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The Example in A Field Guide to Unit Testing series in https://jennycodes.me
# frozen_string_literal: true
require 'rspec'
require_relative 'restaurant'
RSpec.describe Restaurant::Server do
describe '#take_order' do
it 'with French toast passes the order to Cook' do
expect_any_instance_of(Restaurant::Cook).to receive(:make_french_toast)
Restaurant::Server.new.take_order('French toast')
end
it 'with other orders returns an error message' do
result = Restaurant::Server.new.take_order('Not French toast')
expect(result).to be_kind_of String
end
it 'with other orders does not pass order to Cook' do
expect_any_instance_of(Restaurant::Server).not_to receive(:serve)
Restaurant::Server.new.take_order('Not French toast')
end
end
describe '#serve' do
it 'returns decorated dish as a string' do
result = Restaurant::Server.new.serve('French toast is here. Ugh.')
expect(result).to eq 'Delicious French toast yo!'
end
end
end
RSpec.describe Restaurant::Cook do
describe '#make_french_toast' do
context 'with ingredients prepared' do
it 'returns French toast as string' do
allow(Restaurant::StorageRoom).to receive(:get).with('egg').and_return('egg')
allow(Restaurant::StorageRoom).to receive(:get).with('bread').and_return('bread')
result = Restaurant::Cook.new.make_french_toast
expect(result).to eq 'French toast is here. Ugh.'
end
end
context 'without everything prepared' do
it 'returns error message - egg' do
allow(Restaurant::StorageRoom).to receive(:get).with('egg').and_return(nil)
allow(Restaurant::StorageRoom).to receive(:get).with('bread').and_return('bread')
result = Restaurant::Cook.new.make_french_toast
expect(result).to eq 'Oops running out of eggs!'
end
it 'returns error message - bread' do
allow(Restaurant::StorageRoom).to receive(:get).with('egg').and_return('egg')
allow(Restaurant::StorageRoom).to receive(:get).with('bread').and_return(nil)
result = Restaurant::Cook.new.make_french_toast
expect(result).to eq 'Oops running out of bread!'
end
end
end
end
module Restaurant
class Server
def take_order(dish)
if dish == 'French toast'
Cook.new.make_french_toast
else
"We only make French toast. Take it or leave it."
end
end
# This method is called when Cook is done cooking the dish.
def serve(dish)
decorated_dish = decorate(dish)
"#{decorated_dish} yo!"
end
private
def decorate(dish_with_murmur)
dish_name = dish_with_murmur.gsub(' is here. Ugh.', '')
"Delicious #{dish_name}"
end
end
class Cook
def make_french_toast
# [Step 1] Get eggs and bread from StorageRoom
egg = StorageRoom.get('egg')
bread = StorageRoom.get('bread')
# Some error cases handling
return 'Oops running out of eggs!' unless egg
return 'Oops running out of bread!' unless bread
# [Step 2] Making French toast with the eggs and bread
puts 'Making French toast'
# [Step 3] Return the plate of French toast as a string
'French toast is here. Ugh.'
end
end
class StorageRoom
def self.get(ingredient)
# We don't really care about the implementation.
# Just know that it's supposed to return the ingredient if the database has it.
end
def self.put(ingredient)
# We don't really care about the implementation.
# Just know that it's supposed to insert the ingredient into the database.
end
end
end
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