stubbing-activerecord-association-proxy-using-mocha-orders.rb

# db/migrate/20091123163221_create_orders.rb
class CreateOrders < ActiveRecord::Migration
  def self.up
    create_table :orders do |t|
      t.string :name
 
      t.timestamps
    end
  end
 
  def self.down
    drop_table :orders
  end
end
 
# db/migrate/20091123163241_create_items.rb
class CreateItems < ActiveRecord::Migration
  def self.up
    create_table :items do |t|
      t.string :name
      t.decimal :cost
      t.belongs_to :order
 
      t.timestamps
    end
  end
 
  def self.down
    drop_table :items
  end
end
 
# app/models/order.rb
class Order < ActiveRecord::Base
  has_many :items
end
 
# app/models/item.rb
class Item < ActiveRecord::Base
  belongs_to :order
end
 
# config/environment.rb
  config.gem "mocha" # gem 0.9.8
 
# test/unit/item_test.rb
require 'test_helper'
require "mocha"
 
class ItemTest < ActiveSupport::TestCase
  
  # test "association proxy works with mocha" do
  # widget = Widget.new
  # widget.thingummies.stubs(:sum).returns(99)
  # assert_equal 99, widget.thingummies.sum
  # end
  
  test "association proxy works with mocha" do
    widget = Order.new
    widget.items.stubs(:sum).returns(99.0)
    assert_equal 99.0, widget.items.sum(:cost).to_f
  end
 
end
 
#
# $ rake test:units
# (in /home/james/ra/test_mocha)
# /usr/bin/ruby1.8 -I"lib:test" "/usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader.rb" "test/unit/order_test.rb" "test/unit/item_test.rb" "test/unit/helpers/items_helper_test.rb" "test/unit/helpers/orders_helper_test.rb"
# Loaded suite /usr/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake/rake_test_loader
# Started
# F.
# Finished in 0.072515 seconds.
#
# 1) Failure:
# test_association_proxy_works_with_mocha(ItemTest) [/test/unit/item_test.rb:15]:
# <99.0> expected but was
# <0.0>.
#
# 2 tests, 2 assertions, 1 failures, 0 errors