Ensure we choose a plant part

spec/features/harvests/harvesting_a_crop_spec.rb

@@ -63,6 +63,7 @@ feature "Harvesting a crop", :js do
     visit crop_path(maize)
     click_link "Harvest this"
     within "form#new_harvest" do
+      select "whole plant", from: '#harvest_plant_part_id'
       expect(page).to have_selector "input[value='maize']"
       click_button "Save"
     end