diff --git a/src/tests/backend/test_plugin_sorter.h b/src/tests/backend/test_plugin_sorter.h
index 14f0a086..4acb739d 100644
--- a/src/tests/backend/test_plugin_sorter.h
+++ b/src/tests/backend/test_plugin_sorter.h
@@ -28,10 +28,167 @@ along with LOOT.  If not, see
 #include "backend/plugin_sorter.h"
 #include "tests/fixtures.h"
 
-class PluginSorter : public SkyrimTest {};
+class PluginSorter : public SkyrimTest {
+protected:
+    inline virtual void SetUp() {
+        SkyrimTest::SetUp();
+
+        game = loot::Game(loot::Game::tes5);
+        game.SetGamePath(dataPath.parent_path());
+        ASSERT_NO_THROW(game.Init(false, localPath));
+
+        callback = [](const std::string&) {};
+    }
+
+    loot::Game game;
+    std::function<void(const std::string&)> callback;
+};
+
+TEST_F(PluginSorter, Sort_NoPlugins) {
+    loot::PluginSorter ps;
+    std::list<loot::Plugin> sorted = ps.Sort(game, loot::Language::english, callback);
+    EXPECT_TRUE(sorted.empty());
+}
 
 TEST_F(PluginSorter, Sort) {
-    FAIL() << "Test is unimplemented";
+    ASSERT_NO_THROW(game.LoadPlugins(false));
+
+    loot::PluginSorter ps;
+    std::list<loot::Plugin> sorted = ps.Sort(game, loot::Language::english, callback);
+    EXPECT_EQ(std::list<loot::Plugin>({
+        loot::Plugin("Skyrim.esm"),
+        loot::Plugin("Blank.esm"),
+        loot::Plugin("Blank - Different.esm"),
+        loot::Plugin("Blank - Master Dependent.esm"),
+        loot::Plugin("Blank - Different Master Dependent.esm"),
+        loot::Plugin("Blank.esp"),
+        loot::Plugin("Blank - Different.esp"),
+        loot::Plugin("Blank - Master Dependent.esp"),
+        loot::Plugin("Blank - Different Master Dependent.esp"),
+        loot::Plugin("Blank - Plugin Dependent.esp"),
+        loot::Plugin("Blank - Different Plugin Dependent.esp"),
+    }), sorted);
+
+    // Check stability.
+    sorted = ps.Sort(game, loot::Language::english, callback);
+    EXPECT_EQ(std::list<loot::Plugin>({
+        loot::Plugin("Skyrim.esm"),
+        loot::Plugin("Blank.esm"),
+        loot::Plugin("Blank - Different.esm"),
+        loot::Plugin("Blank - Master Dependent.esm"),
+        loot::Plugin("Blank - Different Master Dependent.esm"),
+        loot::Plugin("Blank.esp"),
+        loot::Plugin("Blank - Different.esp"),
+        loot::Plugin("Blank - Master Dependent.esp"),
+        loot::Plugin("Blank - Different Master Dependent.esp"),
+        loot::Plugin("Blank - Plugin Dependent.esp"),
+        loot::Plugin("Blank - Different Plugin Dependent.esp"),
+    }), sorted);
+}
+
+TEST_F(PluginSorter, Sort_HeadersOnly) {
+    ASSERT_NO_THROW(game.LoadPlugins(true));
+
+    loot::PluginSorter ps;
+    std::list<loot::Plugin> sorted = ps.Sort(game, loot::Language::english, callback);
+    EXPECT_EQ(std::list<loot::Plugin>({
+        loot::Plugin("Skyrim.esm"),
+        loot::Plugin("Blank.esm"),
+        loot::Plugin("Blank - Different.esm"),
+        loot::Plugin("Blank - Master Dependent.esm"),
+        loot::Plugin("Blank - Different Master Dependent.esm"),
+        loot::Plugin("Blank.esp"),
+        loot::Plugin("Blank - Different.esp"),
+        loot::Plugin("Blank - Master Dependent.esp"),
+        loot::Plugin("Blank - Different Master Dependent.esp"),
+        loot::Plugin("Blank - Plugin Dependent.esp"),
+        loot::Plugin("Blank - Different Plugin Dependent.esp"),
+    }), sorted);
+}
+
