mocha programmatically set vue error handler

Question

I find myself writing this at the start of pretty much all of my unit tests in mocha:

it('should do something', (done) => {
  Vue.config.errorHandler = done;

  // do something aynchronous
});

By default, Vue catches all errors itself and logs them to the console, so mocha can't see them. This code makes sure that thrown errors fail the tests.

Is there a way with mocha to do this without having to start every single async test with this line of code? If I have to write / use a plugin, that's fine.

I don't use Mocha, but every test framework I've ever used has some kind of setup and teardown method to handle these kinds of things. — craig_h
– craig_h, Commented Nov 28, 2017 at 11:04
@craig_h yep, there's a beforeEach hook. It can only be used to fail the test before it runs, not during the testing stage. — callumacrae
– callumacrae, Commented Nov 28, 2017 at 11:05

wxsm · Accepted Answer · 2017-11-28 11:44:38Z

-1

Try:

Vue.config.errorHandler = function (err, vm, info) {
  throw err
}

in your test entry.

answered Nov 28, 2017 at 11:44

wxsm

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4 Comments

callumacrae Over a year ago

This won't work if the error handler is called in a promise.

wxsm Over a year ago

It works in my test. Try change your async test from done call to async functions. e.g. it('should...', async () => { //... }) @callumacrae

callumacrae Over a year ago

This fails: Vue.nextTick(() => { throw new Error('test'); }); - Vue.nextTick() uses promises internally.

wxsm Over a year ago

Well that was expected. A promise is designed to catch errs internally. If you insist to throw them you can do this

var originalCatch = Promise.prototype.catch; Promise.prototype.catch = function(){throw new Error();return originalCatch.apply(this, arguments);}

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