Wrapper.find() does not work in IE11 without polyfill

[markbrouch]

Version

1.0.0-beta.29

Reproduction link

https://github.com/eddyerburgh/vue-test-utils-karma-example

Steps to reproduce

Using Karma test runner in IE11 environment, run the Counter.spec.js test.

What is expected?

wrapper.find('button') should return a wrapper of the matching element.

What is actually happening?

No match is returned and an error is thrown that trigger must be provided a non-empty wrapper.

---

This is due to IE11 not supporting Element.matches(). Intead IE11 has the non-standard Element.msMatchesSelector(). MDN has a simple polyfill that should be implemented and solves this problem:

if (!Element.prototype.matches) {
  Element.prototype.matches = Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;
}

I'm happy to open a PR to fix this, I just don't know where the correct place to install this polyfill would be.

[eddyerburgh]

Thank you for raising this issue. Yes please raise a PR adding the polyfilll in