Add survey related tests

spec/models/survey_reply_spec.rb

@@ -0,0 +1,14 @@
+require 'spec_helper'
+
+describe SurveyReply do
+  subject { create(:survey_reply) }
+
+  describe 'association' do
+    it { is_expected.to belong_to(:user) }
+    it { is_expected.to belong_to(:survey_question) }
+  end
+
+  describe 'validation' do
+    it { is_expected.to validate_uniqueness_of(:survey_question_id).scoped_to(:user_id) }
+  end
+end