22 files changed, 361 insertions, 420 deletions

diff --git a/src/crepe/api/CMakeLists.txt b/src/crepe/api/CMakeLists.txt
index 593c4e6..ca4edec 100644
--- a/src/crepe/api/CMakeLists.txt
+++ b/src/crepe/api/CMakeLists.txt
@@ -15,10 +15,7 @@ target_sources(crepe PUBLIC
 	Animator.cpp
 	BoxCollider.cpp
 	CircleCollider.cpp
-	IKeyListener.cpp
-	IMouseListener.cpp
 	LoopManager.cpp
-	LoopTimer.cpp
 	Asset.cpp
 	EventHandler.cpp
 	Script.cpp
@@ -51,10 +48,7 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	EventHandler.h
 	EventHandler.hpp
 	Event.h
-	IKeyListener.h
-	IMouseListener.h
 	LoopManager.h
-	LoopTimer.h
 	Asset.h
 	Button.h
 	UIObject.h
diff --git a/src/crepe/api/IKeyListener.cpp b/src/crepe/api/IKeyListener.cpp
deleted file mode 100644
index 8642655..0000000
--- a/src/crepe/api/IKeyListener.cpp
+++ /dev/null
@@ -1,19 +0,0 @@
-#include "IKeyListener.h"
-
-using namespace crepe;
-
-// Constructor with specified channel
-IKeyListener::IKeyListener(event_channel_t channel)
-	: event_manager(EventManager::get_instance()) {
-	this->press_id = event_manager.subscribe<KeyPressEvent>(
-		[this](const KeyPressEvent & event) { return this->on_key_pressed(event); }, channel);
-	this->release_id = event_manager.subscribe<KeyReleaseEvent>(
-		[this](const KeyReleaseEvent & event) { return this->on_key_released(event); },
-		channel);
-}
-
-// Destructor, unsubscribe events
-IKeyListener::~IKeyListener() {
-	event_manager.unsubscribe(this->press_id);
-	event_manager.unsubscribe(this->release_id);
-}
diff --git a/src/crepe/api/IKeyListener.h b/src/crepe/api/IKeyListener.h
deleted file mode 100644
index 180a0a6..0000000
--- a/src/crepe/api/IKeyListener.h
+++ /dev/null
@@ -1,50 +0,0 @@
-#pragma once
-
-#include "../manager/EventManager.h"
-
-#include "Event.h"
-#include "EventHandler.h"
-
-namespace crepe {
-
-/**
- * \class IKeyListener
- * \brief Interface for keyboard event handling in the application.
- */
-class IKeyListener {
-public:
-	/**
-	 * \brief Constructs an IKeyListener with a specified channel.
-	 * \param channel The channel ID for event handling.
-	 */
-	IKeyListener(event_channel_t channel = EventManager::CHANNEL_ALL);
-	virtual ~IKeyListener();
-	IKeyListener(const IKeyListener &) = delete;
-	IKeyListener & operator=(const IKeyListener &) = delete;
-	IKeyListener & operator=(IKeyListener &&) = delete;
-	IKeyListener(IKeyListener &&) = delete;
-
-	/**
-	 * \brief Pure virtual function to handle key press events.
-	 * \param event The key press event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_key_pressed(const KeyPressEvent & event) = 0;
-
-	/**
-	 * \brief Pure virtual function to handle key release events.
-	 * \param event The key release event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_key_released(const KeyReleaseEvent & event) = 0;
-
-private:
-	//! Key press event id
-	subscription_t press_id = -1;
-	//! Key release event id
-	subscription_t release_id = -1;
-	//! EventManager reference
-	EventManager & event_manager;
-};
-
-} // namespace crepe
diff --git a/src/crepe/api/IMouseListener.cpp b/src/crepe/api/IMouseListener.cpp
deleted file mode 100644
index 989aeb3..0000000
--- a/src/crepe/api/IMouseListener.cpp
+++ /dev/null
@@ -1,29 +0,0 @@
-#include "IMouseListener.h"
-
-using namespace crepe;
-
-IMouseListener::IMouseListener(event_channel_t channel)
-	: event_manager(EventManager::get_instance()) {
-	this->click_id = event_manager.subscribe<MouseClickEvent>(
-		[this](const MouseClickEvent & event) { return this->on_mouse_clicked(event); },
-		channel);
-
-	this->press_id = event_manager.subscribe<MousePressEvent>(
-		[this](const MousePressEvent & event) { return this->on_mouse_pressed(event); },
-		channel);
-
-	this->release_id = event_manager.subscribe<MouseReleaseEvent>(
-		[this](const MouseReleaseEvent & event) { return this->on_mouse_released(event); },
-		channel);
-
-	this->move_id = event_manager.subscribe<MouseMoveEvent>(
-		[this](const MouseMoveEvent & event) { return this->on_mouse_moved(event); }, channel);
-}
-
-IMouseListener::~IMouseListener() {
-	// Unsubscribe event handlers
-	event_manager.unsubscribe(this->click_id);
-	event_manager.unsubscribe(this->press_id);
-	event_manager.unsubscribe(this->release_id);
-	event_manager.unsubscribe(this->move_id);
-}
diff --git a/src/crepe/api/IMouseListener.h b/src/crepe/api/IMouseListener.h
deleted file mode 100644
index e19897d..0000000
--- a/src/crepe/api/IMouseListener.h
+++ /dev/null
@@ -1,73 +0,0 @@
-#pragma once
-
-#include "../manager/EventManager.h"
-
-#include "Event.h"
-#include "EventHandler.h"
-
-namespace crepe {
-
-/**
- * \class IMouseListener
- * \brief Interface for mouse event handling in the application.
- */
-class IMouseListener {
-public:
-	/**
-	 * \brief Constructs an IMouseListener with a specified channel.
-	 * \param channel The channel ID for event handling.
-	 */
-	IMouseListener(event_channel_t channel = EventManager::CHANNEL_ALL);
-	virtual ~IMouseListener();
-	IMouseListener & operator=(const IMouseListener &) = delete;
-	IMouseListener(const IMouseListener &) = delete;
-	IMouseListener & operator=(const IMouseListener &&) = delete;
-	IMouseListener(IMouseListener &&) = delete;
-
-	/**
-	 * \brief Move assignment operator (deleted).
-	 */
-	IMouseListener & operator=(IMouseListener &&) = delete;
-
-	/**
-	 * \brief Handles a mouse click event.
-	 * \param event The mouse click event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_mouse_clicked(const MouseClickEvent & event) = 0;
-
-	/**
-	 * \brief Handles a mouse press event.
-	 * \param event The mouse press event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_mouse_pressed(const MousePressEvent & event) = 0;
-
-	/**
-	 * \brief Handles a mouse release event.
-	 * \param event The mouse release event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_mouse_released(const MouseReleaseEvent & event) = 0;
-
-	/**
-	 * \brief Handles a mouse move event.
-	 * \param event The mouse move event to handle.
-	 * \return True if the event was handled, false otherwise.
-	 */
-	virtual bool on_mouse_moved(const MouseMoveEvent & event) = 0;
-
-private:
-	//! Mouse click event id
-	subscription_t click_id = -1;
-	//! Mouse press event id
-	subscription_t press_id = -1;
-	//! Mouse release event id
-	subscription_t release_id = -1;
-	//! Mouse move event id
-	subscription_t move_id = -1;
-	//! EventManager reference
-	EventManager & event_manager;
-};
-
-} //namespace crepe
diff --git a/src/crepe/api/LoopManager.cpp b/src/crepe/api/LoopManager.cpp
index 044f096..c25e31e 100644
--- a/src/crepe/api/LoopManager.cpp
+++ b/src/crepe/api/LoopManager.cpp
@@ -1,3 +1,6 @@
+#include "../facade/SDLContext.h"
+
+#include "../manager/EventManager.h"
 #include "../system/AnimatorSystem.h"
 #include "../system/CollisionSystem.h"
 #include "../system/InputSystem.h"
@@ -20,18 +23,20 @@ LoopManager::LoopManager() {
 	this->load_system<RenderSystem>();
 	this->load_system<ScriptSystem>();
 	this->load_system<InputSystem>();
+	this->event_manager.subscribe<ShutDownEvent>(
+		[this](const ShutDownEvent & event) { return this->on_shutdown(event); });
 }
 
