javascript - Invalid Chai property when calling calledOnce -


i'm having problems writing tests in javascript sinon , chai. i'm trying check if function called on spy , "error: invalid chai property: calledonce"

i'm doing same thing in project same test dependencies without problem...

var udpsocketstub = this.sandbox.spy(udpsocket, 'send'); expect(udpsocketstub).calledonce; // should fail   "dependencies": {   "body-parser": "~1.17.1",   "bootstrap": "^4.0.0-alpha.6",   "chai": "^4.1.0",   "co-mocha": "^1.2.0",   "cookie-parser": "~1.4.3",   "debug": "~2.6.3",   "express": "~4.15.2",   "jquery": "^3.2.1",   "mocha": "^3.4.2",   "morgan": "~1.8.1",   "node-compass": "0.2.3",   "pug": "^2.0.0-rc.1",   "serve-favicon": "~2.4.2",   "sinon": "^2.3.8",   "sinon-chai": "^2.12.0" }

you're missing sinon-chai package, adds sinon-like assertions chai.

npm install --save sinon-chai

initialization: 

var chai = require('chai'); var sinon = require('sinon'); chai.use(require('sinon-chai'));

in case you're wondering, using stub or original function both work:

var expect = chai.expect;  var udpsocketstub = this.sandbox.spy(udpsocket, 'send');  // make call updsocket.send({..});  // both should pass expect(udpsocketstub).calledonce; expect(udpsocket.send).calledonce;  // identical, more readable expect(udpsocketstub).to.have.been.calledonce; expect(udpsocket.send).to.have.been.calledonce;

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