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calculator.py

import math

class Calculator:
  def plus(self, first, second):
    return first + second

  def pi(self):
    return math.pi

calculator_spec.rb

require 'spec_helper'

Calculator = Jython::Class.import "Calculator",
                           :from => "util.calculator"

describe Calculator do
  let(:calculator) { Calculator.new }

  it "should allow methods with no arguments to be called" do
    calculator.pi.should be_within(0.00001).of(3.14159)
  end

  it "should allow methods with primitive arguments to be called" do
    calculator.plus(1, 2).should == 3
  end
end