message: update UnderlineNavLink tests
diff: import React from 'react'
  import {ITEM_CLASS, SELECTED_CLASS} from '../UnderlineNav'
  import UnderlineNavLink from '../UnderlineNavLink'
  -import {render} from '../utils/testing'
  +import {render, rendersClass} from '../utils/testing'
  describe('Caret', () => {
  it('renders an <a> by default', () => {
  @@ -17,4 +17,12 @@ describe('Caret', () => {
  it('respects the "selected" prop', () => {
  expect(render(<UnderlineNavLink selected />)).toEqual(render(<a className={`${ITEM_CLASS} ${SELECTED_CLASS}`} />))
  })
  +
  + it('respects margin utility prop', () => {
  + expect(rendersClass(<UnderlineNavLink m={4} />, 'm-4')).toEqual(true)
  + })
  +
  + it('respects padding utility prop', () => {
  + expect(rendersClass(<UnderlineNavLink p={4} />, 'p-4')).toEqual(true)
  + })
  })
  