test: add --ca-cert coverage to validate.test.ts

[sonukapoor]

PR #464 added unit tests for src/cli/validate.ts but missed the --ca-cert validation branch (lines 29–35). Two cases need to be added:

• Throws with a --ca-cert: prefix when the cert file does not exist or is invalid
• Does not throw when --ca-cert is not set

The ca-cert validation delegates to validateCaCertFile, so only the error-wrapping behaviour needs to be exercised here, not the file-read internals.

[AbhishekNagar07]

Hi! I would love to tackle this and add the missing --ca-cert test coverage for both the throw and non-throw cases. Could you please assign it to me?

[sonukapoor]

Hi @AbhishekNagar07 - Thanks for the offer. I have assigned the issue to you. Let me know if you need anything. 👍