fault spec migration test

gistfile1.rb

# file extract_addresses_from_companies

load 'spec/spec_helper.rb'
load 'db/migrate/20121109212148_extract_addresses_from_companies.rb'

describe ExtractAddressesFromCompanies do
  before do
    @previous_migration_version = '20121108165838'
    @my_migration_version = '20121109212148'
  end


  describe ".up" do
    before do
      ActiveRecord::Migrator.migrate @previous_migration_version
    end

    it "adds address_id column to the companies table" do
      expect {
        ExtractAddressesFromCompanies.up
        Company.reset_column_information
      }.to change{Company.columns.map(&:name)}

      Company.columns.map(&:name).should include("address_id")
    end

  end



  describe ".down" do
    before do
      ActiveRecord::Migrator.migrate @my_migration_version
    end

      it "removes 'address_id' column from companies table" do
        expect {
          ExtractAddressesFromCompanies.down
          Company.reset_column_information
        }.to change {Company.columns.map(&:name)}

        Company.columns.map(&:name).should_not include("address_id")
      end
  end

end

# 20121109212148_extract_addresses_from_companies.rb
class ExtractAddressesFromCompanies < ActiveRecord::Migration
  def up
    add_column :companies, :address_id, :integer
  end

  def down
    remove_column :companies, :address_id
  end
end