Move budget result test to the model

We were testing that the `calculate_winners` method does not take the
price into account; we can do the same in a model test. We already have
a different system test to check that the price isn't displayed in the
view.

spec/models/budget/result_spec.rb

@@ -83,5 +83,20 @@ describe Budget::Result do
         expect(heading.investments.winners.pluck(:ballot_lines_count)).to match_array([900, 800, 700])
       end
     end
+
+    context "budget with the hide money option" do
+      before { budget.update!(voting_style: "approval", hide_money: true) }
+
+      it "does not take the price into account" do
+        create(:budget_investment, :selected, heading: heading, price: 100, ballot_lines_count: 500)
+        create(:budget_investment, :incompatible, heading: heading, price: 300, ballot_lines_count: 800)
+        create(:budget_investment, :selected, heading: heading, price: 800, ballot_lines_count: 700)
+        create(:budget_investment, :selected, heading: heading, price: 500, ballot_lines_count: 600)
+
+        Budget::Result.new(budget, heading).calculate_winners
+
+        expect(heading.investments.winners.pluck(:ballot_lines_count)).to match_array([700, 600, 500])
+      end
+    end
   end
 end

spec/system/budgets/results_spec.rb

@@ -81,27 +81,6 @@ describe "Results" do
     expect(page).not_to have_content "€"
   end
 
-  scenario "Does not have in account the price on hide money budgets" do
-    budget.update!(voting_style: "approval", hide_money: true)
-    heading.update!(price: 0)
-
-    inv1 = create(:budget_investment, :selected, heading: heading, price: 2000, ballot_lines_count: 1000)
-    inv2 = create(:budget_investment, :selected, heading: heading, price: 5000, ballot_lines_count: 1000)
-
-    Budget::Result.new(budget, heading).calculate_winners
-
-    visit budget_path(budget)
-    click_link "See results"
-
-    expect(page).to have_content inv1.title
-    expect(page).to have_content inv2.title
-    expect(page).not_to have_content inv1.price
-    expect(page).not_to have_content inv2.price
-    expect(page).not_to have_content "Price"
-    expect(page).not_to have_content "Available budget"
-    expect(page).not_to have_content "€"
-  end
-
   scenario "Does not raise error if budget (slug or id) is not found" do
     visit budget_results_path("wrong budget")