Rails 3.2.9.用RSpec测试观察者(应该接收的问题)

Question

我有这样的问题。我的测试检查Observer是否调用，但不执行它。我的文件:

todo_observer.rb:

class TodoObserver < ActiveRecord::Observer     
  def after_create(todo)
   todo.add_log('creating')
  end    
 end

todo.rb:

class Todo < ActiveRecord::Base
  attr_accessible :content, :done, :order
  validates :content, :presence => true,
            :length => {:minimum => 2}
  def add_log(event)
    Logdata.start_logging(self.content, event)
  end
end

logdata.rb

class Logdata < ActiveRecord::Base
  attr_accessible :modification, :event
  def self.start_logging(content, event)
    Logdata.create!(:modification => content, :event => event)
  end
end

todo_observer_spec.rb:

require 'spec_helper'
describe TodoObserver do
  before(:each) do
    @attr = { :modification => "Example", :event => 'Event' }
    @attr_todo = { :content => "Example", :done => :false }
  end
  describe 'after_create' do
    it "should create log about creating task" do
      count_log = Logdata.all.size
      todo = Todo.new(@attr_todo)
      todo.should_receive(:add_log).with('creating')
      todo.save!
      (Logdata.all.size).should eq(count_log + 1)
    end
  end
end

当我运行测试时，我得到这样的错误

失败/错误:(Logdata.all.size)。应该eq(count_log + 1)

   expected: 1
        got: 0

它的平均值，观察者调用，但不创建Logdata的实例。当我注释字符串(检查调用)

todo.should_receive (add_log);(创造)

我的测试成功了。相应地，当我注释字符串(Logdata.all.size).should eq(count_log + 1)并取消注释前一个字符串时，它的成功。函数应该如何接收来创建类Logdata的实例?

Answer 1

should_receive阻止实际的方法被调用。

您应该创建两个独立的测试。一个检查日志是否已添加到todo，另一个检查日志是否已创建。

describe 'after_create' do
  it "should add a log to the todo" do
    todo = Todo.new(@attr_todo)
    todo.should_receive(:add_log).with('creating')
    todo.save!
  end
  it "should create a new logdata" do
    todo = Todo.new(@attr_todo)
    expect {
      todo.save!
    }.to change {Logdata.count}.by(1)
  end
end