Add change log in investment participatory budget

spec/features/admin/change_log_spec.rb

@@ -0,0 +1,71 @@
+require "rails_helper"
+
+feature "Admin change log" do
+  let(:budget) {create(:budget)}
+  let(:administrator) do
+    create(:administrator, user: create(:user, username: "Ana", email: "ana@admins.org"))
+  end
+
+  context "Investments Participatory Budgets" do
+
+    background do
+      @admin = create(:administrator)
+      login_as(@admin.user)
+    end
+
+    scenario "No changes" do
+      budget_investment = create(:budget_investment,
+                                 price: 1234,
+                                 price_first_year: 1000,
+                                 feasibility: "unfeasible",
+                                 unfeasibility_explanation: "It is impossible",
+                                 administrator: administrator)
+
+      visit admin_budget_budget_investments_path(budget_investment.budget)
+
+      click_link budget_investment.title
+
+      expect(page).to have_content(budget_investment.title)
+      expect(page).to have_content(budget_investment.description)
+      expect(page).to have_content(budget_investment.author.name)
+      expect(page).to have_content(budget_investment.heading.name)
+      expect(page).to have_content("There are not changes logged")
+    end
+
+    scenario "Changes" do
+      budget_investment = create(:budget_investment,
+                                 price: 1234,
+                                 price_first_year: 1000,
+                                 feasibility: "unfeasible",
+                                 unfeasibility_explanation: "It is impossible",
+                                 administrator: administrator)
+
+      visit admin_budget_budget_investments_path(budget_investment.budget)
+
+      click_link budget_investment.title
+
+      expect(page).to have_content(budget_investment.title)
+      expect(page).to have_content(budget_investment.description)
+      expect(page).to have_content(budget_investment.author.name)
+      expect(page).to have_content(budget_investment.heading.name)
+      expect(page).to have_content("There are not changes logged")
+
+      budget_investment.update(title: "test")
+
+      visit admin_budget_budget_investments_path(budget_investment.budget)
+
+      click_link budget_investment.title
+
+      expect(page).not_to have_content("There are not changes logged")
+      expect(page).to have_content("Change Log")
+      expect(page).to have_content("Title")
+      expect(page).to have_content("test")
+      expect(page).to have_content("Field")
+      expect(page).to have_content("Old Value")
+      expect(page).to have_content("New Value")
+      expect(page).to have_content("Edited at")
+      expect(page).to have_content("Edited by")
+    end
+
+  end
+end