Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.IntegrationTesting/HistogramTest.cs

+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Utils;
+using Grpc.Testing;
+using NUnit.Framework;
+
+namespace Grpc.IntegrationTesting
+{
+    public class HistogramTest
+    {
+        [Test]
+        public void Simple()
+        {
+            var hist = new Histogram(0.01, 60e9);
+            hist.AddObservation(10000);
+            hist.AddObservation(10000);
+            hist.AddObservation(11000);
+            hist.AddObservation(11000);
+
+            var data = hist.GetSnapshot();
+
+            Assert.AreEqual(4, data.Count);
+            Assert.AreEqual(42000.0, data.Sum, 1e-6);
+            Assert.AreEqual(10000, data.MinSeen);
+            Assert.AreEqual(11000, data.MaxSeen);
+            Assert.AreEqual(2.0*10000*10000 + 2.0*11000*11000, data.SumOfSquares, 1e-6);
+
+            // 1.01^925 < 10000 < 1.01^926
+            Assert.AreEqual(2, data.Bucket[925]);
+            Assert.AreEqual(2, data.Bucket[935]);
+        }
+
+        [Test]
+        public void ExtremeObservations()
+        {
+            var hist = new Histogram(0.01, 60e9);
+            hist.AddObservation(-0.5);  // should be in the first bucket
+            hist.AddObservation(1e12);  // should be in the last bucket 
+
+            var data = hist.GetSnapshot();
+            Assert.AreEqual(1, data.Bucket[0]);
+            Assert.AreEqual(1, data.Bucket[data.Bucket.Count - 1]);
+        }
+
+        [Test]
+        public void Reset()
+        {
+            var hist = new Histogram(0.01, 60e9);
+            hist.AddObservation(10000);
+            hist.AddObservation(11000);
+
+            var data = hist.GetSnapshot(true);  // snapshot contains data before reset
+            Assert.AreEqual(2, data.Count);
+            Assert.AreEqual(10000, data.MinSeen);
+            Assert.AreEqual(11000, data.MaxSeen);
+
+            data = hist.GetSnapshot();  // snapshot contains state after reset
+            Assert.AreEqual(0, data.Count);
+            Assert.AreEqual(double.PositiveInfinity, data.MinSeen);
+            Assert.AreEqual(double.NegativeInfinity, data.MaxSeen);
+            Assert.AreEqual(0, data.Sum);
+            Assert.AreEqual(0, data.SumOfSquares);
+            CollectionAssert.AreEqual(new uint[data.Bucket.Count], data.Bucket); 
+        }
+    }
+}