“new” Keyword in the Constructor or at Field Declaration

new_in_constructor-good.rb

class House
  attr_reader :bedroom
  
  def initialize(bedroom)
    @bedroom = bedroom
  end
  
  def enough_space?(people_count)
    bedroom.beds_count >= people_count
  end
end

describe House do
  it "tests something important in House" do
    # Awesome, I can use test doubles that
    # are lighter weight.
    # ...
    dummy_bedroom = instance_double('Bedroom', beds_count: 2)
    house = House.new(dummy_bedroom)
    expect(house.enough_space?(1)).to be true
  end
end