.reset(new SongLoader(library_.get()));
     loader_->set_timeout(20000);
   }
 
@@ -55,6 +60,7 @@ protected:
   static GstEngine* sGstEngine;
 
   boost::scoped_ptr<SongLoader> loader_;
+  boost::scoped_ptr<MockLibraryBackend> library_;
 };
 
 const char* SongLoaderTest::kRemoteUrl = "http://remotetestdata.clementine-player.org";
@@ -70,6 +76,17 @@ TEST_F(SongLoaderTest, LoadLocalMp3) {
   EXPECT_EQ("Beep mp3", loader_->songs()[0].title());
 }
 
+TEST_F(SongLoaderTest, LoadLocalFileQueryExecutesButEmpty) {
+  EXPECT_CALL(*library_.get(), ExecQuery(_)).WillOnce(Return(true));
+  TemporaryResource file(":/testdata/beep.mp3");
+  SongLoader::Result ret = loader_->Load(QUrl::fromLocalFile(file.fileName()));
+
+  ASSERT_EQ(SongLoader::Success, ret);
+  ASSERT_EQ(1, loader_->songs().count());
+  EXPECT_TRUE(loader_->songs()[0].is_valid());
+  EXPECT_EQ("Beep mp3", loader_->songs()[0].title());
+}
+
 TEST_F(SongLoaderTest, LoadLocalPls) {
   TemporaryResource file(":/testdata/pls_one.pls");
   SongLoader::Result ret = loader_->Load(QUrl::fromLocalFile(file.fileName()));