add zone test-rspec

spec/requests/api/restaurant/zones.rb

@@ -0,0 +1,25 @@
+require 'rails_helper'
+
+RSpec.describe 'Zone API', type: :request do
+  # initialize test data
+  let!(:zone) { create_list(:zone, 10) }
+  let(:zone_id) { zones.first.id }
+
+  # Test suite for GET /todos
+  describe 'GET /api/restaurant/zones' do
+    # make HTTP get request before each example
+    before { get '/api/restaurant/zones' }
+
+    it 'returns zones' do
+      # Note `json` is a custom helper to parse JSON responses
+      expect(json).not_to be_empty
+      expect(json.size).to eq(10)
+    end
+
+    it 'returns status code 200' do
+      expect(response).to have_http_status(200)
+    end
+  end
+
+
+end