如何使用rspec测试我的邮件程序中是否设置了实例变量？

Question

如何使用rspec测试我的邮件程序中是否设置了某个实例变量？分配回来未定义..

require File.dirname(__FILE__) + '/../../spec_helper'

describe UserMailer do

  it "should send the member user password to a User" do
    user = FG.create :user

    user.create_reset_code

    mail = UserMailer.reset_notification(user).deliver

    ActionMailer::Base.deliveries.size.should == 1  

    user.login.should be_present  

    assigns[:person].should == user
    assigns(:person).should == user #both assigns types fail
  end
end

返回的错误是:

undefined local variable or method `assigns' for #<RSpec::Core::ExampleGroup::Nested_1:0x007fe2b88e2928>

Answer 1

assigns仅针对控制器规范定义,并且通过rspec-rails gem完成.在RSpec中没有测试实例变量的通用机制,但您可以使用内核instance_variable_get来访问您想要的任何实例变量.

因此,在您的情况下,如果object您想要检查其实例变量的对象,您可以编写:

expect(object.instance_variable_get(:@person)).to eql(user)

至于获得UserMailer实例的支持,我看不出有任何办法可以做到这一点.查看https://github.com/rails/rails/blob/master/actionmailer/lib/action_mailer/base.rb中的method_missing定义,每当调用未定义的类方法时,将创建一个新的邮件程序实例,其名称与实例方法.但是那个实例没有保存在我能看到的任何地方,只返回了值.这是目前在github上定义的相关代码:.message

课程方法:

  def respond_to?(method, include_private = false) #:nodoc:
    super || action_methods.include?(method.to_s)
  end

  def method_missing(method_name, *args) # :nodoc:
    if respond_to?(method_name)
      new(method_name, *args).message
    else
      super
    end
  end

实例方法:

attr_internal :message

# Instantiate a new mailer object. If +method_name+ is not +nil+, the mailer
# will be initialized according to the named method. If not, the mailer will
# remain uninitialized (useful when you only need to invoke the "receive"
# method, for instance).
def initialize(method_name=nil, *args)
  super()
  @_mail_was_called = false
  @_message = Mail.new
  process(method_name, *args) if method_name
end

def process(method_name, *args) #:nodoc:
  payload = {
    mailer: self.class.name,
    action: method_name
  }

  ActiveSupport::Notifications.instrument("process.action_mailer", payload) do
    lookup_context.skip_default_locale!

    super
    @_message = NullMail.new unless @_mail_was_called
  end
end