Add tests to check visibility of processes depending on published attribute

spec/features/admin/legislation/processes_spec.rb

@@ -88,6 +88,7 @@ feature 'Admin legislation processes' do
 
       expect(page).to have_selector("h2", text: "An example legislation process")
       expect(find("#legislation_process_debate_phase_enabled")).to be_checked
+      expect(find("#legislation_process_published")).to be_checked
 
       fill_in 'legislation_process_summary', with: ''
       click_button "Save changes"