* 2-0-stable: (121 commits)
Stub default value for other calls to File.exist?
Add specs for error cases in shipments_controller_spec
Move features/admin/reports/enterprise_fee_summaries_spec to xdescribe (will be fixed as part of spree upgrade phase 2)
Add missing translation to fix shipping methods spec
Test tagging polymorphism on a payment method
Workaround Rails inheritance bug in Spree::Gateway
Improve method names in shipments_controller_spec
Move ProductImporter spec to xdescribe until all its specs are green (spree upgrade phase 2)
Make bulk invoices part of spree upgrade phase 2
Make Api::ShipmentsController#create re-use order.shipment if it exists Improve code and add specs to this controller
Decorate spree api shipments controller to scope variants as they are added/removed from shipments
Delete all Spree::Admin::LineItemsController customizations as they are no longer used
Update spec/controllers/spree/orders_controller_spec.rb
Fix broken spec from refactored method
Wait for button to disappear before checking flash
Use flash matcher in shipping method feature specs
Add RSpec matchers for flash messages
Do not expect modal open when checking spinner gone
Fix layout violation in Spree::Ability decorator
Fix description for feature flag example groups
...
Due to a bug in ActiveRecord we need to load the tagging code in Gateway which
should have inherited it from its parent PaymentMethod.
We have to call it before loading the PaymentMethod decorator because the
tagging code won't load twice within the inheritance chain.
https://github.com/openfoodfoundation/openfoodnetwork/issues/3121
This ensures we can still use Order#shipment although Spree deprecates
it, while fixing a bug at the same time. The problem that was making the
test fail was on `Order#shipment` that Spree defines.
If the shipments association changes, `#shipment` returns stale data.
That is because the order object we might be using is still alive, and
so its @shipment ivar still holds an old shipment object (it's not nil)
and thus `@shipment ||= shipments.last` doesn't evaluate the right-hand
side of the expression.
Note that we need to `prepend` the evaluation of the concern (which it's
been rename) for our methods to take precedence over Spree ones. With
`include`, Spree's `#shipment` would still be picked up making the test
fail.
This makes the default value of variant.on_demand false in all environments and in tests.
Additionally, adapt VariantStock.on_demand test and product factory to this change (setting on_hand value in product factory so it's not out of stock by default).
