Inheritance.rb

class MotorVehicle
  
  def initialize(args={})
    @color = args[:color]
    @wheels = args[:wheels]
  end
 
  def brake
    @status = :stopped 
  end
 
  def drive
    return self.brake if stop_requested
    @speed
    @status = :driving
  end
 
  def needs_gas?
    @gas
  end
 
end
 
class Car < MotorVehicle
 
  attr_reader :stop_requested
 
  def initialize(args={})
    @color = args[:color]
    @wheels = 4
    @stop_requested = false
    @gas = [true,true,false].sample
  end
 
end
 
class Bus < MotorVehicle
 
  attr_reader :passengers, :stop_requested
  
  def initialize(args={})
    @color = args[:color]
    @wheels = args[:wheels]
    @num_seats = args[:num_seats]
    @fare = args[:fare]
    @stop_requested = [true,false].sample
    @passengers=[]
    @gas = [true,true,true,false].sample
  end
    
  def admit_passenger(passenger,money)
    @passengers << passenger if money > @fare
  end
    
end
 
class Motorbike < MotorVehicle
  attr_reader  :stop_requested
 
  def initialize(args={})
    @color = args[:color]
    @wheels = 2
    @status = :stopped
    @stop_requested = false
    @gas = [true,false,false,false].sample
  end
 
  def drive
    @status = :driving
    @speed = :fast
  end
   
  def weave_through_traffic
    @status = :driving_like_a_crazy_person
  end
 
end

Inheritance_spec.rb

require "rspec"
require_relative "Inheritance"

	describe Car do
		
		describe "#need_gas?" do
		  it "returns true 66% of the time if the car needs gas" do
		    need_gas_one = [true,true,true].sample
		    expect(need_gas_one).to eql(true)
		  end
		end
	
		describe "#drive" do 
		  it "increases speed and changes the status to driving if stop is not requested" do
		    murano = Car.new(color: "black", wheels: 4, stop_requested: false, gas: true)
		    expect(murano.drive).to eql(:driving)
		  end
		end

		describe "#brake" do
		  it "changes the status of the car to stopped" do
		    nissan = Car.new(color: "blue", wheels: 4, stop_requested: true, gas: true)
		    expect(nissan.brake).to eql(:stopped)
	          end
		end
	end


	describe Bus do

		describe "#admit_passenger" do 
		  it "adds a passenger to the vehicle if the passenger has correct fare amount" do
		    big_yellow = Bus.new(color: "Yellow", wheels: 8, num_seats: 24, fare: "$2.50")
		    big_yellow.admit_passenger("John Doe", "$3.00")
		    expect(big_yellow.passengers).to eql(["John Doe"])
		  end
		end
	end

	describe Motorbike do

		describe "#weave_through_traffic" do
		  it "changes the status of the motorbike to driving like a crazy person" do
		    harley = Motorbike.new(color: "silver")
		    expect(harley.weave_through_traffic).to eql(:driving_like_a_crazy_person)
		  end
		end
	end