Debugging with rspec

1_hello_world.rb

### SETUP
require 'rspec'

### LOGIC (fix me)
class HelloWorld

  def hello
    @hello
  end 

  def initialize(who)
   @hello = who
   puts "hello #{who}!"
  end

end 

# greeting = HelloWorld.new('world')
# greeting.hello

# TEST CODE (don't touch me)

describe '#hello' do
  it 'returns "hello world!" when "world" is passed in' do
    result = hello('world')
    expect(result).to eq('hello world!')
  end
end