Add stats API endpoint spec

spec/requests/api/v1/stats_spec.rb

@@ -1,7 +1,78 @@
+# frozen_string_literal: true
+
 require 'rails_helper'
 
-RSpec.describe "Api::V1::Stats", type: :request do
-  describe "GET /index" do
-    pending "add some examples (or delete) #{__FILE__}"
+RSpec.describe 'Api::V1::Stats', type: :request do
+  let(:user) { create(:user) }
+
+  describe 'GET /index' do
+    let!(:user) { create(:user) }
+    let!(:stats_in_2020) { create_list(:stat, 12, year: 2020, user:) }
+    let!(:stats_in_2021) { create_list(:stat, 12, year: 2021, user:) }
+    let!(:points_in_2020) { create_list(:point, 85, :with_geodata, timestamp: Time.zone.local(2020), user:) }
+    let!(:points_in_2021) { create_list(:point, 95, timestamp: Time.zone.local(2021), user:) }
+    let(:expected_json) do
+      {
+        totalDistanceKm: stats_in_2020.map(&:distance).sum + stats_in_2021.map(&:distance).sum,
+        totalPointsTracked: points_in_2020.count + points_in_2021.count,
+        totalReverseGeocodedPoints: points_in_2020.count,
+        totalCountriesVisited: 1,
+        totalCitiesVisited: 1,
+        yearlyStats: [
+          {
+            year: 2021,
+            totalDistanceKm: 12,
+            totalCountriesVisited: 1,
+            totalCitiesVisited: 1,
+            monthlyDistanceKm: {
+              january: 1,
+              february: 0,
+              march: 0,
+              april: 0,
+              may: 0,
+              june: 0,
+              july: 0,
+              august: 0,
+              september: 0,
+              october: 0,
+              november: 0,
+              december: 0
+            }
+          },
+          {
+            year: 2020,
+            totalDistanceKm: 12,
+            totalCountriesVisited: 1,
+            totalCitiesVisited: 1,
+            monthlyDistanceKm: {
+              january: 1,
+              february: 0,
+              march: 0,
+              april: 0,
+              may: 0,
+              june: 0,
+              july: 0,
+              august: 0,
+              september: 0,
+              october: 0,
+              november: 0,
+              december: 0
+            }
+          }
+        ]
+      }.to_json
+    end
+
+    it 'renders a successful response' do
+      get api_v1_areas_url(api_key: user.api_key)
+      expect(response).to be_successful
+    end
+
+    it 'returns the stats' do
+      get api_v1_stats_url(api_key: user.api_key)
+
+      expect(response).to be_successful
+      expect(response.body).to eq(expected_json)
+    end
   end
 end