1 files changed, 75 insertions, 0 deletions
diff --git a/src/test/LoopTimerTest.cpp b/src/test/LoopTimerTest.cpp
new file mode 100644
index 0000000..c6655d9
--- /dev/null
+++ b/src/test/LoopTimerTest.cpp
@@ -0,0 +1,75 @@
+#include <chrono>
+#include <gtest/gtest.h>
+#include <thread>
+#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);
+}