test: capture valid json output with policy

[thisislawatts]

Pull Request Submission Checklist

• Follows CONTRIBUTING guidelines
• Includes detailed description of changes
• Contains risk assessment (Low | Medium | High)
• Highlights breaking API changes (if applicable)
• Links to automated tests covering new functionality
• Includes manual testing instructions (if necessary)
• Updates relevant GitBook documentation (PR link: ___)

What does this PR do?

Stepping back through the versions of snyk-policy the bug seems to have been introduced by adopting the vite bundler in version 3.0
Release v3.0.0 · snyk/policy

With v2.0.8, the CLI works as expected outputting valid JSON.

I have added an acceptance test for this behaviour with the CLI.
Note that the first line of stdout includes: snyk:module [email protected] => { name: "cxct", version: "0.0.1-security" } +0ms

You can get the test to pass by installing an older version of the CLI and injecting that to your tests:

export TEST_SNYK_COMMAND=/path/to/snyk
npx jest cli-json-output.spec.ts