Provide connection options to host process (#267)

* Stage changes to other machine

* Add connection options in init message

* Fix option type

test/Microsoft.SqlTools.ServiceLayer.UnitTests/ServiceHost/CapabilitiesTests.cs

@@ -0,0 +1,35 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System.Threading.Tasks;
+using Microsoft.SqlTools.Hosting.Contracts;
+using Microsoft.SqlTools.Hosting.Protocol;
+using Moq;
+using Xunit;
+
+namespace Microsoft.SqlTools.ServiceLayer.UnitTests.Capabilities
+{
+    /// <summary>
+    /// Test cases for the capabilities discovery messages
+    /// </summary>
+    public class Capabilities
+    {
+        [Fact]
+        public async Task TestCapabilities()
+        {
+            Hosting.ServiceHost host = Hosting.ServiceHost.Instance;
+            var requestContext = new Mock<RequestContext<CapabilitiesResult>>();
+            requestContext.Setup(x => x.SendResult(It.IsAny<CapabilitiesResult>())).Returns(Task.FromResult(new object()));
+            
+            await host.HandleCapabilitiesRequest(new CapabilitiesRequest
+            {
+                HostName = "Test Host", HostVersion = "1.0"
+            }, requestContext.Object);
+
+            requestContext.Verify(x => x.SendResult(It.Is<CapabilitiesResult>(
+                 i => i.Capabilities.ConnectionProvider.Options != null)));         
+        }
+    }
+}