chore: fix erroneously failing test in formatter_test.go

[MichaelDoyle]

The behavior was changed in #3931

Checklist (if applicable):

• PR title is following https://www.conventionalcommits.org/en/v1.0.0/
• Tested (manually, unit tested, etc.)
• Docs updated (updated docs or a docs bug required)

Currently PRs have failing checks:

[gemini-code-assist]

Summary of Changes

Hello @MichaelDoyle, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a failing test in formatter_test.go. The test case TestResolveFormat was updated to correctly reflect the current behavior of the resolveFormat function, which now defaults to OutputFormatJSON when a schema is present but no specific format is given. This change ensures the test suite accurately validates the intended logic following a previous behavior modification in PR #3931.

Highlights

• Test Correction: Corrected an erroneously failing test case in formatter_test.go that was not aligned with recent behavior changes.
• Default Format Logic: Updated the TestResolveFormat test to assert that resolveFormat defaults to OutputFormatJSON when a schema is present but no explicit format is provided, reflecting the behavior introduced in PR fix(go/ai): fixed format resolution + prompt variants metadata #3931.

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[gemini-code-assist]

Code Review

This pull request correctly fixes a failing test in formatter_test.go. The test for resolveFormat was updated to assert that the default format is json when a schema is present but no format is specified, which aligns with the function's implementation. The test name and assertions are now correct, and a misleading comment has been removed. The change is accurate and improves the reliability of the test suite.