Fix test warnings and console errors.

[ElbertTse]

When running tests, tests will pass but will log errors on the console. One source of the errors appears to be coming from using feather icons in the Calendar Button component. This is the only component being tested that is logging errors.

[ElbertTse]

Leaving as open, low priority. Branch this is addressed on is bugfix/icon-test-fix. Currently, the icon is replaced by a calendar emoji. This functionally satisfies the role of the icon but visually, it is hard to tell that the emoji is a button.