javascript - How can I test that a callback *doesn't* get run? -

javascript - How can I test that a callback *doesn't* get run? -

i test particular function not run callback during test. eg, in simplified code below, checker.check() checks numbers, , numbers given in particular test should not run callback.

test('do not raise false alerts', function(done){ var checker = setupchecker(function(){ done('bad alert') }) checker.check(60) checker.check(70) checker.check(80) })

essentially test timeout if done() never called.

i of course of study utilize settimeout() purpose, thought there might built mocha purpose.

i add together sec callback checker() when alert shouldn't raised, strikes me test-induced design damage , i'd avoid that.

the best place such kind of assertion exit event of process, because nil can happen after (well, except other exit listeners, maintain in mind):

test('do not raise false alerts', function(){ var badalert = false; var checker = setupchecker(function(){ badalert = true }) process.on('exit', function () { assert.ok(!badalert); }); checker.check(60) checker.check(70) checker.check(80) })

unfortunately pattern doesn't work nice mocha. show test passes , stack trace in case of failure.

javascript node.js unit-testing mocha