Using start-env to set env to "test" and using babel's "env" option doesn't work well

[laggingreflex]

I have a task like this:

const test = () => start(
    env('NODE_ENV', 'test')
    mochista(...)
)

and .babelrc like this:

  "env": {
    "test": {
      "plugins": [
        "istanbul",

It turns out the plugin "istanbul" isn't actually used.

Probably because I'm also using start-babel-cli which already loads babel-register before the test task has had the chance to set NODE_ENV which babel uses to load the plugin.