-void LoopManager::process_input() { this->get_system<InputSystem>().update(); }
+void LoopManager::process_input() { 
+	this->get_system<InputSystem>().update();
+}
 
 void LoopManager::start() {
 	this->setup();
 	this->loop();
 }
-void LoopManager::set_running(bool running) { this->game_running = running; }
 
 void LoopManager::fixed_update() {
-	// TODO: retrieve EventManager from direct member after singleton refactor
 	EventManager & ev = this->mediator.event_manager;
 	ev.dispatch_events();
 	this->get_system<ScriptSystem>().update();
@@ -40,31 +45,27 @@ void LoopManager::fixed_update() {
 }
 
 void LoopManager::loop() {
-	LoopTimer & timer = this->loop_timer;
-	timer.start();
+	
 
 	while (game_running) {
-		timer.update();
+		this->loop_timer.update();
 
-		while (timer.get_lag() >= timer.get_fixed_delta_time()) {
+		while (this->loop_timer.get_lag() >= this->loop_timer.get_fixed_delta_time()) {
 			this->process_input();
+			event_manager.dispatch_events();
 			this->fixed_update();
-			timer.advance_fixed_update();
+			this->loop_timer.advance_fixed_update();
 		}
 
 		this->update();
 		this->render();
-
-		timer.enforce_frame_rate();
+		this->loop_timer.enforce_frame_rate();
 	}
 }
 
 void LoopManager::setup() {
-	LoopTimer & timer = this->loop_timer;
 	this->game_running = true;
-	this->scene_manager.load_next_scene();
-	timer.start();
-	timer.set_fps(200);
+	this->loop_timer.start();
 	this->scene_manager.load_next_scene();
 }
 
@@ -74,5 +75,9 @@ void LoopManager::render() {
 	this->get_system<AnimatorSystem>().update();
 	this->get_system<RenderSystem>().update();
 }
+bool LoopManager::on_shutdown(const ShutDownEvent & e) {
+	this->game_running = false;
+	return false;
+}
 
 void LoopManager::update() {}
diff --git a/src/crepe/api/LoopManager.h b/src/crepe/api/LoopManager.h
index d8910a0..9986aa5 100644
--- a/src/crepe/api/LoopManager.h
+++ b/src/crepe/api/LoopManager.h
@@ -5,12 +5,14 @@
 #include "../facade/SDLContext.h"
 #include "../manager/ComponentManager.h"
 #include "../manager/SceneManager.h"
+#include "../manager/EventManager.h"
+#include "../manager/LoopTimerManager.h"
 #include "../system/System.h"
+#include "../manager/Mediator.h"
 
-#include "LoopTimer.h"
+#include "api/Event.h"
 
 namespace crepe {
-
 /**
  * \brief Main game loop manager
  *
@@ -18,8 +20,14 @@ namespace crepe {
  */
 class LoopManager {
 public:
-	void start();
 	LoopManager();
+	/**
+	 * \brief Start the gameloop
+	 *
+	 * This is the start of the engine where the setup is called and then the loop keeps running until the game stops running.
+	 * Developers need to call this function to run the game.
+	 */
+	void start();
 
 	/**
 	 * \brief Add a new concrete scene to the scene manager
@@ -55,7 +63,7 @@ private:
 	 *
 	 * Updates the game state based on the elapsed time since the last frame.
 	 */
-	void update();
+	virtual void update();
 
 	/**
 	 * \brief Late update which is called after update().
@@ -69,21 +77,13 @@ private:
 	 *
 	 * This function updates physics and game logic based on LoopTimer's fixed_delta_time.
 	 */
-	void fixed_update();
-
-	/**
-	 * \brief Set game running variable
-	 *
-	 * \param running running (false = game shutdown, true = game running)
-	 */
-	void set_running(bool running);
-
+	virtual void fixed_update();
 	/**
 	 * \brief Function for executing render-related systems.
 	 *
 	 * Renders the current state of the game to the screen.
 	 */
-	void render();
+	virtual void render();
 
 	bool game_running = false;
 
@@ -95,18 +95,27 @@ private:
 	ComponentManager component_manager{mediator};
 	//! Scene manager instance
 	SceneManager scene_manager{mediator};
+	//! LoopTimerManager instance
+	LoopTimerManager loop_timer{mediator};
+	//! EventManager instance
+	EventManager event_manager{mediator};
 
