Modified feature spec to pass with the new UI

Add feature spec to test if the 'Calculate winners'
button is enabled or not, depending on the phase.
It also checks the message that clarifies why the
button is disabled.

spec/features/admin/budget_investments_spec.rb

@@ -366,6 +366,23 @@ feature 'Admin budget investments' do
       expect(page).not_to have_select("tag_name", options: ["All tags", "Accessibility"])
     end
 
+    scenario "Disable 'Calculate winner' button if incorrect phase" do
+      budget.update(phase: 'reviewing_ballots')
+
+      visit admin_budget_budget_investments_path(budget)
+      click_link 'Winners'
+
+      expect(page).to have_link "Calculate Winner Investments"
+
+      budget.update(phase: 'accepting')
+
+      visit admin_budget_budget_investments_path(budget)
+      click_link 'Winners'
+
+      expect(page).not_to have_link "Calculate Winner Investments"
+      expect(page).to have_content 'The budget has to stay on phase "Balloting projects", "Reviewing Ballots" or "Finished budget" in order to calculate winners projects'
+    end
+
     scenario "Limiting by max number of investments per heading", :js do
       group_1 = create(:budget_group, budget: budget)
       group_2 = create(:budget_group, budget: budget)

spec/features/admin/budgets_spec.rb

@@ -186,7 +186,8 @@ feature 'Admin budgets' do
   end
 
   context "Calculate Budget's Winner Investments" do
-    scenario 'For a Budget in reviewing balloting' do
+
+    scenario 'For a Budget in reviewing balloting', :js do
       budget = create(:budget, phase: 'reviewing_ballots')
       group = create(:budget_group, budget: budget)
       heading = create(:budget_heading, group: group, price: 4)