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The expect assertions within Chai are known as Behavior Driven Development (BDD). This style of assertion is completely oriented around the behavior of your application's state, and is written in a manner that makes it very easy to understand which behavior is being tested for. Chai also supports another BDD style assertion keyword, the should assertion:

let should = chai.should();Foobar.should.be.a('string'); Foobar.should.equal('foobar'); Foobar.should.have.lengthOf(6);http.get(123, function (err, data) {     should.not.exist(err);     should.exist(data);     data.should.be.an('object'); });

The should assertion is an alternative way in Mocha to write the same types of Chai assertions as the expect assertion keyword, but with what ...