Panda & Tiger: Done. Eagle: confused.

.rspec

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+--color

models/automobile.rb

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+require_relative 'Vehicle'
+
+class Automobile < Vehicle
+
+	attr_reader :color, :make, :model, :year
+
+	def initialize(color, make, model, year)
+		@color = color
+		@make = make
+		@model = model
+		@year = year
+	end
+
+	def update(args)
+		@color = args.fetch(:color) if args[:color]
+		@make = args.fetch(:make) if args[:make]
+		@model = args.fetch(:model) if args[:model]
+		@year = args.fetch(:year) if args[:year]
+	end
+end

models/motorcycle.rb

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+require_relative 'vehicle'
+
+class Motorcycle < Vehicle
+
+	def self.number_of_wheels
+		2
+	end
+
+end

models/vehicle.rb

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+class Vehicle
+
+	@@vehicles_made ||= 0
+
+	def initialize
+		@@vehicles_made += 1
+	end
+
+	def self.number_of_wheels
+		4
+	end
+
+end

spec/automobile_spec.rb

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+require 'spec_helper'
+
+describe Automobile do
+
+	let(:auto) { Automobile.new("Yellow", "Honda", "Accord", "1988")}
+
+	it "returns the number of wheels for its class" do
+		Automobile.number_of_wheels.should eq(4)
+	end
+
+	it "has a color" do
+		auto.color.should eq("Yellow")
+	end
+
+	it "has a make" do
+		auto.make.should eq("Honda")
+	end
+
+	it "has a model" do
+		auto.model.should eq("Accord")
+	end
+
+	it "has a year" do
+		auto.year.should eq("1988")
+	end
+
+	it "can have one of its attributes updated by hash" do
+		auto.update(color: "Blue")
+		auto.color.should eq("Blue")
+	end
+
+	it "can have many of its attributes updated by hash" do
+		auto.update(color: "Red", year: "1993")
+		auto.color.should eq("Red")
+		auto.year.should eq("1993")
+	end
+
+	it "can have all of its attributes updated by hash" do
+		auto.update(color: "Green", model: "Camry", make: "Toyota", year: "2003")
+		auto.color.should eq("Green")
+		auto.make.should eq("Toyota")
+		auto.model.should eq("Camry")
+		auto.year.should eq("2003")
+	end
+end

spec/motorcycle_spec.rb

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+require 'spec_helper'
+
+describe Motorcycle do
+
+	it "does not have 4 tires" do
+		Motorcycle.number_of_wheels.should_not eq(4)
+	end
+
+	it "has 2 tires" do
+		Vehicle.number_of_wheels.should eq(4)
+		Motorcycle.number_of_wheels.should eq(2)
+	end
+end

spec/spec_helper.rb

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+require 'rspec'
+require_relative '../models/automobile'
+require_relative '../models/vehicle'
+require_relative '../models/motorcycle'

spec/vehicle_spec.rb

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+require 'spec_helper'
+
+describe Vehicle do
+
+	it "tracks the number of vehicles created" do
+		Motorcycle.new.should change{@@vehicles_made}.by(1)
+	end
+end