How to test Reflux actions with Jest - jasmine

Question

I'm having difficulty testing that Reflux actions are triggering correctly in my application, and in fact they do not seem to be working at all with Jest. I have this example test:
jest.autoMockOff();
describe('Test', function () {
it('Tests actions', function () {
var Reflux = require('../node_modules/reflux/index');
var action = Reflux.createAction('action');
var mockFn = jest.genMockFn();
var store = Reflux.createStore({
init: function () {
this.listenTo(action, this.onAction);
},
onAction: function () {
mockFn();
}
});
action('Hello World');
expect(mockFn).toBeCalled();
});
});
Which outputs:
● Test › it Tests actions
- Expected Function to be called.
at Spec.<anonymous> (__tests__/Test.js:20:20)
at Timer.listOnTimeout [as ontimeout] (timers.js:112:15)
Even with Jasmine async functions it doesn't seem to be working
jest.autoMockOff();
describe('Test', function () {
it('Tests actions', function () {
var Reflux = require('../node_modules/reflux/index');
var action = Reflux.createAction('action');
var mockFn = jest.genMockFn();
var flag = false;
var store = Reflux.createStore({
init: function () {
this.listenTo(action, this.onAction);
},
onAction: function () {
mockFn();
flag = true;
}
});
runs(function () {
action();
});
waitsFor(function () {
return flag;
}, 'The action should be triggered.', 5000);
runs(function () {
expect(mockFn).toBeCalled();
});
});
});
gives me...
FAIL __tests__/Test.js (6.08s)
● Test › it Tests actions
- Throws: [object Object]
Has anybody made this work?

Answer 1

I figured it out! I just needed to use Jest's own methods for fast-forwarding any timers. i.e. just add the line
jest.runAllTimers();
So the working version of my first example would be
jest.autoMockOff();
describe('Test', function () {
it('Tests actions', function () {
var Reflux = require('../node_modules/reflux/index');
var action = Reflux.createAction('action');
var mockFn = jest.genMockFn();
var store = Reflux.createStore({
init: function () {
this.listenTo(action, this.onAction);
},
onAction: function () {
mockFn();
}
});
action('Hello World');
jest.runAllTimers();
expect(mockFn).toBeCalled();
});
});