rspec be nil 和 be_nil 有什么区别 [英] rspec what is the difference between be nil and be_nil

问题描述

我正在使用 rspec 和断言之类的

I am using rspec and for asserts like

student.name should be nil
student.name should be_nil

两者似乎都有效.使用 be nil 和 be_nil 有什么区别???

Both seem to work. is there a difference between using be nil an be_nil ???

推荐答案

实际上没有区别，除了 be nil 被动态定义，而 be_nil 已经被定义由 rspec 专门编程.

There is no difference really, except be nil gets defined on the fly, and be_nil has been specifically programmed by rspec.

当你说should.be something时，rspec会尝试以下

when you say should.be something, rspec tries the following

   [:==, :<, :<=, :>=, :>, :===].each do |operator|
      define_method operator do |operand|
        BeComparedTo.new(operand, operator)
      end
    end

然而，当你尝试 should.be_nil 时，它只是检查

Whereas, when you try should.be_nil it just checks

object.nil?

https://github.com/rspec/rspec-expectations/blob/master/lib/rspec/matchers/built_in/be.rb

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