Uses original method to get remote tips, and overload which takes credentials when username and password are present

Author: graemefoster

GitVersionCore/BuildServers/GitHelper.cs

@@ -1,5 +1,6 @@
 namespace GitVersion
 {
+    using System.Collections.Generic;
     using System.Linq;
     using LibGit2Sharp;
 
@@ -73,12 +74,10 @@ static FetchOptions BuildFetchOptions(string username, string password)
         static void CreateFakeBranchPointingAtThePullRequestTip(Repository repo, Arguments arguments)
         {
             var remote = repo.Network.Remotes.Single();
-            var credentials = string.IsNullOrEmpty(arguments.Username) ? (Credentials) new DefaultCredentials() : new UsernamePasswordCredentials()
-            {
-                Username = arguments.Username,
-                Password = arguments.Password
-            };
-            var remoteTips = repo.Network.ListReferences(remote, credentials);
+
+            var remoteTips = string.IsNullOrEmpty(arguments.Username) ?
+                GetRemoteTipsForAnonymousUser(repo, remote) :
+                GetRemoteTipsUsingUsernamePasswordCredentials(repo, remote, arguments.Username, arguments.Password);
 
             var headTipSha = repo.Head.Tip.Sha;
 
@@ -115,6 +114,21 @@ static void CreateFakeBranchPointingAtThePullRequestTip(Repository repo, Argumen
             repo.Checkout(fakeBranchName);
         }
 
+        static IEnumerable<DirectReference> GetRemoteTipsUsingUsernamePasswordCredentials(Repository repo, Remote remote, string username, string password)
+        {
+            return repo.Network.ListReferences(remote,
+                new UsernamePasswordCredentials
+                {
+                    Username = username,
+                    Password = password
+                });
+        }
+
+        static IEnumerable<DirectReference> GetRemoteTipsForAnonymousUser(Repository repo, Remote remote)
+        {
+            return repo.Network.ListReferences(remote);
+        }
+
         static void CreateMissingLocalBranchesFromRemoteTrackingOnes(Repository repo, string remoteName)
         {
             var prefix = string.Format("refs/remotes/{0}/", remoteName);