```ruby
# frozen_string_literal: true

require 'spec_helper'

module OrderManagement
  module Stock
    describe Packer do
      let(:order) { create(:order_with_line_items, line_items_count: 5) }
      let(:stock_location) { create(:stock_location) }

      subject { Packer.new(stock_location, order) }

      before { order.line_items.first.variant.weight = 1 }

      it 'builds a package with all the items' do
        package = subject.package

        expect(package.contents.size).to eq 5
        expect(package.weight).to be_positive
      end

      it 'variants are added as backordered without enough on_hand' do
        expect(stock_location).to receive(:fill_status).exactly(5).times.and_return([2, 3])

        package = subject.package
        expect(package.on_hand.size).to eq 5
        expect(package.backordered.size).to eq 5
      end
    end
  end
end
```

Update test setup in Packer spec.
user
```ruby
# frozen_string_literal: true

require 'spec_helper'

module OrderManagement
  module Stock
    describe Packer do
      let(:order) { create(:order_with_line_items, line_items_count: 5) }
      let(:stock_location) { create(:stock_location) }

      subject { Packer.new(stock_location, order) }

      before { order.line_items.first.variant.update(unit_value: 100) }

      it 'builds a package with all the items' do
        package = subject.package

        expect(package.contents.size).to eq 5
        expect(package.weight).to be_positive
      end

      it 'variants are added as backordered without enough on_hand' do
        expect(stock_location).to receive(:fill_status).exactly(5).times.and_return([2, 3])

        package = subject.package
        expect(package.on_hand.size).to eq 5
        expect(package.backordered.size).to eq 5
      end
    end
  end
end
```
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