97 Added SPEC file for unittest coverage and also linted everything.

app/controllers/v0/average_days_for_claim_completion_controller.rb

@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 module V0
   class AverageDaysForClaimCompletionController < ApplicationController
     service_tag 'average-days-to-completion'
     skip_before_action :authenticate, only: :index
 
     def index
-      rtn = AverageDaysForClaimCompletion.order("created_at DESC").first
+      rtn = AverageDaysForClaimCompletion.order('created_at DESC').first
       render json: {
         average_days: rtn.present? ? rtn.average_days : -1.0
       }

app/models/average_days_for_claim_completion.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 class AverageDaysForClaimCompletion < ApplicationRecord
-end
+end

spec/controllers/v0/average_days_for_claim_completion_controller_spec.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe V0::AverageDaysForClaimCompletionController, type: :controller do
+  context 'when querying with nothing in db' do
+    it 'returns -1 for value' do
+      get :index
+      expect(response).to have_http_status(:ok)
+      expect(JSON.parse(response.body)['average_days']).to eq(-1.0)
+    end
+  end
+
+  context 'when querying with record in db' do
+    before do
+      AverageDaysForClaimCompletion.create(average_days: 100)
+    end
+
+    it 'returns the value' do
+      get :index
+      expect(response).to have_http_status(:ok)
+      expect(JSON.parse(response.body)['average_days']).to eq(100.0)
+    end
+  end
+
+  context 'when querying with multiple records in db' do
+    before do
+      AverageDaysForClaimCompletion.create(average_days: 100)
+      AverageDaysForClaimCompletion.create(average_days: 200)
+      AverageDaysForClaimCompletion.create(average_days: 300)
+    end
+
+    it 'returns the value' do
+      get :index
+      expect(response).to have_http_status(:ok)
+      expect(JSON.parse(response.body)['average_days']).to eq(300.0)
+    end
+  end
+end