message: add m & p tests to BranchName
diff: import React from 'react'
  import BranchName from '../BranchName'
  -import {render} from '../utils/testing'
  +import {render, renderClasses} from '../utils/testing'
  describe('BranchName', () => {
  it('renders an <a> by default', () => {
  @@ -18,4 +18,12 @@ describe('BranchName', () => {
  it('renders href={null} if tag != "a"', () => {
  expect(render(<BranchName tag="span" href="#" />).props.href).toEqual(null)
  })
  +
  + it('respects margin utility prop', () => {
  + expect(renderClasses(<BranchName m={1} />)).toEqual(['branch-name', 'm-1'])
  + })
  +
  + it('respects padding utility prop', () => {
  + expect(renderClasses(<BranchName p={1} />)).toEqual(['branch-name', 'p-1'])
  + })
  })
  