Add more tests for checkboxes and radio buttons.

[jsdevel]

• Scenario 1 - Checkboxes
  • User submits a form with checkboxes.
  • cb is called with an error for the checkboxed input.
  • User unchecks or checks accordingly.
  • User can then submit the form again.
• Scenario 2 - Radio Buttons
  • User submits a form with radio buttons.
  • cb is called with an error for the radio input.
  • User selects a radio button.
  • User can then submit the form again.