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import { publish, subscribe } from '~/lib/utils/pubsub';
describe('Pub/sub messaging', () => {
it('sends and receives messages asynchronously', done => {
const receiver1 = jest.fn();
const receiver2 = jest.fn();
const receiver3 = jest.fn();
subscribe('namespace:topic', receiver1);
subscribe('namespace:topic', receiver2);
subscribe('namespace:topic2', receiver3);
publish('shoudnotreceive', 'shouldnotreceive');
publish('namespace:topic', 1);
publish('namespace:topic', 2);
publish('namespace:topic2', 3);
// Receivers should not be called synchronously
expect(receiver1).not.toHaveBeenCalled();
expect(receiver2).not.toHaveBeenCalled();
expect(receiver3).not.toHaveBeenCalled();
setImmediate(() => {
expect(receiver1.mock.calls).toEqual([[1], [2]]);
expect(receiver2.mock.calls).toEqual([[1], [2]]);
expect(receiver3.mock.calls).toEqual([[3]]);
done();
});
});
it('allows clients to unsubscribe', done => {
const receiver = jest.fn();
const unsubscribe = subscribe('topic', receiver);
publish('topic', 1);
unsubscribe();
publish('topic', 2);
setImmediate(() => {
expect(receiver.mock.calls).toEqual([[1]]);
done();
});
});
});
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