Next batch of code coverage tests. (#128)

Auto-merging test-only changes.  Please review the commit and I'll make changes in next iteration.

* Add more tests to boast code coverage

* Add more reliable connection tests.

test/Microsoft.SqlTools.ServiceLayer.Test/Utility/LongListTests.cs

@@ -0,0 +1,29 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.SqlTools.ServiceLayer.Utility;
+using Xunit;
+
+namespace Microsoft.SqlTools.Test.Utility
+{
+    /// <summary>
+    /// Tests for the LongList class
+    /// </summary>
+    public class LongListTests
+    {
+        /// <summary>
+        /// Add and remove and item in a LongList
+        /// </summary>
+        [Fact]
+        public void LongListTest()
+        {
+            var longList = new LongList<char>();
+            longList.Add('.');
+            Assert.True(longList.Count == 1);
+            longList.RemoveAt(0);
+            Assert.True(longList.Count == 0);
+        }
+    }
+}