fix(UNSTABLE__pagination): add a11y and unit tests (#327)

* fix(unstable-pagination): add initial tests for a11y, page size, and page select

* fix(unstable-pagination): add tests for next/previous buttons

* fix(unstable-pagination): add tests for totalitems, unknownpages, and diff text props

* chore(unstable-pagination): formatting and comment updates

* fix(unstable-pagination): add tab order test

* chore(unstable-pagination): fix test name

* fix(unstable-pagination): split up last test

* fix(pagination): use namespace vars in tests

* fix(unstable-pagination): remove duplicate dependency and update yarn lock

* chore: update testing-library/user-event version

* fix(unstable-pagination): rename test file, add tests for checking root class

* docs(unstable-pagination): add notes about testing page selector

* docs(unstable-pagination): update top-of-file comments

* fix(pagination): remove page selector test

* fix(unstable-pagination): add class name and spread attribute tests

package.json

@@ -101,7 +101,7 @@
     "@storybook/theming": "^5.2.4",
     "@testing-library/jest-dom": "^4.2.4",
     "@testing-library/react": "^9.3.2",
-    "@testing-library/user-event": "^8.0.3",
+    "@testing-library/user-event": "^8.1.0",
     "autoprefixer": "^9.4.10",
     "axe-core": "^3.4.1",
     "babel-eslint": "^10.0.1",