javascript - How do async tests work in intern? -

how asynchronous tests work in intern testing framework? have tried them run in example, async test passes without waiting callback run.

it('should connect in 5 seconds', function () {     var dfd = this.async(5000);     conn.connect(credentials, dfd.callback(function(result) {         expect(result).to....     })); } 

the test passes immediately. doing wrong?

dfd.callback doesn’t execute until executed. keep in mind designed promise callbacks (i.e. function passed promise.then), not node.js-style callbacks argument might error (i.e. function (error, result) {}). not check see if error passed argument.

without knowing conn is, seeing how passing dfd.callback argument not promise, suspicion trying use node.js-style callback , call erroring immediately. may provide convenience wrapper these types of callbacks in future convert them promise interface, until then, need this:

it('should connect in 5 seconds', function () {     var dfd = this.async(5000);     conn.connect(credentials, dfd.callback(function(error, result) {         if (error) {             throw error;         }          expect(result).to....     })); }); 

otherwise, without knowing conn , seeing actual assertion is, it’s hard issue here. long nothing inside callback throws error, test considered successful.

edit: based on comments above sounds callback event listener called multiple times different information. in case, this:

it('should connect in 5 seconds', function () {     var dfd = this.async(5000);     conn.connect(credentials, dfd.rejectonerror(function (result) {         if (result !== 'what want') {             return;         }          expect(result).to....         // other tests…          // nothing threw error, successful test         dfd.resolve();     })); }); 

dfd.rejectonerror works dfd.callback except not automatically resolve promise; @ end.