[Testing]: add more coverage for src/node/cli.ts

[jsjoeio]

For #TestingMondays, I'd like to increase our coverage for src/node/cli.ts. 293 is missing coverage.

We already have tests in place for parse.

To test this, we should create a test which uses a config file and adds an option that doesn't exist. We expect the function to throw an error with a specific message.