Fix failing tests.

Author: grokys

src/UnitTests/Helpers/TestBaseClass.cs

@@ -58,9 +58,13 @@ protected static PullRequest CreatePullRequest(User user, int id, ItemState stat
         DateTimeOffset createdAt, DateTimeOffset updatedAt, int commentCount = 0, int reviewCommentCount = 0)
     {
         var uri = new Uri("https://url");
+        var repo = new Repository();
         return new PullRequest(uri, uri, uri, uri, uri, uri,
             id, state, title, "", createdAt, updatedAt,
-            null, null, null, null, user, null, false, null,
+            null, null, 
+            new GitReference(uri.ToString(), "foo:bar", "bar", string.Empty, user, repo),
+            new GitReference(uri.ToString(), "foo:baz", "baz", string.Empty, user, repo),
+            user, null, false, null,
             commentCount, reviewCommentCount, 0, 0, 0, 0,
             null, false);
     }