Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core.Tests/Internal/TimespecTest.cs

Index: third_party/grpc/src/csharp/Grpc.Core.Tests/Internal/TimespecTest.cs
diff --git a/third_party/grpc/src/csharp/Grpc.Core.Tests/Internal/TimespecTest.cs b/third_party/grpc/src/csharp/Grpc.Core.Tests/Internal/TimespecTest.cs
new file mode 100644
index 0000000000000000000000000000000000000000..74f7f2497a92ddee88556dd81f81a8932a221ba3
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+++ b/third_party/grpc/src/csharp/Grpc.Core.Tests/Internal/TimespecTest.cs
@@ -0,0 +1,188 @@
+#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.Runtime.InteropServices;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+
+namespace Grpc.Core.Internal.Tests
+{
+    public class TimespecTest
+    {
+        [Test]
+        public void Now_IsInUtc() 
+        {
+            Assert.AreEqual(DateTimeKind.Utc, Timespec.Now.ToDateTime().Kind);
+        }
+
+        [Test]
+        public void Now_AgreesWithUtcNow()
+        {
+            var timespec = Timespec.Now;
+            var utcNow = DateTime.UtcNow;
+
+            TimeSpan difference = utcNow - timespec.ToDateTime();
+
+            // This test is inherently a race - but the two timestamps
+            // should really be way less that a minute apart.
+            Assert.IsTrue(difference.TotalSeconds < 60);
+        }
+
+        [Test]
+        public void InfFuture()
+        {
+            var timespec = Timespec.InfFuture;
+        }
+
+        [Test]
+        public void InfPast()
+        {
+            var timespec = Timespec.InfPast;
+        }
+
+        [Test]
+        public void TimespecSizeIsNativeSize()
+        {
+            Assert.AreEqual(Timespec.NativeSize, Marshal.SizeOf(typeof(Timespec)));
+        }
+
+        [Test]
+        public void ToDateTime()
+        {
+            Assert.AreEqual(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc),
+                new Timespec(0, 0).ToDateTime());
+
+            Assert.AreEqual(new DateTime(1970, 1, 1, 0, 0, 10, DateTimeKind.Utc).AddTicks(50),
+                new Timespec(10, 5000).ToDateTime());
+
+            Assert.AreEqual(new DateTime(2015, 7, 21, 4, 21, 48, DateTimeKind.Utc),
+                new Timespec(1437452508, 0).ToDateTime());
+
+            // before epoch
+            Assert.AreEqual(new DateTime(1969, 12, 31, 23, 59, 55, DateTimeKind.Utc).AddTicks(10),
+                new Timespec(-5, 1000).ToDateTime());
+
+            // infinity
+            Assert.AreEqual(DateTime.MaxValue, Timespec.InfFuture.ToDateTime());
+            Assert.AreEqual(DateTime.MinValue, Timespec.InfPast.ToDateTime());
+
+            // nanos are rounded to ticks are rounded up
+            Assert.AreEqual(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddTicks(1),
+                new Timespec(0, 99).ToDateTime());
+
+            // Illegal inputs
+            Assert.Throws(typeof(InvalidOperationException),
+                () => new Timespec(0, -2).ToDateTime());
+            Assert.Throws(typeof(InvalidOperationException),
+                () => new Timespec(0, 1000 * 1000 * 1000).ToDateTime());
+            Assert.Throws(typeof(InvalidOperationException),
+                () => new Timespec(0, 0, GPRClockType.Monotonic).ToDateTime());
+        }
+
+        [Test]
+        public void ToDateTime_ReturnsUtc()
+        {
+            Assert.AreEqual(DateTimeKind.Utc, new Timespec(1437452508, 0).ToDateTime().Kind);
+            Assert.AreNotEqual(DateTimeKind.Unspecified, new Timespec(1437452508, 0).ToDateTime().Kind);
+        }
+
+        [Test]
+        public void ToDateTime_Overflow()
+        {     
+            var timespec = new Timespec(long.MaxValue - 100, 0);
+            Assert.AreNotEqual(Timespec.InfFuture, timespec);
+            Assert.AreEqual(DateTime.MaxValue, timespec.ToDateTime());
+
+            Assert.AreEqual(DateTime.MinValue, new Timespec(long.MinValue + 100, 0).ToDateTime());
+        }
+
+        [Test]
+        public void ToDateTime_OutOfDateTimeRange()
+        {
+            // DateTime range goes up to year 9999, 20000 years from now should
+            // be out of range.
+            long seconds = 20000L * 365L * 24L * 3600L; 
+
+            var timespec = new Timespec(seconds, 0);
+            Assert.AreNotEqual(Timespec.InfFuture, timespec);
+            Assert.AreEqual(DateTime.MaxValue, timespec.ToDateTime());
+
+            Assert.AreEqual(DateTime.MinValue, new Timespec(-seconds, 0).ToDateTime());
+        }
+
+        [Test]
+        public void FromDateTime()
+        {
+            Assert.AreEqual(new Timespec(0, 0),
+                Timespec.FromDateTime(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)));
+
+            Assert.AreEqual(new Timespec(10, 5000),
+                Timespec.FromDateTime(new DateTime(1970, 1, 1, 0, 0, 10, DateTimeKind.Utc).AddTicks(50)));
+
+            Assert.AreEqual(new Timespec(1437452508, 0),
+                Timespec.FromDateTime(new DateTime(2015, 7, 21, 4, 21, 48, DateTimeKind.Utc)));
+
+            // before epoch
+            Assert.AreEqual(new Timespec(-5, 1000),
+                Timespec.FromDateTime(new DateTime(1969, 12, 31, 23, 59, 55, DateTimeKind.Utc).AddTicks(10)));
+
+            // infinity
+            Assert.AreEqual(Timespec.InfFuture, Timespec.FromDateTime(DateTime.MaxValue));
+            Assert.AreEqual(Timespec.InfPast, Timespec.FromDateTime(DateTime.MinValue));
+
+            // illegal inputs
+            Assert.Throws(typeof(ArgumentException),
+                () => Timespec.FromDateTime(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Unspecified)));
+        }
+            
+        [Test]
+        [Category("Performance")]
+        [Ignore("Prevent running on Jenkins")]
+        public void NowBenchmark() 
+        {
+            // approx Timespec.Now latency <33ns
+            BenchmarkUtil.RunBenchmark(10000000, 1000000000, () => { var now = Timespec.Now; });
+        }
+            
+        [Test]
+        [Category("Performance")]
+        [Ignore("Prevent running on Jenkins")]
+        public void PreciseNowBenchmark()
+        {
+            // approx Timespec.PreciseNow latency <18ns (when compiled with GRPC_TIMERS_RDTSC)
+            BenchmarkUtil.RunBenchmark(10000000, 1000000000, () => { var now = Timespec.PreciseNow; });
+        }
+    }
+}