styled-system getter bug test case

readme.md

instructions

1. clone this gist
2. npm install to install styled-system, babel, and jest
3. npm test to run the test

package.json

{
  "private": true,
  "scripts": {
    "test": "jest"
  },
  "dependencies": {
    "babel-preset-env": "1.7.0",
    "jest": "23.4.1",
    "styled-system": "3.0.2"
  },
  "babel": {
    "presets": [
      "env"
    ]
  }
}

test.js

import {themeGet} from 'styled-system'

it('returns 0', () => {
  const theme = {
    border: [0, 2, 4]
  }
  expect(themeGet('border.0')(theme)).toEqual(0)
})