Incorrectly ignores 0 as a value

[chriskrycho]

To reproduce:

testSelector('foo', 0);

The expected value is [data-test-foo="0"]. The actual value is [data-test-foo].

Workaround: convert to a string:

testSelector('foo', `${0}`);

---

I ran into this because I have a small helper that wraps this and passes in an ID, so:

mySelector = id => testSelector('foo', id);

This works normally, unless the id is 0.

[marcoow]

Thanks for reporting - should be pretty easy to fix if you (or anyone) wants to submit a PR.