use NotificationService for handle notify logic when MR created

app/observers/merge_request_observer.rb

@@ -2,9 +2,7 @@ class MergeRequestObserver < ActiveRecord::Observer
   cattr_accessor :current_user
   def after_create(merge_request)
-    if merge_request.assignee && merge_request.assignee != current_user
-      Notify.delay.new_merge_request_email(merge_request.id)
-    end
+    notification.new_merge_request(merge_request, current_user)
   end
   def after_close(merge_request, transition)

app/services/notification_service.rb

@@ -47,7 +47,7 @@ class NotificationService
     end
   end
-  # When we reassign an issue we should send next emails:
+  # When create an issue we should send next emails:
   #
   #  * issue assignee if his notification level is not Disabled
   #
@@ -56,4 +56,14 @@ class NotificationService
       Notify.delay.new_issue_email(issue.id)
     end
   end
+
+  # When create a merge request we should send next emails:
+  #
+  #  * mr assignee if his notification level is not Disabled
+  #
+  def new_merge_request(merge_request, current_user)
+    if merge_request.assignee && merge_request.assignee != current_user
+      Notify.delay.new_merge_request_email(merge_request.id)
+    end
+  end
 end

spec/observers/merge_request_observer_spec.rb

@@ -10,7 +10,8 @@ describe MergeRequestObserver do
   let(:closed_assigned_mr)   { create(:closed_merge_request, assignee: assignee, author: author) }
   let(:closed_unassigned_mr) { create(:closed_merge_request, author: author) }
-  before(:each) { subject.stub(:current_user).and_return(some_user) }
+  before { subject.stub(:current_user).and_return(some_user) }
+  before { subject.stub(notification: mock('NotificationService').as_null_object) }
   subject { MergeRequestObserver.instance }
@@ -18,21 +19,11 @@ describe MergeRequestObserver do
     it 'is called when a merge request is created' do
       subject.should_receive(:after_create)
-
-      MergeRequest.observers.enable :merge_request_observer do
-        create(:merge_request, project: create(:project))
-      end
+      create(:merge_request, project: create(:project))
     end
-    it 'sends an email to the assignee' do
-      Notify.should_receive(:new_merge_request_email).with(mr_mock.id)
-      subject.after_create(mr_mock)
-    end
-
-    it 'does not send an email to the assignee if assignee created the merge request' do
-      subject.stub(:current_user).and_return(assignee)
-      Notify.should_not_receive(:new_merge_request_email)
-
+    it 'trigger notification service' do
+      subject.should_receive(:notification)
       subject.after_create(mr_mock)
     end
   end

spec/services/notification_service_spec.rb

@@ -44,4 +44,20 @@ describe NotificationService do
       end
     end
   end
+
+  describe 'Merge Requests' do
+    let(:merge_request) { create :merge_request, assignee: create(:user) }
+
+    describe :new_merge_request do
+      it 'should send email to merge_request assignee' do
+        Notify.should_receive(:new_merge_request_email).with(merge_request.id)
+        notification.new_merge_request(merge_request, merge_request.author)
+      end
+
+      it 'should not send email to merge_request assignee if he is current_user' do
+        Notify.should_not_receive(:new_merge_request_email).with(merge_request.id)
+        notification.new_merge_request(merge_request, merge_request.assignee)
+      end
+    end
+  end
 end