intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 41 insertions, 0 deletions

diff --git a/library/cpp/monlib/counters/meter_ut.cpp b/library/cpp/monlib/counters/meter_ut.cpp
new file mode 100644
index 0000000000..b507d16fbd
--- /dev/null
+++ b/library/cpp/monlib/counters/meter_ut.cpp
@@ -0,0 +1,41 @@
+#include "meter.h"
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NMonitoring;
+
+struct TMockClock {
+    using duration = std::chrono::nanoseconds;
+    using rep = duration::rep;
+    using period = duration::period;
+    using time_point = std::chrono::time_point<TMockClock, duration>;
+
+    static time_point now() noexcept {
+        static int index = 0;
+        return index++ < 2 ? time_point() : time_point(std::chrono::seconds(10));
+    }
+};
+
+using TMockMeter = TMeterImpl<TMockClock>;
+
+Y_UNIT_TEST_SUITE(TMeterTest) {
+    Y_UNIT_TEST(StartsOutWithNoRatesOrCount) {
+        TMeter meter;
+        UNIT_ASSERT_EQUAL(meter.GetCount(), 0L);
+        UNIT_ASSERT_DOUBLES_EQUAL(meter.GetMeanRate(), 0.0, 0.0001);
+        UNIT_ASSERT_DOUBLES_EQUAL(meter.GetOneMinuteRate(), 0.0, 0.0001);
+        UNIT_ASSERT_DOUBLES_EQUAL(meter.GetFiveMinutesRate(), 0.0, 0.0001);
+        UNIT_ASSERT_DOUBLES_EQUAL(meter.GetFifteenMinutesRate(), 0.0, 0.0001);
+    }
+
+    Y_UNIT_TEST(MarksEventsAndUpdatesRatesAndCount) {
+        TMockMeter meter;
+        meter.Mark();
+        meter.Mark(2);
+        UNIT_ASSERT_EQUAL(meter.GetCount(), 3L);
+        UNIT_ASSERT_DOUBLES_EQUAL(meter.GetMeanRate(), 0.3, 0.001);
+        UNIT_ASSERT_DOUBLES_EQUAL(meter.GetOneMinuteRate(), 0.1840, 0.0001);
+        UNIT_ASSERT_DOUBLES_EQUAL(meter.GetFiveMinutesRate(), 0.1966, 0.0001);
+        UNIT_ASSERT_DOUBLES_EQUAL(meter.GetFifteenMinutesRate(), 0.1988, 0.0001);
+    }
+}