it 'admin should be able to impersonate a teaching assistant with their real name' do
      stub_current_user(admin, admin.role.name, admin.role)
      allow(User).to receive(:find_by).with(name: teaching_assistant.name).and_return(teaching_assistant)
      allow(admin).to receive(:can_impersonate?).with(teaching_assistant).and_return(true)
      request.env['HTTP_REFERER'] = 'http://www.example.com'