Question

105

Invalid Chai property when calling calledOnce

rated 0 times [ 106] [ 1] / answers: 1 / hits: 25718 / 7 Years ago, tue, july 25, 2017, 12:00:00

I'm having problems writing tests in JavaScript with Sinon and Chai.
I'm trying to check if a function is called on a spy and get I get

"Error: Invalid Chai property: calledOnce"

I'm doing the same thing in another project with the same test dependencies without any 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"

}

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leighrheac

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4 Years ago

answered 7 Years ago keric · Accepted Answer

You're just missing the sinon-chai package, that adds sinon-like assertions to 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 the stub or the original function both work:

var expect = chai.expect;



var udpSocketStub = this.sandbox.spy(udpSocket, 'send');



// Make a call

updSocket.send({..});



// Both should pass

expect(udpSocketStub).calledOnce;

expect(udpSocket.send).calledOnce;



// Identical, but more readable

expect(udpSocketStub).to.have.been.calledOnce;

expect(udpSocket.send).to.have.been.calledOnce;