What happens in tests when the requested port is in use? What's verified?

I don't have visibility into the test files in the indexed repository. The thin index coverage (8 of 8 eligible files) doesn't include test code that would show what's verified when a requested port is in use.

However, based on the README excerpt provided, here's what the library's behavior should be when a requested port is unavailable:

• If you pass a single preferred port (e.g., port: 3000), the library "will use 3000 if available, otherwise fall back to a random port"
• If you pass an array of preferred ports (e.g., port: [3000, 3001, 3002]), it "will use any element in the preferred ports array if available, otherwise fall back to a random port"
• You can also use the exclude option to skip certain ports

To see what the actual tests verify, you'd need to examine the test files directly (likely in a test/ or spec/ directory). The most plausible entry point would be the main implementation file, which you can read to understand the fallback logic.

FOLLOW_UPS:

• How does the library detect port availability?
• What does the reserve option do exactly?
• How does portNumbers() helper function work?