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#include "timer.h" 
 
#include <library/cpp/testing/unittest/registar.h>
 
using namespace NMonitoring; 
using namespace std::literals::chrono_literals; 
 
class TCallback {
public:
    explicit TCallback(int value) 
        : Value_(value){}; 
    void operator()(std::chrono::high_resolution_clock::duration duration) {
        Value_ = duration.count();
    };

    int Value_;
};

Y_UNIT_TEST_SUITE(TTimerTest) {
    Y_UNIT_TEST(RecordValue) {
        TTimerNs timerNs(1ns, 1s); 
        UNIT_ASSERT(timerNs.RecordValue(10us)); 
 
        TTimerUs timerUs(1us, 1s); 
        UNIT_ASSERT(timerUs.RecordValue(10us)); 
 
        THistogramSnapshot snapshot; 
        timerNs.TakeSnapshot(&snapshot); 
        UNIT_ASSERT_EQUAL(snapshot.Min, 10000); 
        UNIT_ASSERT_EQUAL(snapshot.Max, 10007); 
        UNIT_ASSERT_DOUBLES_EQUAL(snapshot.StdDeviation, 0.0, 1e-6); 
 
        timerUs.TakeSnapshot(&snapshot); 
        UNIT_ASSERT_EQUAL(snapshot.Min, 10); 
        UNIT_ASSERT_EQUAL(snapshot.Max, 10); 
        UNIT_ASSERT_DOUBLES_EQUAL(snapshot.StdDeviation, 0.0, 1e-6); 
    } 
 
    Y_UNIT_TEST(Measure) {
        TTimerNs timer(1ns, 1s); 
        timer.Measure([]() { 
            Sleep(TDuration::MilliSeconds(1)); 
        }); 
        THistogramSnapshot snapshot; 
        timer.TakeSnapshot(&snapshot); 
 
        UNIT_ASSERT(snapshot.Min > std::chrono::nanoseconds(1ms).count()); 
        UNIT_ASSERT(snapshot.Max > std::chrono::nanoseconds(1ms).count()); 
        UNIT_ASSERT_DOUBLES_EQUAL(snapshot.StdDeviation, 0.0, 1e-6); 
    } 
 
    Y_UNIT_TEST(TimerScope) {
        TTimerUs timer(1us, 1000s); 
        { 
            TTimerScope<TTimerUs> scope(&timer); 
            Sleep(TDuration::MilliSeconds(10)); 
        } 
        THistogramSnapshot snapshot; 
        timer.TakeSnapshot(&snapshot); 
 
        UNIT_ASSERT(snapshot.Min > std::chrono::microseconds(10ms).count()); 
        UNIT_ASSERT(snapshot.Max > std::chrono::microseconds(10ms).count()); 
        UNIT_ASSERT_DOUBLES_EQUAL(snapshot.StdDeviation, 0.0, 1e-6); 
    } 

    Y_UNIT_TEST(TimerScopeWithCallback) {
        TCallback callback(0);
        TTimerUs timer(1us, 1000s);
        {
            TTimerScope<TTimerUs, TCallback> scope(&timer, &callback);
            Sleep(TDuration::MilliSeconds(10));
        }
        THistogramSnapshot snapshot;
        timer.TakeSnapshot(&snapshot);

        UNIT_ASSERT(snapshot.Min > std::chrono::microseconds(10ms).count());
        UNIT_ASSERT(snapshot.Max > std::chrono::microseconds(10ms).count());
        UNIT_ASSERT_DOUBLES_EQUAL(snapshot.StdDeviation, 0.0, 1e-6);
        UNIT_ASSERT(callback.Value_ > std::chrono::microseconds(10ms).count());
    }
}