chore: remove Singleton & replace getIApp with getApp (#5514)

tests/src/SplitInput.cpp

@@ -5,7 +5,7 @@
 #include "controllers/commands/Command.hpp"
 #include "controllers/commands/CommandController.hpp"
 #include "controllers/hotkeys/HotkeyController.hpp"
-#include "mocks/EmptyApplication.hpp"
+#include "mocks/BaseApplication.hpp"
 #include "singletons/Emotes.hpp"
 #include "singletons/Fonts.hpp"
 #include "singletons/Paths.hpp"
@@ -24,13 +24,14 @@ using ::testing::Exactly;
 
 namespace {
 
-class MockApplication : mock::EmptyApplication
+class MockApplication : public mock::BaseApplication
 {
 public:
     MockApplication()
-        : settings(this->settingsDir.filePath("settings.json"))
+        : theme(this->paths_)
         , fonts(this->settings)
-        , windowManager(this->paths)
+        , windowManager(this->paths_)
+        , commands(this->paths_)
     {
     }
     Theme *getThemes() override
@@ -68,11 +69,9 @@ public:
         return &this->emotes;
     }
 
-    Settings settings;
     Theme theme;
     HotkeyController hotkeys;
     Fonts fonts;
-    Paths paths;
     WindowManager windowManager;
     AccountController accounts;
     CommandController commands;