How can I speed up the writing of tests?

import React from 'react'
import { mount } from 'enzyme'

const getNodeList = (component) => {
  const nodeList = component.find('[data-el]')
  return nodeList
}

const getInfoList = (nodeList) => {
  const infoList = nodeList.map(node => {
    const name = node.name()
    const value = node.prop('data-el')
    const text = node.text()
    return { name, value, text }
  })
  return infoList
}

const getFuncList = (infoList) => {
  return infoList.map(info => {
    const { name, value, text } = info
    switch(name) {
      case 'h1': {
        const methods = {
          [`get${value}Text`]: () => text      // (1) We can add set/get/click methods too
        }
        return methods
      }
    }
  })
}

const getPageObject = (TagName, props = {}, render = mount) => {
  const component = render(<TagName {...props} />)
  const nodeList = getNodeList(component)
  const infoList = getInfoList(nodeList)
  const funcList = getFuncList(infoList)
  const pageObject = { ...funcList[0] }        // (2) We should iterate over this in a more generic way
  return pageObject
}

export default getPageObject

const HeroPage = (props) => (
    <section>
        <h1 data-el='Header'>{props.text}</h1>
    </section>
)

export default HeroPage

import getPageObject from './getPageObject'
import HeroPage from './HeroPage'

describe('<HeroPage /> component', () => {
  it('should have correct text', () => {
    const props = { text: 'hello' }
    const pageObject = getPageObject(HeroPage, props)
    expect(pageObject.getHeaderText()).toBe(props.text)  // (3) The 'getHeaderText' was auto-magically made!
  })
})