 	//! SDL context \todo no more singletons!
 	SDLContext & sdl_context = SDLContext::get_instance();
-	//! Loop timer \todo no more singletons!
-	LoopTimer & loop_timer = LoopTimer::get_instance();
+
 
 private:
 	/**
+	 * \brief Callback function for ShutDownEvent
+	 *
+	 * This function sets the game_running variable to false, stopping the gameloop and therefor quitting the game.
+	 */
+	bool on_shutdown(const ShutDownEvent & e);
+	/**
 	 * \brief Collection of System instances
 	 *
 	 * This map holds System instances indexed by the system's class typeid. It is filled in the
-	 * constructor of \c LoopManager using LoopManager::load_system.
+	 * constructor of LoopManager using LoopManager::load_system.
 	 */
 	std::unordered_map<std::type_index, std::unique_ptr<System>> systems;
 	/**
diff --git a/src/crepe/api/LoopTimer.cpp b/src/crepe/api/LoopTimer.cpp
deleted file mode 100644
index 15a0e3a..0000000
--- a/src/crepe/api/LoopTimer.cpp
+++ /dev/null
@@ -1,79 +0,0 @@
-#include <chrono>
-
-#include "../facade/SDLContext.h"
-#include "../util/Log.h"
-
-#include "LoopTimer.h"
-
-using namespace crepe;
-
-LoopTimer::LoopTimer() { dbg_trace(); }
-
-LoopTimer & LoopTimer::get_instance() {
-	static LoopTimer instance;
-	return instance;
-}
-
-void LoopTimer::start() {
-	this->last_frame_time = std::chrono::steady_clock::now();
-	this->elapsed_time = std::chrono::milliseconds(0);
-	this->elapsed_fixed_time = std::chrono::milliseconds(0);
-	this->delta_time = std::chrono::milliseconds(0);
-}
-
-void LoopTimer::update() {
-	auto current_frame_time = std::chrono::steady_clock::now();
-	// Convert to duration in seconds for delta time
-	this->delta_time = std::chrono::duration_cast<std::chrono::duration<double>>(
-		current_frame_time - last_frame_time);
-
-	if (this->delta_time > this->maximum_delta_time) {
-		this->delta_time = this->maximum_delta_time;
-	}
-
-	this->delta_time *= this->game_scale;
-	this->elapsed_time += this->delta_time;
-	this->last_frame_time = current_frame_time;
-}
-
-double LoopTimer::get_delta_time() const { return this->delta_time.count(); }
-
-double LoopTimer::get_current_time() const { return this->elapsed_time.count(); }
-
-void LoopTimer::advance_fixed_update() { this->elapsed_fixed_time += this->fixed_delta_time; }
-
-double LoopTimer::get_fixed_delta_time() const { return this->fixed_delta_time.count(); }
-
-void LoopTimer::set_fps(int fps) {
-	this->fps = fps;
-	// target time per frame in seconds
-	this->frame_target_time = std::chrono::duration<double>(1.0) / fps;
-}
-
-int LoopTimer::get_fps() const { return this->fps; }
-
-void LoopTimer::set_game_scale(double value) { this->game_scale = value; }
-
-double LoopTimer::get_game_scale() const { return this->game_scale; }
-void LoopTimer::enforce_frame_rate() {
-	std::chrono::steady_clock::time_point current_frame_time
-		= std::chrono::steady_clock::now();
-	std::chrono::milliseconds frame_duration
-		= std::chrono::duration_cast<std::chrono::milliseconds>(current_frame_time
-																- this->last_frame_time);
-
-	if (frame_duration < this->frame_target_time) {
-		std::chrono::milliseconds delay_time
-			= std::chrono::duration_cast<std::chrono::milliseconds>(this->frame_target_time
-																	- frame_duration);
-		if (delay_time.count() > 0) {
-			SDLContext::get_instance().delay(delay_time.count());
-		}
-	}
-
-	this->last_frame_time = current_frame_time;
-}
-
-double LoopTimer::get_lag() const {
-	return (this->elapsed_time - this->elapsed_fixed_time).count();
-}
diff --git a/src/crepe/manager/CMakeLists.txt b/src/crepe/manager/CMakeLists.txt
index 517b8a2..29d6df0 100644
--- a/src/crepe/manager/CMakeLists.txt
+++ b/src/crepe/manager/CMakeLists.txt
@@ -4,6 +4,7 @@ target_sources(crepe PUBLIC
 	Manager.cpp
 	SaveManager.cpp
 	SceneManager.cpp
+	LoopTimerManager.cpp
 )
 
 target_sources(crepe PUBLIC FILE_SET HEADERS FILES
@@ -16,5 +17,6 @@ target_sources(crepe PUBLIC FILE_SET HEADERS FILES
 	SaveManager.h
 	SceneManager.h
 	SceneManager.hpp
+	LoopTimerManager.h
 )
 
diff --git a/src/crepe/manager/EventManager.cpp b/src/crepe/manager/EventManager.cpp
index 20f0dd3..9b0fa95 100644
--- a/src/crepe/manager/EventManager.cpp
+++ b/src/crepe/manager/EventManager.cpp
@@ -3,11 +3,9 @@
 using namespace crepe;
 using namespace std;
 
-EventManager & EventManager::get_instance() {
-	static EventManager instance;
-	return instance;
+EventManager::EventManager(Mediator & mediator) : Manager(mediator){
+	this->mediator.event_manager = *this;
 }
-
 void EventManager::dispatch_events() {
 	for (auto & event : this->events_queue) {
 		this->handle_event(event.type, event.channel, *event.event.get());
diff --git a/src/crepe/manager/EventManager.h b/src/crepe/manager/EventManager.h
index ba5e98b..30b929c 100644
--- a/src/crepe/manager/EventManager.h
+++ b/src/crepe/manager/EventManager.h
@@ -8,6 +8,8 @@
 #include "../api/Event.h"
 #include "../api/EventHandler.h"
 
+#include "Manager.h"
+
 namespace crepe {
 
 //! Event listener unique ID
@@ -22,27 +24,16 @@ typedef size_t subscription_t;
 typedef size_t event_channel_t;
 
