src/test/LoopManagerTest.cpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45

#include <chrono>
#include <gtest/gtest.h>
#include <thread>
#define private public
#define protected public
#include "api/LoopManager.h"
#include "api/LoopTimer.h"

using namespace std::chrono;
using namespace crepe;

class LoopManagerTest : public ::testing::Test {
protected:
	LoopManager loop_manager;

	void SetUp() override {
		// Setting up loop manager and start the loop
		loop_manager.loop_timer->set_target_fps(60);
	}
};

//Test to check if exactly 5 fixed updates are done every second (50Hz)
TEST_F(LoopManagerTest, FixedUpdate) {
	loop_manager.loop_timer->fixed_delta_time = std::chrono::milliseconds(20);
	loop_manager.loop_timer->set_target_fps(50);
	int fixed_update_count = 0;
	loop_manager.loop_timer->start();
	// 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<milliseconds>(steady_clock::now() - start_time)
		   < std::chrono::milliseconds(1000)) {
		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()) {
			fixed_update_count++;
			loop_manager.loop_timer->advance_fixed_update();
		}

		loop_manager.loop_timer->enforce_frame_rate();
	}
	ASSERT_EQ(fixed_update_count, 50);
}