Project Euler Problem 1

ek-euler-1.rb

# project euler problem 1

require 'minitest/autorun'

class Problem1
  def x_multiple_of_y?(x, y)
    x % y == 0 ? true : false
  end

  def sum_multiples_below(capnum)
    i = 1
    sum = 0
    while i < capnum do
      if x_multiple_of_y?(i,3)
        sum += i
      elsif x_multiple_of_y?(i,5)
        sum += i
      end
      i += 1
    end
    return sum
  end
end

# test problem1 solution
class TestProblem1 < Minitest::Test
  def setup
    @problem1 = Problem1.new
  end

  def test_factors
    assert_equal false, @problem1.x_multiple_of_y?(1, 3)
    assert_equal false, @problem1.x_multiple_of_y?(1, 5)

    assert_equal true, @problem1.x_multiple_of_y?(3, 3)
    assert_equal false, @problem1.x_multiple_of_y?(3, 5)

    assert_equal false, @problem1.x_multiple_of_y?(5, 3)
    assert_equal true, @problem1.x_multiple_of_y?(5, 5)

    assert_equal true, @problem1.x_multiple_of_y?(15, 3)
    assert_equal true, @problem1.x_multiple_of_y?(15, 5)

    assert_equal false, @problem1.x_multiple_of_y?(7, 3)
    assert_equal false, @problem1.x_multiple_of_y?(7, 5)
  end

  def test_answers
    assert_equal 23, @problem1.sum_multiples_below(10)
  end

  def test_solveit
    puts @problem1.sum_multiples_below(1000)
  end
end