LGTM.com - false positive

**Description of the false positive**

I'm getting alerts for a test file that verifies the correctness of encryption routines. I can declare it as test code using .lgtm.yml, but maybe this shouldn't be flagged at all.

https://lgtm.com/projects/g/AlCalzone/node-zwave-js/snapshot/ecc16f7c6ff22f6192a12080daaf8015760bc0f3/files/packages/core/src/security/crypto.test.ts?sort=name&dir=ASC&mode=heatmap