Rspec testing POROs included in models rails - ruby-on-rails

Question

In my Order model I include a PORO class "ShipmentHandler". This PORO is located like this: app/models/order/shipment_handler.rb
I invoke this in my Order model like so:
def assign_shipments
ShipmentHandler.new(self).assign_shipments
end
My PORO looks like:
class Order
class ShipmentHandler
def initialize(order)
#set_some_variables
end
def some_methods
end
end
end
I'm trying to create spec to test the methods in my ShipmentHandler class. I'm not sure how to do this as I keep getting errors like uninitialized constant ShipmentHandler
I've tried to add it to my order_spec.rb like so:
describe Order do
describe Order::ShipmentHandler do
end
end
and:
describe Order do
describe ShipmentHandler do
end
end
Neither work. I've also tried creating a spec in spec/models/order/shipment_handler_spec.rb
This also failed.

Answer 1

The following way of writing specs worked for me when I made some assumptions on what your Order class looks like with the nested ShipmentHandler class:
class Order
def assign_shipments
ShipmentHandler.new(self).assign_shipments
end
class ShipmentHandler
def initialize(order)
#order = order
end
def some_methods
end
end
end
RSpec.describe Order do
it { is_expected.to be_a Order }
end
# Method 1
RSpec.describe Order::ShipmentHandler do
subject(:shipment_handler) { described_class.new(Order.new) }
it { is_expected.to be_a Order::ShipmentHandler }
end
# Method 2
class Order
RSpec.describe ShipmentHandler do
subject(:shipment_handler) { described_class.new(Order.new) }
it { is_expected.to be_a Order::ShipmentHandler }
end
end