Refactor Test Application

[Westbrook]

Code of conduct

• [X] I agree to follow this project's code of conduct.

Description of issue

Tests have been added to the project in a fairly ad hoc manner throughout its history. Refactoring tests to be delivered in via the following follows would make for component to component consistency and for a more clear destination for additional test contexts over time:

• declarative.test.ts: test all declarative usage of the element in question
• imperative.test.ts: all imperative interactions
• keyboard.test.ts: all keyboard interactions
• a11y-tree.test.ts: the delivered a11y tree across various states
• controlled.test.ts: that the element can be "controlled" by the parent application
• etc.

To Dos:

• [x] accordion
• [ ] action-bar
• [ ] action-button
• [ ] action-group
• [ ] action-menu
• [ ] alert-dialog
• [ ] asset
• [ ] avatar
• [ ] badge
• [ ] banner
• [ ] button
• [ ] button-group
• [ ] card
• [ ] checkbox
• [ ] clear-button
• [ ] close-button
• [ ] coachmark
• [ ] color-area
• [ ] color-field
• [ ] color-handle
• [ ] color-loupe
• [ ] color-slider
• [ ] color-wheel
• [ ] combobox
• [ ] dialog
• [ ] divider
• [ ] dropzone
• [ ] field-group
• [ ] field-label
• [ ] help-text
• [ ] icon
• [ ] icons
• [ ] icons-ui
• [ ] icons-workflow
• [ ] iconset
• [ ] illustrated-message
• [ ] infield-button
• [ ] link
• [ ] menu
• [ ] meter
• [ ] modal
• [ ] number-field
• [ ] opacity-checkerboard
• [ ] overlay
• [ ] picker
• [ ] picker-button
• [ ] popover
• [ ] progress-bar
• [ ] progress-circle
• [ ] quick-actions
• [ ] radio
• [ ] search
• [ ] sidenav
• [ ] slider
• [ ] split-button
• [ ] split-view
• [ ] status-light
• [ ] swatch
• [ ] switch
• [ ] table
• [ ] tabs
• [ ] tags
• [ ] textfield
• [ ] thumbnail
• [ ] toast
• [ ] tooltip
• [ ] top-nav
• [ ] tray
• [ ] underlay
• [ ] base
• [ ] bundle
• [ ] grid
• [ ] opacity-checkerboard
• [ ] reactive-controllers
• [ ] shared
• [ ] styles
• [ ] theme
• [ ] truncated

[najikahalsema]

The meat of this work will be addign tests to the controlled test group.