RSpec:“should == ..."之间的区别；和“应该 eql(...)"； [英] RSpec: difference between "should == ..." and "should eql(...)"

问题描述

在 RSpec 中，使用 should == ... 和 should eql(...) 有什么区别?我注意到 RSpec 文档总是使用 eql，但 == 输入更少且更易于阅读.我错过了什么?

In RSpec, what's the difference between using should == ... and should eql(...)? I noticed that the RSpec documentation always uses eql, but == is less typing and easier to read. What am I missing?

推荐答案

其实很简单:should == 将 == 消息发送给测试对象，should eql 向测试对象发送eql? 消息.换句话说:两个不同的测试发送两个完全不同的消息，它们调用两个完全不同的方法，从而做两个完全不同的事情.特别是，eql? 比 == 更严格，但不如 equals? 严格.

It's rather simple, really: should == sends the == message to the test subject, should eql sends the eql? message to the test subject. In other words: the two different tests send two completely different messages which invoke two completely different methods and thus do two completely different things. In particular, eql? is stricter than == but less strict than equals?.

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