如何在irb中使用RSpec期望值

Question

我想[1,2,3].should include(1)在irb中使用.我试过了:

~$ irb
1.9.3p362 :001 > require 'rspec/expectations'
 => true 
1.9.3p362 :002 > include RSpec::Matchers
 => Object 
1.9.3p362 :003 > [1,2,3].should include(1)
TypeError: wrong argument type Fixnum (expected Module)
    from (irb):3:in `include'
    from (irb):3
    from /home/andrey/.rvm/rubies/ruby-1.9.3-p362/bin/irb:16:in `<main>'

但它不起作用虽然它是一个有效的案例.我该怎么用[1,2,3].should include(1)？

Answer 1

你很亲密,但是打电话include到顶级你会打电话Module#include.要绕过它,您需要删除原始的include方法,以便include调用RSpec .

首先让我们弄清楚系统的include来源:

> method :include
=> #<Method: main.include>

好.它看起来像是在定义中main.这是Ruby顶级对象.所以让我们重命名并删除原来的包含:

> class << self; alias_method :inc, :include; remove_method :include; end

现在我们可以开展业务了:

> require 'rspec'
> inc RSpec::Matchers
> [1,2,3].should include(1)
=> true