Switch button text when scheme exists already

app/views/schemes/check_answers.html.erb

@@ -116,5 +116,6 @@
 <%= form_for(@scheme, as: :scheme, method: :patch) do |f| %>
   <%= f.hidden_field :page, value: "check-answers" %>
   <%= f.hidden_field :confirmed, value: "true" %>
-  <%= f.govuk_submit "Create scheme" %>
+  <% button_label = @scheme.confirmed? ? "Save" : "Create scheme" %>
+  <%= f.govuk_submit button_label %>
 <% end %>

spec/features/schemes_spec.rb

@@ -270,6 +270,11 @@ RSpec.describe "Schemes scheme Features" do
                   expect(page.current_url.split("/").last).to eq("check-answers#locations")
                   expect(page).to have_content(location_name)
                 end
+
+                it "has the correct action button text" do
+                  expect(page).to have_button("Save")
+                  expect(page).not_to have_button("Create scheme")
+                end
               end
             end
           end