Calc functions tests

[pamelalozano16]

Context: Calc functions proposal
[skip dart-sass]

[Goodwine]

Nit, you want to add [skip dart-sass] in your PR description so the CI checks don't run the tests against the current dart sass version

You can also run npm run lint-spec -- --fix to automatically fix linter errors

[Goodwine]

LGTM but I'll leave it to Jen to do a final approval.

Note that if you get an approval, you should not submit until both PRs are approved since they should be merged roughly at the same time.

[jathak]

Looking at the spec (both ours and the CSS spec), I realize now that I mistakenly had the impression (and then shared that with you) that these new math functions have to be contained within another calc to work (MDN was unhelpful here its examples for sqrt and most of the other functions did have them nested).

In actuality, code like

a {
  b: sqrt(4);
}

is valid and the sqrt(4) should simplify to 2.

Given that, most of these tests should just have sqrt without a calc wrapping them (maybe have one test like that to test the nesting). They otherwise look good (though I'll wait to give final approval until all of the functions are implemented/tested).

Sorry for the confusion!