 /**
- * \class EventManager
  * \brief Manages event subscriptions, triggers, and queues, enabling decoupled event handling.
  *
  * The `EventManager` acts as a centralized event system. It allows for registering callbacks
  * for specific event types, triggering events synchronously, queueing events for later
  * processing, and managing subscriptions via unique identifiers.
  */
-class EventManager {
+class EventManager : public Manager {
 public:
 	static constexpr const event_channel_t CHANNEL_ALL = -1;
-
-	/**
-	 * \brief Get the singleton instance of the EventManager.
-	 *
-	 * This method returns the unique instance of the EventManager, creating it if it
-	 * doesn't already exist. Ensures only one instance is active in the program.
-	 *
-	 * \return Reference to the singleton instance of the EventManager.
-	 */
-	static EventManager & get_instance();
-
+	EventManager(Mediator & mediator);
 	/**
 	 * \brief Subscribe to a specific event type.
 	 *
@@ -107,12 +98,6 @@ public:
 	void clear();
 
 private:
-	/**
-	 * \brief Default constructor for the EventManager.
-	 *
-	 * Constructor is private to enforce the singleton pattern.
-	 */
-	EventManager() = default;
 
 	/**
 	 * \struct QueueEntry
diff --git a/src/crepe/manager/LoopTimerManager.cpp b/src/crepe/manager/LoopTimerManager.cpp
new file mode 100644
index 0000000..2379fdd
--- /dev/null
+++ b/src/crepe/manager/LoopTimerManager.cpp
@@ -0,0 +1,77 @@
+#include <chrono>
+#include <thread>
+
+#include "../facade/SDLContext.h"
+#include "../util/Log.h"
+
+#include "LoopTimerManager.h"
+
+using namespace crepe;
+
+LoopTimerManager::LoopTimerManager(Mediator & mediator) : Manager(mediator) { 
+	this->mediator.loop_timer = *this;
+	dbg_trace(); 
+	}
+
+void LoopTimerManager::start() {
+	this->last_frame_time = std::chrono::steady_clock::now();
+
+	this->elapsed_time = std::chrono::milliseconds(0);
+	// by starting the elapsed_fixed_time at (0 - fixed_delta_time) in milliseconds it calls a fixed update at the start of the loop.
+	this->elapsed_fixed_time
+		= -std::chrono::duration_cast<std::chrono::milliseconds>(fixed_delta_time);
+	this->delta_time = std::chrono::milliseconds(0);
+}
+
+void LoopTimerManager::update() {
+	auto current_frame_time = std::chrono::steady_clock::now();
+	// Convert to duration in seconds for delta time
+	this->delta_time = std::chrono::duration_cast<std::chrono::duration<double>>(
+		current_frame_time - last_frame_time);
+
+	if (this->delta_time > this->maximum_delta_time) {
+		this->delta_time = this->maximum_delta_time;
+	}
+	this->actual_fps = 1.0 / this->delta_time.count();
+
+	this->elapsed_time += this->delta_time;
+	this->last_frame_time = current_frame_time;
+}
+
+double LoopTimerManager::get_delta_time() const { return this->delta_time.count() * this->time_scale; }
+
+double LoopTimerManager::get_current_time() const { return this->elapsed_time.count(); }
+
+void LoopTimerManager::advance_fixed_update() { this->elapsed_fixed_time += this->fixed_delta_time; }
+
+double LoopTimerManager::get_fixed_delta_time() const { return this->fixed_delta_time.count(); }
+
+void LoopTimerManager::set_target_fps(int fps) {
+	this->target_fps = fps;
+	// target time per frame in seconds
+	this->frame_target_time = std::chrono::duration<double>(1.0) / this->target_fps;
+}
+
+int LoopTimerManager::get_fps() const { return this->actual_fps; }
+
+void LoopTimerManager::set_time_scale(double value) { this->time_scale = value; }
+
+double LoopTimerManager::get_time_scale() const { return this->time_scale; }
+void LoopTimerManager::enforce_frame_rate() {
+	auto current_frame_time = std::chrono::steady_clock::now();
+	auto frame_duration = current_frame_time - this->last_frame_time;
+
+	// Check if frame duration is less than the target frame time
+	if (frame_duration < this->frame_target_time) {
+		auto delay_time = std::chrono::duration_cast<std::chrono::microseconds>(
+			this->frame_target_time - frame_duration);
+
+		if (delay_time.count() > 0) {
+			std::this_thread::sleep_for(delay_time);
+		}
+	}
+}
+
+double LoopTimerManager::get_lag() const {
+	return (this->elapsed_time - this->elapsed_fixed_time).count();
+}
diff --git a/src/crepe/api/LoopTimer.h b/src/crepe/manager/LoopTimerManager.h
index 9393439..cd05bf2 100644
--- a/src/crepe/api/LoopTimer.h
+++ b/src/crepe/manager/LoopTimerManager.h
@@ -2,17 +2,21 @@
 
 #include <chrono>
 
+#include "Manager.h"
+
 namespace crepe {
 
-class LoopTimer {
+/**
+ * \brief Manages timing and frame rate for the game loop.
+ * 
+ * The LoopTimerManager class is responsible for calculating and managing timing functions 
+ * such as delta time, frames per second (FPS), fixed time steps, and time scaling. It ensures 
+ * consistent frame updates and supports game loop operations, such as handling fixed updates 
+ * for physics and other time-sensitive operations.
+ */
+class LoopTimerManager : public Manager {
 public:
-	/**
-	 * \brief Get the singleton instance of LoopTimer.
-	 *
-	 * \return A reference to the LoopTimer instance.
-	 */
-	static LoopTimer & get_instance();
-
+	LoopTimerManager(Mediator & mediator);
 	/**
 	 * \brief Get the current delta time for the current frame.
 	 *
@@ -35,7 +39,7 @@ public:
 	 *
 	 * \param fps The desired frames rendered per second.
 	 */
-	void set_fps(int fps);
+	void set_target_fps(int fps);
 
 	/**
 	 * \brief Get the current frames per second (FPS).
@@ -45,19 +49,21 @@ public:
 	int get_fps() const;
 
 	/**
-	 * \brief Get the current game scale.
+	 * \brief Get the current time scale.
 	 *
-	 * \return The current game scale, where 0 = paused, 1 = normal speed, and values > 1 speed
+	 * \return The current time scale, where (0 = pause, < 1 = slow down, 1 = normal speed, > 1 = speed up).
 	 * up the game.
 	 */
-	double get_game_scale() const;
+	double get_time_scale() const;
 
