node.js how to get better error messages for async tests using mocha

Question

A typical test in my node.js mocha suite looks like the following:

 it(\"; client should do something\", function(done) {
    var doneFn = function(args) {
          


        

Answer 1

You should to listen to uncaughtException events, in addition to someEvent. This way you'll catch errors happening in client, and those will show up in your test report.

 it("; client should do something", function(done) {
    var doneFn = function(args) {
      // run a bunch of asserts on args
      client.events.removeListener(client.events.someEvent, userMuteFn);
      done();
    }

    var failedFn = function(err) {
      client.events.removeListener('uncaughtException', failedFn);
      // propagate client error
      done(err);
    }
    client.events.on(someEvent, doneFn);

    client.events.on('uncaughtException', failedFn);

    client.triggerEvent();
});

P.S. In case client is a child process, you also should listen to exit event, which will be triggered in case the child process dies.