creates routes and builds systems basic controller and view

app/assets/javascripts/systems.js

+// Place all the behaviors and hooks related to the matching controller here.
+// All this logic will automatically be available in application.js.

app/assets/stylesheets/systems.css

+/*
+  Place all the styles related to the matching controller here.
+  They will automatically be included in application.css.
+*/

app/controllers/systems_controller.rb

+class SystemsController < ApplicationController
+  def index
+    @systems = System.all
+  end
+end

app/helpers/systems_helper.rb

+module SystemsHelper
+end

app/views/systems/index.html.erb

+<h1>Systems</h1>
+
+<table>
+  <tr>
+    <th>Hostname</th>
+    <th>OS</th>
+  </tr>
+
+<% @systems.each do |system| %>
+  <tr>
+    <td><%= system.hostname %></td>
+    <td><%= system.os %></td>
+  </tr>
+<% end %>
+</table>

config/routes.rb

 Rails.application.routes.draw do
+  get 'systems/index'
+
   # The priority is based upon order of creation: first created -> highest priority.
   # See how all your routes lay out with "rake routes".
 
@@ -53,4 +55,9 @@ Rails.application.routes.draw do
   #     # (app/controllers/admin/products_controller.rb)
   #     resources :products
   #   end
+
+  resources :systems
+  resources :packages
+  resources :vulnerabilities
+  root 'systems#index'
 end

spec/controllers/systems_controller_spec.rb

+require 'rails_helper'
+
+RSpec.describe SystemsController, type: :controller do
+
+  describe "GET #index" do
+    it "returns http success" do
+      get :index
+      expect(response).to have_http_status(:success)
+    end
+  end
+
+end

spec/helpers/systems_helper_spec.rb

+require 'rails_helper'
+
+# Specs in this file have access to a helper object that includes
+# the SystemsHelper. For example:
+#
+# describe SystemsHelper do
+#   describe "string concat" do
+#     it "concats two strings with spaces" do
+#       expect(helper.concat_strings("this","that")).to eq("this that")
+#     end
+#   end
+# end
+RSpec.describe SystemsHelper, type: :helper do
+  pending "add some examples to (or delete) #{__FILE__}"
+end

spec/views/system/index.html.erb_spec.rb

+require 'rails_helper'
+
+RSpec.describe "system/index.html.erb", type: :view do
+  pending "add some examples to (or delete) #{__FILE__}"
+end

spec/views/systems/index.html.erb_spec.rb

+require 'rails_helper'
+
+RSpec.describe "systems/index.html.erb", type: :view do
+  pending "add some examples to (or delete) #{__FILE__}"
+end