Setting up tests with preact-cli project

Is there an article on setting this up with preact-cli created project? I have no doubt you are very busy so I will keep hacking, but if you know what's happening please let me know.

> TL;DR: `yarn && yarn test` on [my branch](https://github.com/01binary/ultravest-assistant/tree/PreactJsxChaiTroubleshoot)

`$ mocha --recursive --require babel-polyfill --compilers js:babel-register`

Gets me:
```
SyntaxError: d:/Desktop/ultravest-assistant/test/state/Component.tests.js: Unexpected token (12:9)
10 | it('any test that uses JSX', () => {
11 | // following taken from preact-jsx-chai readme
> 12 | expect(

).to.eql();
| ^
13 | });
14 | });
```
I have some other tests that don't use JSX and work. I ended up putting babel "env" preset into my `package.json` because I go to extreme lengths to keep my package root clean, but doing the same with `.babelrc` didn't make any difference. My package is customized from what `preact-cli` did, in an attempt to get tests to work:
```
{
"name": "ultravest-assistant",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"lint": "eslint src",
"test": "mocha --recursive --require babel-polyfill --compilers js:babel-register",
"start": "if-env NODE_ENV=production && npm run -s serve || npm run -s dev",
"build": "lint && preact build",
"serve": "preact build && preact serve",
"dev": "preact watch"
},
"keywords": [],
"author": "",
"license": "ISC",
"eslintConfig": {
"extends": "eslint-config-synacor"
},
"babel": {
"presets": [ "env" ]
},
"devDependencies": {
"babel-polyfill": "^6.26.0",
"babel-preset-env": "^1.6.0",
"babel-register": "^6.26.0",
"chai": "^4.1.2",
"eslint": "^4.6.1",
"eslint-config-synacor": "^1.1.1",
"if-env": "^1.0.0",
"mocha": "^3.5.0",
"preact-cli": "^1.4.1",
"sass-lint": "^1.11.1"
},
"dependencies": {
"node-sass": "^4.5.3",
"preact": "^8.2.5",
"preact-compat": "^3.17.0",
"preact-jsx-chai": "^2.2.1",
"react": "npm:preact-compat",
"recompose": "^0.25.0",
"sass-loader": "^6.0.6"
}
}
```
I am confused because error message indicates it's getting transpiled through babylon but it's still unhappy.