From d9e46281c1e24a5f23d779d314e5df87fa3317a3 Mon Sep 17 00:00:00 2001
From: WBoerenkamps <wrj.boerenkamps@student.avans.nl>
Date: Wed, 4 Dec 2024 21:33:38 +0100
Subject: tests

---
 src/test/CMakeLists.txt      |  1 +
 src/test/loopManagerTest.cpp | 50 ++++++++++++++++++++++++++++++++++++++++++++
 src/test/loopTimerTest.cpp   | 36 ++++++++++++++++++++++++++-----
 3 files changed, 82 insertions(+), 5 deletions(-)
 create mode 100644 src/test/loopManagerTest.cpp

(limited to 'src/test')

diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
index d310f6a..b126add 100644
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -12,4 +12,5 @@ target_sources(test_main PUBLIC
 	ValueBrokerTest.cpp
 	DBTest.cpp
 	Vector2Test.cpp
+	loopTimerTest.cpp
 )
diff --git a/src/test/loopManagerTest.cpp b/src/test/loopManagerTest.cpp
new file mode 100644
index 0000000..6e66ce7
--- /dev/null
+++ b/src/test/loopManagerTest.cpp
@@ -0,0 +1,50 @@
+#include <gtest/gtest.h>
+#include <chrono>
+#include <thread>
+#define private public
+#define protected public
+#include "api/LoopTimer.h"
+#include "api/LoopManager.h"
+
+using namespace std::chrono;
+using namespace crepe;
+
+class LoopTimerTest : public ::testing::Test {
+protected:
+    LoopManager loop_manager;
+
+    void SetUp() override {
+        // Setting up loop manager and start the loop
+        loop_manager.setup();
+        loop_manager.loop_timer->set_target_fps(60);
+    }
+};
+
+// Test to check if exactly 5 fixed updates are done every second (50Hz)
+TEST_F(LoopTimerTest, FixedUpdateCalledAt50Hz) {
+    // Set target fixed delta time to 20ms (50Hz fixed updates)
+    loop_manager.loop_timer->set_fixed_delta_time(milliseconds(20));
+
+    int fixed_update_count = 0;
+
+    // We want to simulate the game loop for about 1 second
+    auto start_time = steady_clock::now();
+
+    // Simulate the game loop for 1 second
+    while (duration_cast<seconds>(steady_clock::now() - start_time).count() < 1) {
+        loop_manager.loop_timer->update();
+
+        // Simulate processing fixed updates while there's lag to advance
+        while (loop_manager.loop_timer->get_lag() >= loop_manager.loop_timer->get_fixed_delta_time()) {
+            loop_manager.fixed_update();  // Process fixed update
+            fixed_update_count++;         // Count the number of fixed updates
+            loop_manager.loop_timer->advance_fixed_update();
+        }
+        
+        // We do not need to call render or update for this test
+        loop_manager.loop_timer->enforce_frame_rate();  // Enforce the frame rate (this would normally go to the display)
+    }
+
+    // We expect 5 fixed updates to occur in 1 second at 50Hz
+    ASSERT_EQ(fixed_update_count, 5);
+}
diff --git a/src/test/loopTimerTest.cpp b/src/test/loopTimerTest.cpp
index d2f7d9b..9bbbff3 100644
--- a/src/test/loopTimerTest.cpp
+++ b/src/test/loopTimerTest.cpp
@@ -1,6 +1,8 @@
 #include <gtest/gtest.h>
 #include <chrono>
 #include <thread>
+#define private public
+#define protected public
 #include "api/LoopTimer.h"
 
 using namespace std::chrono;
@@ -11,23 +13,47 @@ protected:
     LoopTimer loop_timer;
 
     void SetUp() override {
-        loop_timer.start(); // Reset loop timer before each test.
+        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);
 
-    // Simulate a short update (frame duration less than the target frame time)
     auto start_time = steady_clock::now();
-    loop_timer.enforce_frame_rate(); // Enforce the frame rate
+    loop_timer.enforce_frame_rate();
 
-    // Check that the loop timer's current time is greater than or equal to the target frame time
     auto elapsed_time = steady_clock::now() - start_time;
     auto elapsed_ms = duration_cast<milliseconds>(elapsed_time).count();
 
-    // Assert that the elapsed time is close to the target frame time
     // For 60 FPS, the target frame time is around 16.67ms
     ASSERT_GE(elapsed_ms, 16);  // Make sure it's at least 16 ms (could be slightly more)
     ASSERT_LE(elapsed_ms, 18);  // Ensure it's not too much longer
 }
+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<milliseconds>(end_time - start_time).count();
+    
+    // Assert that delta_time is close to the elapsed time
+    ASSERT_GE(delta_time, elapsed_time / 1000.0);
+    ASSERT_LE(delta_time, (elapsed_time + 2) / 1000.0);
+}
+
-- 
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