Method for quickly generating jest spy boilerplate given a list of stringified module dot class

jest-spy-generator.js

function generateSpyFromMethod (mthdList) {
  const top = []
  const bottom = []
  mthdList.forEach(function (mthd) {
    const spl = mthd.split('.')
    let first = spl[0]
    let last = spl[1]
    first = first[0].toLowerCase() + first.slice(1)
    last = last[0].toUpperCase() + last.slice(1)
    const spyVar = `${first}${last}Spy`
    top.push(`let ${spyVar}`)
    bottom.push(`
      ${spyVar} = spyOn(
        ${spl[0]},
        '${spl[1]}'
      )
    `)
  })
  return (`
    ${top.join('\n')}

    beforeEach(() => {
      ${bottom.join('\n')}
    })
  `)
}