* Added a handful of SSR unit tests, ported from a previous pull request.
* Fixing linting errors
* Fixed a test helper function to properly report errors.
* Un-nested the new rendering tests. Updated the fiber test passing/not passing lists.
* Edited to comply with the react/jsx-space-before-closing eslint rule, which will soon be merged into master.
* Response to code review from @spicyj. Moved tests to separate file, reworked wording of test names, corrected use of canUseDom, and simplified tests against tagName. Thanks for the help, @spicyj!
* Converted the unit tests to use async-await style.
* Moved async-await babel transform for tests from .babelrc to preprocessor.js.
* Response to code review in PR #9089. Thanks, @spicyj!
* Fixing some bugs in the SSR unit tests.
* Missed deleting some repeated code in the last commit.
* Adding unit tests for property to attribute mapping in SSR.
* Removing some redundant unit tests.
* Oops. I forgot to re-run record-tests after c593dbc; fixing that here.
* Reformatting for prettier so that the build will pass.
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