+TEST_F(PluginSorter, Sort_WithPriority) {
+    ASSERT_NO_THROW(game.LoadPlugins(false));
+    loot::Plugin plugin("Blank - Different Master Dependent.esp");
+    plugin.Priority(-1100000);
+    game.userlist.AddPlugin(plugin);
+
+    loot::PluginSorter ps;
+    std::list<loot::Plugin> sorted = ps.Sort(game, loot::Language::english, callback);
+    EXPECT_EQ(std::list<loot::Plugin>({
+        loot::Plugin("Skyrim.esm"),
+        loot::Plugin("Blank.esm"),
+        loot::Plugin("Blank - Different.esm"),
+        loot::Plugin("Blank - Master Dependent.esm"),
+        loot::Plugin("Blank - Different Master Dependent.esm"),
+        loot::Plugin("Blank - Different Master Dependent.esp"),
+        loot::Plugin("Blank.esp"),
+        loot::Plugin("Blank - Different.esp"),
+        loot::Plugin("Blank - Master Dependent.esp"),
+        loot::Plugin("Blank - Plugin Dependent.esp"),
+        loot::Plugin("Blank - Different Plugin Dependent.esp"),
+    }), sorted);
+}
+
+TEST_F(PluginSorter, Sort_WithLoadAfter) {
+    ASSERT_NO_THROW(game.LoadPlugins(false));
+    loot::Plugin plugin("Blank.esp");
+    plugin.LoadAfter({
+        loot::File("Blank - Different.esp"),
+        loot::File("Blank - Different Plugin Dependent.esp"),
+    });
+    game.userlist.AddPlugin(plugin);
+
+    loot::PluginSorter ps;
+    std::list<loot::Plugin> sorted = ps.Sort(game, loot::Language::english, callback);
+    EXPECT_EQ(std::list<loot::Plugin>({
+        loot::Plugin("Skyrim.esm"),
+        loot::Plugin("Blank.esm"),
+        loot::Plugin("Blank - Different.esm"),
+        loot::Plugin("Blank - Master Dependent.esm"),
+        loot::Plugin("Blank - Different Master Dependent.esm"),
+        loot::Plugin("Blank - Different.esp"),
+        loot::Plugin("Blank - Master Dependent.esp"),
+        loot::Plugin("Blank - Different Master Dependent.esp"),
+        loot::Plugin("Blank - Different Plugin Dependent.esp"),
+        loot::Plugin("Blank.esp"),
+        loot::Plugin("Blank - Plugin Dependent.esp"),
+    }), sorted);
+}
+
+TEST_F(PluginSorter, Sort_WithRequirements) {
+    ASSERT_NO_THROW(game.LoadPlugins(false));
+    loot::Plugin plugin("Blank.esp");
+    plugin.Reqs({
+        loot::File("Blank - Different.esp"),
+        loot::File("Blank - Different Plugin Dependent.esp"),
+    });
+    game.userlist.AddPlugin(plugin);
+
+    loot::PluginSorter ps;
+    std::list<loot::Plugin> sorted = ps.Sort(game, loot::Language::english, callback);
+    EXPECT_EQ(std::list<loot::Plugin>({
+        loot::Plugin("Skyrim.esm"),
+        loot::Plugin("Blank.esm"),
+        loot::Plugin("Blank - Different.esm"),
+        loot::Plugin("Blank - Master Dependent.esm"),
+        loot::Plugin("Blank - Different Master Dependent.esm"),
+        loot::Plugin("Blank - Different.esp"),
+        loot::Plugin("Blank - Master Dependent.esp"),
+        loot::Plugin("Blank - Different Master Dependent.esp"),
+        loot::Plugin("Blank - Different Plugin Dependent.esp"),
+        loot::Plugin("Blank.esp"),
+        loot::Plugin("Blank - Plugin Dependent.esp"),
+    }), sorted);
+}
+
+TEST_F(PluginSorter, Sort_HasCycle) {
+    ASSERT_NO_THROW(game.LoadPlugins(false));
+    loot::Plugin plugin("Blank.esm");
+    plugin.LoadAfter({loot::File("Blank - Master Dependent.esm")});
+    game.userlist.AddPlugin(plugin);
+
+    loot::PluginSorter ps;
+    EXPECT_ANY_THROW(ps.Sort(game, loot::Language::english, callback));
 }
 
 #endif