Added some KestrelServer tests

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

@@ -0,0 +1,82 @@
+// 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 Microsoft.AspNet.Hosting.Server;
+using Microsoft.AspNet.Http.Features;
+using Microsoft.AspNet.Server.Kestrel;
+using Microsoft.AspNet.Server.Kestrel.Infrastructure;
+using Microsoft.Extensions.Configuration;
+using Xunit;
+
+namespace Microsoft.AspNet.Server.KestrelTests
+{
+    public class KestrelServerTests
+    {
+        [Theory]
+        [InlineData(0)]
+        [InlineData(-1337)]
+        public void StartWithNonPositiveThreadCountThrows(int threadCount)
+        {
+            var server = CreateServer(configuration =>
+                new KestrelServerInformation(configuration)
+                {
+                    ThreadCount = threadCount
+                });
+
+            var exception = Assert.Throws<ArgumentOutOfRangeException>(() => StartDummyApplication(server));
+
+            Assert.Equal("threadCount", exception.ParamName);
+        }
+
+        [Fact]
+        public void StartWithInvalidAddressThrows()
+        {
+            var server = CreateServer(configuration =>
+                new KestrelServerInformation(configuration)
+                {
+                    Addresses = {"http:/asdf"}
+                });
+
+            var exception = Assert.Throws<FormatException>(() => StartDummyApplication(server));
+
+            Assert.Contains("Unrecognized listening address", exception.Message);
+        }
+
+        [Fact]
+        public void StartWithEmptyAddressesThrows()
+        {
+            var server = CreateServer(configuration =>
+            {
+                var information = new KestrelServerInformation(configuration);
+
+                information.Addresses.Clear();
+
+                return information;
+            });
+
+            var exception = Assert.Throws<InvalidOperationException>(() => StartDummyApplication(server));
+
+            Assert.Equal("No recognized listening addresses were configured.", exception.Message);
+        }
+
+        private static KestrelServer CreateServer(Func<IConfiguration, IKestrelServerInformation> serverInformationFactory)
+        {
+            var configuration = new ConfigurationBuilder().Build();
+            var information = serverInformationFactory(configuration);
+
+            var features = new FeatureCollection();
+            features.Set(information);
+
+            var lifetime = new LifetimeNotImplemented();
+            var logger = new TestKestrelTrace.TestLogger();
+
+            return new KestrelServer(features, lifetime, logger);
+        }
+
+        private static void StartDummyApplication(IServer server)
+        {
+            server.Start(new DummyApplication(context => TaskUtilities.CompletedTask));
+        }
+    }
+}