 	/**
-	 * \brief Set the game scale.
+	 * \brief Set the time scale.
 	 *
-	 * \param game_scale The desired game scale (0 = pause, 1 = normal speed, > 1 = speed up).
+	 * time_scale is a value that changes the delta time that can be retrieved using get_delta_time function. 
+	 * 
+	 * \param time_scale The desired time scale (0 = pause, < 1 = slow down, 1 = normal speed, > 1 = speed up).
 	 */
-	void set_game_scale(double game_scale);
+	void set_time_scale(double time_scale);
 
 private:
 	friend class LoopManager;
@@ -68,7 +74,6 @@ private:
 	 * Initializes the timer to begin tracking frame times.
 	 */
 	void start();
-
 	/**
 	 * \brief Enforce the frame rate limit.
 	 *
@@ -98,13 +103,6 @@ private:
 	double get_lag() const;
 
 	/**
-	 * \brief Construct a new LoopTimer object.
-	 *
-	 * Private constructor for singleton pattern to restrict instantiation outside the class.
-	 */
-	LoopTimer();
-
-	/**
 	 * \brief Update the timer to the current frame.
 	 *
 	 * Calculates and updates the delta time for the current frame and adds it to the cumulative
@@ -121,16 +119,19 @@ private:
 	void advance_fixed_update();
 
 private:
-	//! Current frames per second
-	int fps = 50;
-	//! Current game scale
-	double game_scale = 1;
+	//! Target frames per second
+	int target_fps = 50;
+	//! Actual frames per second
+	int actual_fps = 0;
+	//! time scale for speeding up or slowing down the game (0 = pause, < 1 = slow down, 1 = normal speed, > 1 = speed up)
+	double time_scale = 1;
 	//! Maximum delta time in seconds to avoid large jumps
 	std::chrono::duration<double> maximum_delta_time{0.25};
 	//! Delta time for the current frame in seconds
 	std::chrono::duration<double> delta_time{0.0};
 	//! Target time per frame in seconds
-	std::chrono::duration<double> frame_target_time = std::chrono::duration<double>(1.0) / fps;
+	std::chrono::duration<double> frame_target_time
+		= std::chrono::duration<double>(1.0) / target_fps;
 	//! Fixed delta time for fixed updates in seconds
 	std::chrono::duration<double> fixed_delta_time = std::chrono::duration<double>(1.0) / 50.0;
 	//! Total elapsed game time in seconds
diff --git a/src/crepe/manager/Mediator.h b/src/crepe/manager/Mediator.h
index 8094d80..987f4d4 100644
--- a/src/crepe/manager/Mediator.h
+++ b/src/crepe/manager/Mediator.h
@@ -4,15 +4,16 @@
 
 // TODO: remove these singletons:
 #include "../facade/SDLContext.h"
-#include "EventManager.h"
+//#include "EventManager.h"
 #include "SaveManager.h"
-#include "api/LoopTimer.h"
+//#include "LoopTimerManager.h"
 
 namespace crepe {
 
 class ComponentManager;
 class SceneManager;
-
+class LoopTimerManager;
+class EventManager;
 /**
  * Struct to pass references to classes that would otherwise need to be singletons down to
  * other classes within the engine hierarchy. Made to prevent constant changes to subclasses to
@@ -28,10 +29,10 @@ class SceneManager;
 struct Mediator {
 	OptionalRef<ComponentManager> component_manager;
 	OptionalRef<SceneManager> scene_manager;
+	OptionalRef<EventManager> event_manager;
+	OptionalRef<LoopTimerManager> loop_timer;
 	OptionalRef<SaveManager> save_manager = SaveManager::get_instance();
-	OptionalRef<EventManager> event_manager = EventManager::get_instance();
 	OptionalRef<SDLContext> sdl_context = SDLContext::get_instance();
-	OptionalRef<LoopTimer> timer = LoopTimer::get_instance();
 };
 
 } // namespace crepe
diff --git a/src/crepe/system/AnimatorSystem.cpp b/src/crepe/system/AnimatorSystem.cpp
index 549c35d..499f618 100644
--- a/src/crepe/system/AnimatorSystem.cpp
+++ b/src/crepe/system/AnimatorSystem.cpp
@@ -2,7 +2,7 @@
 
 #include "../api/Animator.h"
 #include "../manager/ComponentManager.h"
-#include "api/LoopTimer.h"
+#include "../manager/LoopTimerManager.h"
 
 #include "AnimatorSystem.h"
 
@@ -10,7 +10,7 @@ using namespace crepe;
 
 void AnimatorSystem::update() {
 	ComponentManager & mgr = this->mediator.component_manager;
-	LoopTimer & timer = this->mediator.timer;
+	LoopTimerManager & timer = this->mediator.loop_timer;
 	RefVector<Animator> animations = mgr.get_components_by_type<Animator>();
 
 	double elapsed_time = timer.get_current_time();
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
index c9cbac5..1c963d8 100644
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -13,6 +13,9 @@ target_sources(test_main PUBLIC
 	ValueBrokerTest.cpp
 	DBTest.cpp
 	Vector2Test.cpp
+	LoopManagerTest.cpp
+	LoopTimerTest.cpp
+	
 	InputTest.cpp
 	ScriptEventTest.cpp
 	ScriptSceneTest.cpp
diff --git a/src/test/CollisionTest.cpp b/src/test/CollisionTest.cpp
index dd45eb6..5dbc670 100644
--- a/src/test/CollisionTest.cpp
+++ b/src/test/CollisionTest.cpp
@@ -50,6 +50,7 @@ public:
 class CollisionTest : public Test {
 public:
 	Mediator m;
+	EventManager event_mgr{m};
 	ComponentManager mgr{m};
 	CollisionSystem collision_sys{m};
 	ScriptSystem script_sys{m};
diff --git a/src/test/EventTest.cpp b/src/test/EventTest.cpp
index 4a4872d..8479998 100644
--- a/src/test/EventTest.cpp
+++ b/src/test/EventTest.cpp
@@ -1,56 +1,41 @@
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
-
 #include <crepe/api/Event.h>
-#include <crepe/api/IKeyListener.h>
-#include <crepe/api/IMouseListener.h>
 #include <crepe/manager/EventManager.h>
-
+#include <crepe/manager/Mediator.h>
 using namespace std;
 using namespace std::chrono_literals;
 using namespace crepe;
 
 class EventManagerTest : public ::testing::Test {
 protected:
+	Mediator mediator;
+	EventManager event_mgr{mediator};
 	void SetUp() override {
 		// Clear any existing subscriptions or events before each test
-		EventManager::get_instance().clear();
+		event_mgr.clear();
 	}
 
