Hush console errors for tests with invalid props

[shawnbot]

This deploys a couple of strategically placed Jest mocks to silence console.error() for tests that render invalid props. Here's the pattern:

import {render} from '../utils/testing'

it('ignores invalid "foo" prop', () => {
  const hush = jest.spyOn(console, 'error').mockImplementation(jest.fn())
  expect(render(<MyComponent foo="bar" />).props.foo).toEqual(undefined)
  hush.mockRestore()
})

[emplums]

Looks good!