Unit tests for Azure scenarios (#495)

* Test firewall rule handling is able to process through the service layer

* Additional tests for authentication and the resource wrapper code

* Positive test case for CreateFirewallRule

* Fixed copyright and usings

test/Microsoft.SqlTools.ServiceLayer.UnitTests/ResourceProvider/Azure/AzureResourceWrapperTest.cs

@@ -0,0 +1,53 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+using Microsoft.Azure.Management.Sql.Models;
+using Microsoft.SqlTools.ResourceProvider.DefaultImpl;
+using Xunit;
+
+namespace Microsoft.SqlTools.ServiceLayer.UnitTests.ResourceProvider.Azure
+{
+    public class AzureResourceWrapperTest
+    {
+        [Fact]
+        public void ShouldParseResourceGroupFromId()
+        {
+            // Given a resource with a known resource group
+            TrackedResource trackedResource = CreateMockResource(
+                "/subscriptions/aaaaaaaa-1234-cccc-dddd-a1234v12c23/resourceGroups/myresourcegroup/providers/Microsoft.Sql/servers/my-server",
+                "my-server",
+                "Microsoft.Sql");
+
+            // When I get the resource group name
+            AzureResourceWrapper resource = new AzureResourceWrapper(trackedResource);
+            string rgName = resource.ResourceGroupName;
+
+            // then I get it as expected
+            Assert.Equal("myresourcegroup", rgName);
+        }
+
+        [Fact]
+        public void ShouldHandleMissingResourceGroup()
+        {
+            // Given a resource without resource group in the ID
+            TrackedResource trackedResource = CreateMockResource(
+                "/subscriptions/aaaaaaaa-1234-cccc-dddd-a1234v12c23",
+                "my-server",
+                "Microsoft.Sql");
+
+            // When I get the resource group name
+            AzureResourceWrapper resource = new AzureResourceWrapper(trackedResource);
+            string rgName = resource.ResourceGroupName;
+
+            // then I get string.Empty
+            Assert.Equal(string.Empty, rgName);
+        }
+
+        private TrackedResource CreateMockResource(string id = null, string name = null, string type = null)
+        {
+            return new TrackedResource("Somewhere", id, name, type);
+        }
+    }
+}