 	void TearDown() override {
 		// Ensure cleanup after each test
-		EventManager::get_instance().clear();
+		event_mgr.clear();
 	}
 };
-class MockKeyListener : public IKeyListener {
-public:
-	MOCK_METHOD(bool, on_key_pressed, (const KeyPressEvent & event), (override));
-	MOCK_METHOD(bool, on_key_released, (const KeyReleaseEvent & event), (override));
-};
-
-class MockMouseListener : public IMouseListener {
-public:
-	MOCK_METHOD(bool, on_mouse_clicked, (const MouseClickEvent & event), (override));
-	MOCK_METHOD(bool, on_mouse_pressed, (const MousePressEvent & event), (override));
-	MOCK_METHOD(bool, on_mouse_released, (const MouseReleaseEvent & event), (override));
-	MOCK_METHOD(bool, on_mouse_moved, (const MouseMoveEvent & event), (override));
-};
-
 TEST_F(EventManagerTest, EventSubscription) {
 	EventHandler<KeyPressEvent> key_handler = [](const KeyPressEvent & e) { return true; };
 
 	// Subscribe to KeyPressEvent
-	EventManager::get_instance().subscribe<KeyPressEvent>(key_handler, 1);
+	event_mgr.subscribe<KeyPressEvent>(key_handler, 1);
 
 	// Verify subscription (not directly verifiable; test by triggering event)
 
-	EventManager::get_instance().trigger_event<KeyPressEvent>(
+	event_mgr.trigger_event<KeyPressEvent>(
 		KeyPressEvent{
 			.repeat = true,
 			.key = Keycode::A,
 		},
 		1);
-	EventManager::get_instance().trigger_event<KeyPressEvent>(
+	event_mgr.trigger_event<KeyPressEvent>(
 		KeyPressEvent{
 			.repeat = true,
 			.key = Keycode::A,
@@ -68,12 +53,12 @@ TEST_F(EventManagerTest, EventManagerTest_trigger_all_channels) {
 		EXPECT_EQ(e.button, MouseButton::LEFT_MOUSE);
 		return false;
 	};
-	EventManager::get_instance().subscribe<MouseClickEvent>(mouse_handler,
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler,
 															EventManager::CHANNEL_ALL);
 
 	MouseClickEvent click_event{
 		.mouse_x = 100, .mouse_y = 200, .button = MouseButton::LEFT_MOUSE};
-	EventManager::get_instance().trigger_event<MouseClickEvent>(click_event,
+	event_mgr.trigger_event<MouseClickEvent>(click_event,
 																EventManager::CHANNEL_ALL);
 
 	EXPECT_TRUE(triggered);
@@ -88,19 +73,18 @@ TEST_F(EventManagerTest, EventManagerTest_trigger_one_channel) {
 		EXPECT_EQ(e.button, MouseButton::LEFT_MOUSE);
 		return false;
 	};
-	EventManager::get_instance().subscribe<MouseClickEvent>(mouse_handler, test_channel);
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler, test_channel);
 
 	MouseClickEvent click_event{
 		.mouse_x = 100, .mouse_y = 200, .button = MouseButton::LEFT_MOUSE};
-	EventManager::get_instance().trigger_event<MouseClickEvent>(click_event,
+	event_mgr.trigger_event<MouseClickEvent>(click_event,
 																EventManager::CHANNEL_ALL);
 
 	EXPECT_FALSE(triggered);
-	EventManager::get_instance().trigger_event<MouseClickEvent>(click_event, test_channel);
+	event_mgr.trigger_event<MouseClickEvent>(click_event, test_channel);
 }
 
 TEST_F(EventManagerTest, EventManagerTest_callback_propagation) {
-	EventManager & event_manager = EventManager::get_instance();
 
 	// Flags to track handler calls
 	bool triggered_true = false;
@@ -126,11 +110,11 @@ TEST_F(EventManagerTest, EventManagerTest_callback_propagation) {
 	// Test event
 	MouseClickEvent click_event{
 		.mouse_x = 100, .mouse_y = 200, .button = MouseButton::LEFT_MOUSE};
-	event_manager.subscribe<MouseClickEvent>(mouse_handler_true, EventManager::CHANNEL_ALL);
-	event_manager.subscribe<MouseClickEvent>(mouse_handler_false, EventManager::CHANNEL_ALL);
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler_true, EventManager::CHANNEL_ALL);
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler_false, EventManager::CHANNEL_ALL);
 
 	// Trigger event
-	event_manager.trigger_event<MouseClickEvent>(click_event, EventManager::CHANNEL_ALL);
+	event_mgr.trigger_event<MouseClickEvent>(click_event, EventManager::CHANNEL_ALL);
 
 	// Check that only the true handler was triggered
 	EXPECT_TRUE(triggered_true);
@@ -139,12 +123,12 @@ TEST_F(EventManagerTest, EventManagerTest_callback_propagation) {
 	// Reset and clear
 	triggered_true = false;
 	triggered_false = false;
-	event_manager.clear();
-	event_manager.subscribe<MouseClickEvent>(mouse_handler_false, EventManager::CHANNEL_ALL);
-	event_manager.subscribe<MouseClickEvent>(mouse_handler_true, EventManager::CHANNEL_ALL);
+	event_mgr.clear();
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler_false, EventManager::CHANNEL_ALL);
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler_true, EventManager::CHANNEL_ALL);
 
 	// Trigger event again
-	event_manager.trigger_event<MouseClickEvent>(click_event, EventManager::CHANNEL_ALL);
+	event_mgr.trigger_event<MouseClickEvent>(click_event, EventManager::CHANNEL_ALL);
 
 	// Check that both handlers were triggered
 	EXPECT_TRUE(triggered_true);
@@ -152,47 +136,37 @@ TEST_F(EventManagerTest, EventManagerTest_callback_propagation) {
 }
 
