tdd_sum_of_multples

som.rb

class SumOfMultiple

  def initialize(lowest = 1, highest = 10)
    @lowest = lowest
    @highest = highest
  end

  def calc(*multiples)
    sum = 0
    (@lowest..@highest).each do |num|
      multiples.each do |multiple|
        sum = sum + num if num % multiple == 0
      end
    end
    sum
  end
end

test.rb

require 'minitest/autorun'
require 'minitest/pride'
require './som.rb'

class TestSumOfMultiple < MiniTest::Test

  def test_multiples_of_three
    som = SumOfMultiple.new(1,10)
    result = som.calc(3)
    assert_equal(18, result)
  end

  def test_multiples_of_five
    som = SumOfMultiple.new
    result = som.calc(5)
    assert_equal(15, result)
  end

  def test_multiples_of_three_and_five
    som = SumOfMultiple.new
    result = som.calc(3,5)
    assert_equal(33, result)
  end

end