Unit tests for issue_milestone (#878)

models/fixtures/issue.yml

@@ -19,6 +19,7 @@
   poster_id: 1
   name: issue2
   content: content2
+  milestone_id: 1
   is_closed: false
   is_pull: true
   created_unix: 946684810

models/fixtures/milestone.yml

@@ -0,0 +1,15 @@
+-
+  id: 1
+  repo_id: 1
+  name: milestone1
+  content: content1
+  is_closed: false
+  num_issues: 1
+
+-
+  id: 2
+  repo_id: 1
+  name: milestone2
+  content: content2
+  is_closed: false
+  num_issues: 0

models/fixtures/repository.yml

@@ -8,6 +8,7 @@
   num_closed_issues: 1
   num_pulls: 2
   num_closed_pulls: 0
+  num_milestones: 2
   num_watches: 2
 
 -