O sinon-chai estende o Chai com asserções expressivas para spies e stubs do Sinon.js.
Configuração e Inicialização
var sinon = require('sinon')
require('chai').use(require('sinon-chai'))
Asserções no estilo Expect
expect(spy).called
expect(spy).calledOnce
expect(spy).calledTwice
expect(spy).calledThrice
expect(spy).calledBefore(otherSpy)
expect(spy).calledAfter(otherSpy)
expect(spy).calledWithNew
expect(spy).alwaysCalledWithNew
expect(spy).calledOn(context)
expect(spy).alwaysCalledOn(context)
expect(spy).calledWith(...args)
expect(spy).alwaysCalledWith(...args)
expect(spy).calledWithExactly(...args)
expect(spy).alwaysCalledWithExactly(...args)
expect(spy).calledWithMatch(matcher)
expect(spy).alwaysCalledWithMatch(matcher)
expect(spy).returned(returnValue)
expect(spy).alwaysReturned(returnValue)
expect(spy).threw(errorOrType)
expect(spy).alwaysThrew(errorOrType)
Asserções no estilo Should
spy.should.have.been.called
spy.should.have.been.calledOnce
spy.should.have.been.calledTwice
spy.should.have.been.calledThrice
spy1.should.have.been.calledBefore(spy2)
spy1.should.have.been.calledAfter(spy2)
spy.should.have.been.calledWithNew
spy.should.always.have.been.calledWithNew
spy.should.have.been.calledOn(context)
spy.should.always.have.been.calledOn(context)
spy.should.have.been.calledWith(...args)
spy.should.always.have.been.calledWith(...args)
spy.should.have.been.calledWithExactly(...args)
spy.should.always.have.been.calledWithExactly(...args)
spy.should.have.been.calledWithMatch(matcher)
spy.should.always.have.been.calledWithMatch(matcher)
spy.should.have.returned(returnVal)
spy.should.have.always.returned(returnVal)
spy.should.have.thrown(errorObjOrString)
spy.should.have.always.thrown(errorObjOrString)