Bring splitter/base from spree

app/models/spree/stock/splitter/base.rb

@@ -0,0 +1,29 @@
+module Spree
+  module Stock
+    module Splitter
+      class Base
+        attr_reader :packer, :next_splitter
+
+        def initialize(packer, next_splitter=nil)
+          @packer = packer
+          @next_splitter = next_splitter
+        end
+        delegate :stock_location, :order, to: :packer
+
+        def split(packages)
+          return_next(packages)
+        end
+
+        private
+
+        def return_next(packages)
+          next_splitter ? next_splitter.split(packages) : packages
+        end
+
+        def build_package(contents=[])
+          @packer.package_factory.new(stock_location, order, contents)
+        end
+      end
+    end
+  end
+end

spec/models/spree/stock/splitter/base_spec.rb

@@ -0,0 +1,37 @@
+require 'spec_helper'
+
+module Spree
+  module Stock
+    module Splitter
+      describe Base do
+        let(:packer) { build(:stock_packer) }
+
+        it 'continues to splitter chain' do
+          splitter1 = Base.new(packer)
+          splitter2 = Base.new(packer, splitter1)
+          packages = []
+
+          splitter1.should_receive(:split).with(packages)
+          splitter2.split(packages)
+        end
+
+        it 'builds package using package factory' do
+          # Basic extension of Base splitter used to test build_package method
+          class ::BasicSplitter < Base
+            def split(packages)
+              build_package
+            end
+          end
+
+          # Custom package used to test setting package factory
+          class ::CustomPackage
+            def initialize(stock_location, order, splitters); end
+          end
+          allow(Spree::Config).to receive(:package_factory) { CustomPackage }
+
+          expect(::BasicSplitter.new(packer).split(nil).class).to eq CustomPackage
+        end
+      end
+    end
+  end
+end