Supplier with specced time zone and night offset support

spec/acceptance_steps/supplier_steps.rb

@@ -8,3 +8,14 @@ step "There is an open supplier with a menu" do
   @apple_pie.add_product_category @category_lunch
 end
 
+step "the supplier is in :time_zone" do |time_zone|
+  time_zone = ActiveSupport::TimeZone.zones_map[time_zone]
+  raise "time zone #{time_zone} cannot be found" unless time_zone
+  @supplier.time_zone = time_zone.name
+  @supplier.save
+end
+
+step "the supplier has a night offset of :minutes minutes" do |minutes|
+  @supplier.night_offset = minutes
+  @supplier.save
+end