Use proper API::Entities::Milestone

app/serializers/issue_board_entity.rb

@@ -17,7 +17,7 @@ class IssueBoardEntity < Grape::Entity
   end
 
   expose :milestone, expose_nil: false do |issue|
-    API::Entities::Project.represent issue.milestone, only: [:id, :title]
+    API::Entities::Milestone.represent issue.milestone, only: [:id, :title]
   end
 
   expose :assignees do |issue|

spec/serializers/issue_board_entity_spec.rb

@@ -6,18 +6,37 @@ describe IssueBoardEntity do
   let(:project)   { create(:project) }
   let(:resource)  { create(:issue, project: project) }
   let(:user)      { create(:user) }
-
+  let(:milestone) { create(:milestone, project: project) }
+  let(:label)     { create(:label, project: project, title: 'Test Label') }
   let(:request)   { double('request', current_user: user) }
 
   subject { described_class.new(resource, request: request).as_json }
 
   it 'has basic attributes' do
     expect(subject).to include(:id, :iid, :title, :confidential, :due_date, :project_id, :relative_position,
-                               :project, :labels)
+                               :labels, :assignees, project: hash_including(:id, :path))
   end
 
   it 'has path and endpoints' do
     expect(subject).to include(:reference_path, :real_path, :issue_sidebar_endpoint,
                                :toggle_subscription_endpoint, :assignable_labels_endpoint)
   end
+
+  it 'has milestone attributes' do
+    resource.milestone = milestone
+
+    expect(subject).to include(milestone: hash_including(:id, :title))
+  end
+
+  it 'has assignee attributes' do
+    resource.assignees = [user]
+
+    expect(subject).to include(assignees: array_including(hash_including(:id, :name, :username, :avatar_url)))
+  end
+
+  it 'has label attributes' do
+    resource.labels = [label]
+
+    expect(subject).to include(labels: array_including(hash_including(:id, :title, :color, :description, :text_color, :priority)))
+  end
 end