Add missing test to search by SDG

We had only added a test to seach by target.

spec/system/advanced_search_spec.rb

@@ -367,9 +367,31 @@ describe "Advanced search", :js do
       end
     end
 
-    scenario "Search by SDG target" do
+    describe "SDG" do
+      before do
         Setting["feature.sdg"] = true
         Setting["sdg.process.debates"] = true
+        Setting["sdg.process.budgets"] = true
+      end
+
+      scenario "Search by goal" do
+        create(:budget_investment, title: "Purifier", heading: heading, sdg_goals: [SDG::Goal[6]])
+        create(:budget_investment, title: "Hospital", heading: heading, sdg_goals: [SDG::Goal[3]])
+
+        visit budget_investments_path(budget)
+        click_link "Advanced search"
+        select "6. Clean Water and Sanitation", from: "By SDG"
+        click_button "Filter"
+
+        expect(page).to have_content("There is 1 investment")
+
+        within("#budget-investments") do
+          expect(page).to have_content "Purifier"
+          expect(page).not_to have_content "Hospital"
+        end
+      end
+
+      scenario "Search by target" do
         create(:debate, title: "Unrelated")
         create(:debate, title: "High school", sdg_targets: [SDG::Target["4.1"]])
         create(:debate, title: "Preschool", sdg_targets: [SDG::Target["4.2"]])
@@ -389,3 +411,4 @@ describe "Advanced search", :js do
       end
     end
   end
+end