Added some tests for ThreadCount

test/Microsoft.AspNet.Server.KestrelTests/KestrelServerInformationTests.cs

@@ -0,0 +1,51 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using Microsoft.AspNet.Server.Kestrel;
+using Microsoft.Extensions.Configuration;
+using Xunit;
+
+namespace Microsoft.AspNet.Server.KestrelTests
+{
+    public class KestrelServerInformationTests
+    {
+        [Fact]
+        public void SetThreadCountUsingConfiguration()
+        {
+            const int expected = 42;
+
+            var values = new Dictionary<string, string>
+            {
+                { "server.threadCount", expected.ToString() }
+            };
+
+            var configuration = new ConfigurationBuilder()
+                .AddInMemoryCollection(values)
+                .Build();
+
+            var information = new KestrelServerInformation(configuration);
+
+            Assert.Equal(expected, information.ThreadCount);
+        }
+
+        [Fact]
+        public void SetThreadCountUsingProcessorCount()
+        {
+            // Ideally we'd mock Environment.ProcessorCount to test edge cases.
+            var expected = Clamp(Environment.ProcessorCount >> 1, 1, 16);
+
+            var configuration = new ConfigurationBuilder().Build();
+
+            var information = new KestrelServerInformation(configuration);
+
+            Assert.Equal(expected, information.ThreadCount);
+        }
+
+        private static int Clamp(int value, int min, int max)
+        {
+            return value < min ? min : value > max ? max : value;
+        }
+    }
+}