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 "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"
}
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;