Fix notify specs. Fix merge request close via api

lib/api/merge_requests.rb

@@ -94,6 +94,8 @@ module Gitlab
         authorize! :modify_merge_request, merge_request
+        MergeRequestObserver.current_user = current_user
+
         if merge_request.update_attributes attrs
           merge_request.reload_code
           merge_request.mark_as_unchecked

spec/mailers/notify_spec.rb

@@ -107,7 +107,7 @@ describe Notify do
         let(:issue) { create(:issue, assignee: assignee, project: project ) }
         describe 'that are new' do
-          subject { Notify.new_issue_email(issue.id) }
+          subject { Notify.new_issue_email(issue.assignee_id, issue.id) }
           it_behaves_like 'an assignee email'
@@ -172,7 +172,7 @@ describe Notify do
         let(:merge_request) { create(:merge_request, assignee: assignee, project: project) }
         describe 'that are new' do
-          subject { Notify.new_merge_request_email(merge_request.id) }
+          subject { Notify.new_merge_request_email(merge_request.assignee_id, merge_request.id) }
           it_behaves_like 'an assignee email'