Nate Fischer 5823ab18bb test(exec): add tests for coverage (#744)
* test(exec): add tests for coverage

No logic change.

This adds one test to cover some missing lines, and adds some `istanbul ignore`
directives.

I see 100% line coverage for `src/exec.js` when running:

```sh
$ nyc --reporter=text --reporter=lcov ava --serial test/exec.js`
```

Fixes #742

* Fix lint
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