* Added tests and refinements as tests indicate.
* Building out the test suite.
* web: test the simple things. Fix what the tests revealed.
- Move `EmptyState.test.ts` into the `./tests` folder.
- Provide unit tests for:
- Alert
- Divider
- Expand
- Label
- LoadingOverlay
- Give all tested items an Interface and a functional variant for rendering
- Give Label an alternative syntax for declaring alert levels
- Remove the slot name in LoadingOverlay
- Change the slot call in `./enterprise/rac/index.ts` to not need the slot name as well
- Change the attribute names `topMost`, `textOpen`, and `textClosed` to `topmost`, `text-open`, and
`text-closed`, respectively.
- Change locations in the code where those are used to correspond
** Why interfaces: **
Provides another check on the input/output boundaries of our elements, gives Storybook and
WebdriverIO another validation to check, and guarantees any rendering functions cannot be passed
invalid property names.
** Why functions for rendering: **
Providing functions for rendering gets us one step closer to dynamically defining our forms-in-code
at runtime without losing any type safety.
** Why rename the attributes: **
A *very* subtle bug:
[Element:setAttribute()](https://developer.mozilla.org/en-US/docs/Web/API/Element/setAttribute)
automatically "converts an attribute name to all lower-case when called on an HTML element in an
HTML document." The three attributes renamed are all treated *as* attributes, either classic boolean
or stringly-typed attributes, and attempting to manipulate them with `setAttribute()` will fail.
All of these attributes are presentational; none of them end up in a transaction with the back-end,
so kebab-to-camel conversions are not a concern.
Also, ["topmost" is one word](https://www.merriam-webster.com/dictionary/topmost).
** Why remove the slot name: **
Because there was only one slot. A name is not needed.
* Fix minor spelling error.
058a388518