fizz_buzz

fizz_buzz.rb

def fizz_buzz(n)
  result = ""
  (1..n).to_a.each do |i|
    x = ""
    x += "Fizz" if i % 3 == 0
    x += "Buzz" if i % 5 == 0
    x = i.to_s if x == ""
    result += x
  end
  result
end

test_fizz_buzz.rb

require 'minitest/autorun'
require './fizz_buzz'

class TestFizzBuzz < MiniTest::Test
  def test_display_numbers_to_n
    assert_equal "1", fizz_buzz(1)
    assert("1" == fizz_buzz(1))
    assert_equal "12", fizz_buzz(2)
  end

  def test_fizz
    assert_equal "12Fizz", fizz_buzz(3)
    assert_equal "12Fizz4", fizz_buzz(4)
  end

  def test_buzz
    assert_equal "12Fizz4Buzz", fizz_buzz(5)
  end

  def test_fizz_buzz
    assert_equal "12Fizz4BuzzFizz78FizzBuzz11Fizz1314FizzBuzz", fizz_buzz(15)
  end
end