CODEWITHSUNDEEP
node.jstestingmocha.jschild-processchai
Giovane Boaviagem
Giovane Boaviagem

Reputation: 86

How do I test child processes using chai and mocha?

I'm creating a framework to execute processes at a specific time (cron-like) and to test it I'm using chai-mocha-grunt.

The architecture of solution is based on this example. Basically, we have:

With this architecture how do I test to ensure that threads are executed at the correct time using mocha and chai (with the 'assert' library)?

In other words, how do I make chai 'listen' to the threads and check if they are executed at the correct time?

Upvotes: 2

Views: 1932

Answers (1)

Andrew Lavers
Andrew Lavers

Reputation: 8151

I'm not sure you need chai itself to listen to your threads. If you're building off of the example you linked this should be pretty straight forward because the Master.js is already an EventEmitter and it's already emitting all events it hears from the child processes.

Your test structure could be as simple as this:

describe('ForkExample test', function() {
    // Set an appropriate test timeout here
    this.timeout(1000);

    it('should do stuff at the right time', function(done) {
        var fe = new ForkExample();
        fe.start(1);
        fe.on('event', function(type, pid, e) {
            if (type === 'child message') {
                // Check here that the timing was within some expected range
                done();
            }
        });
    });
});

Upvotes: 1

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