Intro to TDD

refactored_string_util.rb

class StringUtil
  def reverse a_string
    a_string.reverse
  end
end

string_util.rb

class StringUtil
  def reverse a_string
    reversed_string = []
    a_string.split("").each_with_index do |char, index|
     reversed_string[a_string.length - index] = char
    end
    reversed_string.join
  end
end

string_util_spec.rb

describe StringUtil do
  it 'should reverse a string' do
    string_util = StringUtil.new
    reversed_string = string_util.reverse('This is a test')
    expect(reversed_string).to eq 'tset a si sihT'
  end
end