include all expected instance vars for _show.html.haml template within tests

app/views/projects/notes/_notes_with_form.html.haml

@@ -20,4 +20,4 @@
           to post a comment
 
 :javascript
-  var notes = new Notes("#{namespace_project_notes_path(namespace_id: @project.namespace, target_id: @noteable.id, target_type: @noteable.class.name.underscore)}", #{@notes.map(&:id).to_json}, #{Time.now.to_i}, "#{diff_view}")
+  var notes = new Notes("#{namespace_project_notes_path(namespace_id: @project.namespace, project_id: @project, target_id: @noteable.id, target_type: @noteable.class.name.underscore)}", #{@notes.map(&:id).to_json}, #{Time.now.to_i}, "#{diff_view}")

spec/views/projects/merge_requests/show.html.haml_spec.rb

@@ -7,6 +7,7 @@ describe 'projects/merge_requests/show.html.haml' do
   let(:project) { create(:project) }
   let(:fork_project) { create(:project, forked_from_project: project) }
   let(:unlink_project) { Projects::UnlinkForkService.new(fork_project, user) }
+  let(:note) { create(:note_on_merge_request, project: project, noteable: closed_merge_request) }
 
   let(:closed_merge_request) do
     create(:closed_merge_request,
@@ -19,8 +20,12 @@ describe 'projects/merge_requests/show.html.haml' do
     assign(:project, project)
     assign(:merge_request, closed_merge_request)
     assign(:commits_count, 0)
+    assign(:note, note)
+    assign(:noteable, closed_merge_request)
+    assign(:notes, [])
+    assign(:pipelines, Ci::Pipeline.none)
 
-    allow(view).to receive(:can?).and_return(true)
+    allow(view).to receive_messages(current_user: user, can?: true)
   end
 
   context 'when the merge request is closed' do