bridge_row.rb

# Importer::BridgeRow
#
# Associates a row with a transaction
# Determine new or existing employee, pass off to new/existing instance
# Sets messages and state on transaction after processing

require 'importer/transaction_factory'

module Importer
  class BridgeRow
    attr_accessor :transaction

    def initialize(bridge, row)
      raise NoBridgeError unless bridge
      raise NoRowError unless row

      @bridge, @row = bridge, row
      @transaction = TransactionFactory.new
    end

    def process
    end
  end
end

class NoBridgeError < Exception; end
class NoRowError < Exception; end

bridge_row_spec.rb

require 'importer/bridge_row'

describe Importer::BridgeRow do

  before :each do
    @bridge = double
    @row = ['0', 'Jim', 'Rice']
  end

  it 'should raise an exception if no bridge is given' do
    expect { Importer::BridgeRow.new(nil, @row) }.to raise_exception NoBridgeError
  end

  it 'should raise an exception if no row is given' do
    expect { Importer::BridgeRow.new(@bridge, nil) }.to raise_exception NoRowError
  end

  context 'initialized with proper arity' do
    before :each do
      @bridge_row = Importer::BridgeRow.new(@bridge, @row)
    end

    it 'should create an associated transaction' do
      expect(@bridge_row.transaction).to be_a(TransactionFactory)
    end
  end
end

class ImportTransaction; end

transaction_factory.rb

class TransactionFactory
  def initialize
    ImportTransaction.new
  end
end