For some reason the order is in address state here instead of cart state when adding customer details. There's a conditional in the view which loads the customer selection dropdown that was not being triggered, so a customer could not be selected (and their existing address was not being filled out in the form).
Fixes:
1)
As an administrator
I want to manage orders
filling customer details
Failure/Error: expect(order.ship_address.lastname).to eq @customer.ship_address.lastname
NoMethodError:
undefined method `lastname' for nil:NilClass
# ./spec/features/admin/orders_spec.rb:179:in `block (2 levels) in <top (required)>'