From 48d272800ebe0432e120ec95c357932a23a2cf21 Mon Sep 17 00:00:00 2001
From: Rob Golding <rob@robgolding.com>
Date: Fri, 9 Jan 2015 11:22:19 +0000
Subject: [PATCH] Add (failing) tests for appending/adding to empty lists/sets

---
 tasklib/task.py  |  2 +-
 tasklib/tests.py | 21 +++++++++++++++++++--
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/tasklib/task.py b/tasklib/task.py
index b56936e..d5913af 100644
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -95,7 +95,7 @@ class SerializingObject(object):
     def deserialize_tags(self, tags):
         if isinstance(tags, basestring):
             return tags.split(',') if tags else []
-        return tags
+        return tags or []
 
     def serialize_depends(self, cur_dependencies):
         # Return the list of uuids
diff --git a/tasklib/tests.py b/tasklib/tests.py
index f3edd61..a608cf8 100644
--- a/tasklib/tests.py
+++ b/tasklib/tests.py
@@ -245,6 +245,18 @@ class TaskTest(TasklibTest):
 
         self.assertEqual(t['depends'], set([dependency1, dependency2]))
 
+    def test_add_to_empty_dependency_set(self):
+        # Adds dependency to task with one dependencies
+        t = Task(self.tw, description="test task")
+        dependency = Task(self.tw, description="needs to be done first")
+
+        dependency.save()
+
+        t['depends'].add(dependency)
+        t.save()
+
+        self.assertEqual(t['depends'], set([dependency]))
+
     def test_simple_dependency_set_save_repeatedly(self):
         # Adds only one dependency to task with no dependencies
         t = Task(self.tw, description="test task")
@@ -416,7 +428,6 @@ class TaskTest(TasklibTest):
     def test_saving_unmodified_task(self):
         t = Task(self.tw, description="test task")
         t.save()
-        t.refresh()
         t.save()
 
     def test_adding_tag_by_appending(self):
@@ -424,9 +435,15 @@ class TaskTest(TasklibTest):
         t.save()
         t['tags'].append('test2')
         t.save()
-        t.refresh()
         self.assertEqual(t['tags'], ['test1', 'test2'])
 
+    def test_adding_tag_by_appending_empty(self):
+        t = Task(self.tw, description="test task")
+        t.save()
+        t['tags'].append('test')
+        t.save()
+        self.assertEqual(t['tags'], ['test'])
+
 
 class AnnotationTest(TasklibTest):
 
-- 
2.39.2