Fixing issues as per suggestions from @kevcunnane

src/Microsoft.SqlTools.ServiceLayer/Connection/SqlConnectionFactory.cs

@@ -0,0 +1,26 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using System.Data.Common;
+using System.Data.SqlClient;
+
+namespace Microsoft.SqlTools.ServiceLayer.Connection
+{
+    /// <summary>
+    /// Factory class to create SqlClientConnections
+    /// The purpose of the factory is to make it easier to mock out the database
+    /// in 'offline' unit test scenarios.
+    /// </summary>
+    public class SqlConnectionFactory : ISqlConnectionFactory
+    {
+        /// <summary>
+        /// Creates a new SqlConnection object
+        /// </summary>
+        public DbConnection CreateSqlConnection(string connectionString)
+        {
+            return new SqlConnection(connectionString);
+        }
+    }
+}