intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 47 insertions, 0 deletions

diff --git a/library/cpp/monlib/counters/histogram_ut.cpp b/library/cpp/monlib/counters/histogram_ut.cpp
new file mode 100644
index 0000000000..5a0800505a
--- /dev/null
+++ b/library/cpp/monlib/counters/histogram_ut.cpp
@@ -0,0 +1,47 @@
+#include "histogram.h"
+
+#include <library/cpp/testing/unittest/registar.h>
+
+using namespace NMonitoring;
+
+Y_UNIT_TEST_SUITE(THistorgamTest) {
+    Y_UNIT_TEST(TakeSnapshot) {
+        THdrHistogram h(1, 10, 3);
+        UNIT_ASSERT(h.RecordValue(1));
+        UNIT_ASSERT(h.RecordValue(2));
+        UNIT_ASSERT(h.RecordValues(3, 10));
+        UNIT_ASSERT(h.RecordValue(4));
+        UNIT_ASSERT(h.RecordValue(5));
+
+        UNIT_ASSERT_EQUAL(h.GetTotalCount(), 14);
+
+        THistogramSnapshot snapshot;
+        h.TakeSnaphot(&snapshot);
+
+        UNIT_ASSERT_EQUAL(h.GetTotalCount(), 0);
+
+        UNIT_ASSERT_EQUAL(snapshot.Min, 1);
+        UNIT_ASSERT_EQUAL(snapshot.Max, 5);
+
+        // >>> a = [1, 2] + [3 for i in range(10)]  + [4, 5]
+        // >>> numpy.mean(a)
+        // 3.0
+        UNIT_ASSERT_DOUBLES_EQUAL(snapshot.Mean, 3.0, 1e-6);
+
+        // >>> numpy.std(a)
+        // 0.84515425472851657
+        UNIT_ASSERT_DOUBLES_EQUAL(snapshot.StdDeviation, 0.84515425472851657, 1e-6);
+
+        // >>> [(p, round(numpy.percentile(a, p))) for p in [50, 75, 90, 95, 98, 99, 99.9, 100]]
+        // [(50, 3.0), (75, 3.0), (90, 4.0), (95, 4.0), (98, 5.0), (99, 5.0), (99.9, 5.0), (100, 5.0)]
+        UNIT_ASSERT_EQUAL(snapshot.Percentile50, 3);
+        UNIT_ASSERT_EQUAL(snapshot.Percentile75, 3);
+        UNIT_ASSERT_EQUAL(snapshot.Percentile90, 4);
+        UNIT_ASSERT_EQUAL(snapshot.Percentile95, 4);
+        UNIT_ASSERT_EQUAL(snapshot.Percentile98, 5);
+        UNIT_ASSERT_EQUAL(snapshot.Percentile99, 5);
+        UNIT_ASSERT_EQUAL(snapshot.Percentile999, 5);
+
+        UNIT_ASSERT_EQUAL(snapshot.TotalCount, 14);
+    }
+}