Add task diff for testing.

greenmine/projects/tasks/serializers.py

@@ -48,7 +48,6 @@ class TaskSerializer(serializers.ModelSerializer):
         diff_list = []
         current = None
 
-        if obj:
         for version in reversed(list(reversion.get_for_object(obj))):
             if current:
                 task_diff = self.get_task_diff(current, version)

greenmine/projects/tasks/tests/tests_api.py

@@ -6,6 +6,8 @@ from django import test
 from django.core import mail
 from django.core.urlresolvers import reverse
 
+import reversion
+
 from greenmine.base.users.tests import create_user
 from greenmine.projects.tests import create_project, add_membership
 from greenmine.projects.milestones.tests import create_milestone
@@ -93,6 +95,16 @@ class TasksTestCase(test.TestCase):
         response = self.client.login(username=self.user1.username,
                                      password=self.user1.username)
         self.assertTrue(response)
+
+        # Change task for generate history/diff.
+        with reversion.create_revision():
+            self.task1.tags = ["LL"]
+            self.task1.save()
+
+        with reversion.create_revision():
+            self.task1.tags = ["LLKK"]
+            self.task1.save()
+
         response = self.client.get(reverse("tasks-detail", args=(self.task1.id,)))
         self.assertEqual(response.status_code, 200)
         self.client.logout()