mocha-junit-reporter programatically

I'm trying to use mocha-junit-reporter programmatically but it doesn't seem to work. My code below:

```
var reporterOptions = {
"mocha-junit-reporter": {
reporterOptions: {
mochaFile: "./test-reports/unit-test-report.xml"
}
},
spec: "-",
};

mocha({
reporter: "mocha-multi",
reporterOptions: reporterOptions

})
```