openpilot is an open source driver assistance system. openpilot performs the functions of Automated Lane Centering and Adaptive Cruise Control for over 200 supported car makes and models.

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#include "catch2/catch.hpp"
#include "common/ratekeeper.h"
#include "common/timing.h"
#include "common/util.h"
TEST_CASE("RateKeeper") {
float freq = GENERATE(10, 50, 100);
RateKeeper rk("Test RateKeeper", freq);
int lags = 0;
int bad_keep_times = 0;
for (int i = 0; i < freq; ++i) {
double begin = seconds_since_boot();
util::sleep_for(util::random_int(0, 1000.0 / freq - 1));
bool lagged = rk.keepTime();
lags += lagged;
bad_keep_times += (seconds_since_boot() - begin - (1 / freq)) > 1e-3;
}
// need a tolerance here due to scheduling
REQUIRE(lags < 5);
REQUIRE(bad_keep_times < 5);
}