 TEST_F(EventManagerTest, EventManagerTest_queue_dispatch) {
-	EventManager & event_manager = EventManager::get_instance();
 	bool triggered1 = false;
 	bool triggered2 = false;
 	int test_channel = 1;
-
-	// Adjusted to use KeyPressEvent with repeat as the first variable
-	EventHandler<KeyPressEvent> key_handler1 = [&](const KeyPressEvent & e) {
+	EventHandler<MouseClickEvent> mouse_handler1 = [&](const MouseClickEvent & e) {
 		triggered1 = true;
-		EXPECT_EQ(e.repeat, false); // Expecting repeat to be false
-		EXPECT_EQ(e.key, Keycode::A); // Adjust expected key code
+		EXPECT_EQ(e.mouse_x, 100);
+		EXPECT_EQ(e.mouse_y, 200);
+		EXPECT_EQ(e.button, MouseButton::LEFT_MOUSE);
 		return false; // Allows propagation
 	};
-
-	EventHandler<KeyPressEvent> key_handler2 = [&](const KeyPressEvent & e) {
+	EventHandler<MouseClickEvent> mouse_handler2 = [&](const MouseClickEvent & e) {
 		triggered2 = true;
-		EXPECT_EQ(e.repeat, false); // Expecting repeat to be false
-		EXPECT_EQ(e.key, Keycode::A); // Adjust expected key code
+		EXPECT_EQ(e.mouse_x, 100);
+		EXPECT_EQ(e.mouse_y, 200);
+		EXPECT_EQ(e.button, MouseButton::LEFT_MOUSE);
 		return false; // Allows propagation
 	};
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler1);
+	event_mgr.subscribe<MouseClickEvent>(mouse_handler2, test_channel);
 
-	// Subscribe handlers to KeyPressEvent
-	event_manager.subscribe<KeyPressEvent>(key_handler1);
-	event_manager.subscribe<KeyPressEvent>(key_handler2, test_channel);
-
-	// Queue a KeyPressEvent instead of KeyDownEvent
-	event_manager.queue_event<KeyPressEvent>(KeyPressEvent{
-		.repeat = false, .key = Keycode::A}); // Adjust event with repeat flag first
-
-	event_manager.queue_event<KeyPressEvent>(
-		KeyPressEvent{.repeat = false,
-					  .key = Keycode::A}, // Adjust event for second subscription
+	event_mgr.queue_event<MouseClickEvent>(
+		MouseClickEvent{.mouse_x = 100, .mouse_y = 200, .button = MouseButton::LEFT_MOUSE});
+	event_mgr.queue_event<MouseClickEvent>(
+		MouseClickEvent{.mouse_x = 100, .mouse_y = 200, .button = MouseButton::LEFT_MOUSE},
 		test_channel);
-
-	event_manager.dispatch_events();
-
+	event_mgr.dispatch_events();
 	EXPECT_TRUE(triggered1);
 	EXPECT_TRUE(triggered2);
 }
 
 TEST_F(EventManagerTest, EventManagerTest_unsubscribe) {
-	EventManager & event_manager = EventManager::get_instance();
 
 	// Flags to track if handlers are triggered
 	bool triggered1 = false;
@@ -215,15 +189,15 @@ TEST_F(EventManagerTest, EventManagerTest_unsubscribe) {
 		return false; // Allows propagation
 	};
 	// Subscribe handlers
-	subscription_t handler1_id = event_manager.subscribe<MouseClickEvent>(mouse_handler1);
-	subscription_t handler2_id = event_manager.subscribe<MouseClickEvent>(mouse_handler2);
+	subscription_t handler1_id = event_mgr.subscribe<MouseClickEvent>(mouse_handler1);
+	subscription_t handler2_id = event_mgr.subscribe<MouseClickEvent>(mouse_handler2);
 
 	// Queue events
-	event_manager.queue_event<MouseClickEvent>(
+	event_mgr.queue_event<MouseClickEvent>(
 		MouseClickEvent{.mouse_x = 100, .mouse_y = 200, .button = MouseButton::LEFT_MOUSE});
 
 	// Dispatch events - both handlers should be triggered
-	event_manager.dispatch_events();
+	event_mgr.dispatch_events();
 	EXPECT_TRUE(triggered1); // Handler 1 should be triggered
 	EXPECT_TRUE(triggered2); // Handler 2 should be triggered
 
@@ -232,14 +206,14 @@ TEST_F(EventManagerTest, EventManagerTest_unsubscribe) {
 	triggered2 = false;
 
 	// Unsubscribe handler1
-	event_manager.unsubscribe(handler1_id);
+	event_mgr.unsubscribe(handler1_id);
 
 	// Queue the same event again
-	event_manager.queue_event<MouseClickEvent>(
+	event_mgr.queue_event<MouseClickEvent>(
 		MouseClickEvent{.mouse_x = 100, .mouse_y = 200, .button = MouseButton::LEFT_MOUSE});
 
 	// Dispatch events - only handler 2 should be triggered, handler 1 should NOT
-	event_manager.dispatch_events();
+	event_mgr.dispatch_events();
 	EXPECT_FALSE(triggered1); // Handler 1 should NOT be triggered
 	EXPECT_TRUE(triggered2); // Handler 2 should be triggered
 
@@ -247,14 +221,14 @@ TEST_F(EventManagerTest, EventManagerTest_unsubscribe) {
 	triggered2 = false;
 
 	// Unsubscribe handler2
-	event_manager.unsubscribe(handler2_id);
+	event_mgr.unsubscribe(handler2_id);
 
 	// Queue the event again
-	event_manager.queue_event<MouseClickEvent>(
+	event_mgr.queue_event<MouseClickEvent>(
 		MouseClickEvent{.mouse_x = 100, .mouse_y = 200, .button = MouseButton::LEFT_MOUSE});
 
 	// Dispatch events - no handler should be triggered
-	event_manager.dispatch_events();
+	event_mgr.dispatch_events();
 	EXPECT_FALSE(triggered1); // Handler 1 should NOT be triggered
 	EXPECT_FALSE(triggered2); // Handler 2 should NOT be triggered
 }
diff --git a/src/test/InputTest.cpp b/src/test/InputTest.cpp
index a7c0157..bf08a04 100644
--- a/src/test/InputTest.cpp
+++ b/src/test/InputTest.cpp
@@ -26,8 +26,7 @@ public:
 	ComponentManager mgr{mediator};
 
