metamask-extension/test/setup.js

require('@babel/register')({
  ignore: [name => name.includes('node_modules') && !name.includes('obs-store')],
})

require('./helper')

window.SVGPathElement = window.SVGPathElement || { prototype: {} }
window.fetch = window.fetch || function fetch () {
  return Promise.resolve()
}
global.indexedDB = {}
global.fetch = global.fetch || function fetch () {
  return Promise.resolve()
}