starting a shared_example for all index

spec/shared/examples.rb

+RSpec.shared_examples "get a list" do |url, object|
+  get url do
+    parameter :limit, 'Limit of #{object}'
+    parameter :offset, 'Offset of #{object}'
+
+    let(:limit) { 12 }
+    let(:offset) { 0 }
+
+    example_request 'Get a list of #object' do
+      expect(JSON.parse(response_body).map { |o| o['id'] }.sort).to eq(object.limit(limit).offset(offset).pluck(:id).sort)
+      expect(status).to eq(200)
+    end
+  end
+end