Test runner doesn't return correct failure code if run in node script

Take this setup for example:

- Node script that looks like this:
```
"scripts": {
"prequnit": "webpack --config ./webpack.config-qunit.js",
"qunit": "node ./scripts/runQunit.js",
}
```

The pre step compiles the necessary entry files for the tests. Then the runQunit.js file looks like this:

```
const qunit = require('node-qunit-phantomjs'); // eslint-disable-line

qunit('./src/test/resources/qunit/test1.js.html', {verbose: true});
qunit('./src/test/resources/qunit/test2.js.html', {verbose: true});
qunit('./src/test/resources/qunit/test3.js.html', {verbose: true});
```

If one of those tests fail, it prints an error to the console, but doesn't return a valid error code that would kill something like CircleCI. Is there a flag in the nodeJS implementation to cause the script to fail completely if any of the qunit calls fail?