Quick and dirty rspec BigDecimal matcher

big_decimal_matcher.rb

    RSpec::Matchers.define :be_decimal do |expected|
      match do |actual|
        coerce(actual) == coerce(expected)
      end

      failure_message_for_should do |actual|
        "expected that #{format(actual)} would equal #{format(expected)}"
      end

      def coerce(value)
        BigDecimal(value, 2)
      end

      def format(value)
        coerce(value).to_s('F')
      end
    end