Feature: zookeeper can feed animals

zoo.rb

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+#Zoo
+
+class Animal
+
+	def initialize
+		@meals = 0
+	end
+
+	def eat(food)
+		if likes?(food)
+			@meals += 1
+			true
+		else
+			false
+		end
+	end
+
+	def likes?(food)
+		acceptable_food.include?(food.to_sym)
+	end
+
+	def acceptable_food
+		[]
+	end
+
+	def full?
+		false
+	end
+
+end
+
+
+class Panda < Animal
+
+	def acceptable_food
+		[:bamboo]
+	end
+
+	def full?
+		@meals > 30
+	end
+
+end
+
+class Lion < Animal
+
+	def acceptable_food
+		[:wildebeests, :zeebras]
+	end
+
+	def full?
+		@meals > 10
+	end
+end
+
+class Zookeeper
+	def feed(args={})
+		food = args.fetch(:food)
+		panda = args.fetch(:to)
+		panda.eat(food)
+	end
+
+end
+

zoo_spec.rb

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+# Zoo spec file
+require "./zoo"
+
+describe Animal do
+	it "should not raise an exception when we try to like" do
+		expect {
+			Animal.new.likes?(:bacon)
+		}.to_not raise_error
+	end
+
+end
+
+describe Panda do
+
+	it "should like bamboo" do
+		Panda.new.likes?(:bamboo).should eq(true)
+	end
+
+	it "should like bamboo as a string" do
+		Panda.new.likes?("bamboo").should eq(true)
+	end
+
+	it "should not like grasshoppers" do
+		Panda.new.likes?(:grasshoppers).should eq(false)
+	end
+
+	it "should be able to eat the food" do
+		Panda.new.eat(:bamboo).should be_true
+	end
+
+	it "should be full after eating 30 bamboo" do
+		panda = Panda.new
+		31.times do
+			panda.eat(:bamboo)	
+		end
+		panda.should be_full
+	end
+
+	it "should not be full after 1" do
+		panda = Panda.new
+		panda.eat(:bamboo)	
+		panda.should_not be_full
+	end
+end
+
+describe Lion do
+	it "should like wildebeests" do
+		Lion.new.likes?(:wildebeests).should eq(true)
+	end
+
+	it "should like zeebras" do
+		Lion.new.likes?(:zeebras).should eq(true)
+	end
+
+	it "should not like salad" do
+		Lion.new.likes?(:salad).should eq(false)
+	end
+
+	it "should take 11 meals to be full" do
+		lion = Lion.new
+		lion.eat(:zeebras)
+		lion.should_not be_full
+	end
+	it "should take 11 meals to be full" do
+		lion = Lion.new
+		11.times do
+			lion.eat(:zeebras)
+		end
+		lion.should be_full
+	end
+end
+
+describe Zookeeper do
+	it "should be able to feed bamboo to the pandas" do
+		panda = Panda.new
+		panda.should_receive(:eat).with(:bamboo)
+		Zookeeper.new.feed(food: :bamboo, to: panda)
+	end
+
+	it "should be able to feed zeebras to the lions" do
+		lion = Lion.new
+		lion.should_receive(:eat).with(:zeebras)
+		Zookeeper.new.feed(food: :zeebras, to: lion)
+	end
+end