 	InputSystem input_system{mediator};
-
-	EventManager & event_manager = EventManager::get_instance();
+	EventManager event_manager{mediator};
 	//GameObject camera;
 
 protected:
diff --git a/src/test/LoopManagerTest.cpp b/src/test/LoopManagerTest.cpp
new file mode 100644
index 0000000..13a0ada
--- /dev/null
+++ b/src/test/LoopManagerTest.cpp
@@ -0,0 +1,67 @@
+#include <chrono>
+#include <gtest/gtest.h>
+#include <gmock/gmock.h>
+#include <thread>
+#define private public
+#define protected public
+#include <crepe/api/LoopManager.h>
+#include <crepe/manager/LoopTimerManager.h>
+#include <crepe/manager/EventManager.h>
+using namespace std::chrono;
+using namespace crepe;
+
+class LoopManagerTest : public ::testing::Test {
+protected:
+    class TestGameLoop : public crepe::LoopManager {
+    public:
+    	MOCK_METHOD(void, fixed_update, (), (override));
+        MOCK_METHOD(void, update, (), (override));
+		MOCK_METHOD(void, render, (), (override));
+    };
+
+    TestGameLoop test_loop;
+    void SetUp() override {
+		
+    }
+};
+
+TEST_F(LoopManagerTest, FixedUpdate) {
+    // Arrange
+    test_loop.loop_timer.set_target_fps(60);
+
+    // Set expectations for the mock calls
+    EXPECT_CALL(test_loop, render).Times(::testing::Exactly(60)); 
+	EXPECT_CALL(test_loop, update).Times(::testing::Exactly(60));
+    EXPECT_CALL(test_loop, fixed_update).Times(::testing::Exactly(50));
+
+    // Start the loop in a separate thread
+    std::thread loop_thread([&]() { test_loop.start(); });
+
+    // Let the loop run for exactly 1 second
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+
+    // Stop the game loop
+    test_loop.game_running = false;
+    // Wait for the loop thread to finish
+    loop_thread.join();
+
+    // Test finished
+}
+TEST_F(LoopManagerTest, ShutDown) {
+    // Arrange
+    test_loop.loop_timer.set_target_fps(60);
+
+	EXPECT_CALL(test_loop, render).Times(::testing::AtLeast(1)); 
+	EXPECT_CALL(test_loop, update).Times(::testing::AtLeast(1));
+    EXPECT_CALL(test_loop, fixed_update).Times(::testing::AtLeast(1));
+    // Start the loop in a separate thread
+    std::thread loop_thread([&]() { test_loop.start(); });
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+	test_loop.event_manager.trigger_event<ShutDownEvent>(ShutDownEvent{});
+    // Wait for the loop thread to finish
+    loop_thread.join();
+
+    // Test finished
+}
+
+
diff --git a/src/test/LoopTimerTest.cpp b/src/test/LoopTimerTest.cpp
new file mode 100644
index 0000000..09b4e00
--- /dev/null
+++ b/src/test/LoopTimerTest.cpp
@@ -0,0 +1,75 @@
+#include <chrono>
+#include <thread>
+#include <gtest/gtest.h>
+#define private public
+#define protected public
+#include <crepe/manager/LoopTimerManager.h>
+#include <crepe/manager/Mediator.h>
+using namespace std::chrono;
+using namespace crepe;
+
+class LoopTimerTest : public ::testing::Test {
+protected:
+	Mediator mediator;
+	LoopTimerManager loop_timer{mediator};
+
+	void SetUp() override { loop_timer.start(); }
+};
+TEST_F(LoopTimerTest, EnforcesTargetFrameRate) {
+	// Set the target FPS to 60 (which gives a target time per frame of ~16.67 ms)
+	loop_timer.set_target_fps(60);
+
+	auto start_time = steady_clock::now();
+	loop_timer.enforce_frame_rate();
+
+	auto elapsed_time = steady_clock::now() - start_time;
+	auto elapsed_ms = duration_cast<milliseconds>(elapsed_time).count();
+
+	// For 60 FPS, the target frame time is around 16.67ms
+	ASSERT_NEAR(elapsed_ms,16.7,1);
+}
+TEST_F(LoopTimerTest, SetTargetFps) {
+	// Set the target FPS to 120
+	loop_timer.set_target_fps(120);
+
+	// Calculate the expected frame time (~8.33ms per frame)
+	auto expected_frame_time = std::chrono::duration<double>(1.0 / 120.0);
+
+	ASSERT_NEAR(loop_timer.frame_target_time.count(), expected_frame_time.count(), 0.001);
+}
+TEST_F(LoopTimerTest, DeltaTimeCalculation) {
+	// Set the target FPS to 60 (16.67 ms per frame)
+	loop_timer.set_target_fps(60);
+
+	auto start_time = steady_clock::now();
+	loop_timer.update();
+	auto end_time = steady_clock::now();
+
+	// Check the delta time
+	double delta_time = loop_timer.get_delta_time();
+
+	auto elapsed_time = duration_cast<seconds>(end_time - start_time).count();
+
+	// Assert that delta_time is close to the elapsed time
+	ASSERT_NEAR(delta_time, elapsed_time, 1);
+}
+
+TEST_F(LoopTimerTest, getCurrentTime) {
+	// Set the target FPS to 60 (16.67 ms per frame)
+	loop_timer.set_target_fps(60);
+
+	auto start_time = steady_clock::now();
+
+	// Sleep
+	std::this_thread::sleep_for(std::chrono::milliseconds(100));
+
+	loop_timer.update();
+
+	auto end_time = steady_clock::now();
+
+	// Get the elapsed time in seconds as a double
+	auto elapsed_time
+		= duration_cast<std::chrono::duration<double>>(end_time - start_time).count();
+
+	ASSERT_NEAR(loop_timer.get_current_time(), elapsed_time, 0.001);
+}
diff --git a/src/test/ScriptTest.h b/src/test/ScriptTest.h
index 1bbfdd3..ee68c23 100644
--- a/src/test/ScriptTest.h
+++ b/src/test/ScriptTest.h
@@ -7,7 +7,7 @@
 #include <crepe/api/Script.h>
 #include <crepe/manager/ComponentManager.h>
 #include <crepe/system/ScriptSystem.h>
-
+#include <crepe/manager/EventManager.h>
 class ScriptTest : public testing::Test {
 protected:
 	crepe::Mediator mediator;
@@ -15,7 +15,7 @@ protected:
 public:
 	crepe::ComponentManager component_manager{mediator};
 	crepe::ScriptSystem system{mediator};
-
+	crepe::EventManager event_mgr{mediator};
 	class MyScript : public crepe::Script {
 		// NOTE: explicitly stating `public:` is not required on actual scripts