fix(test): enforce diff dry-run exit code

[zengxm1979]

Summary

Fixes the test diff --dry-run path so it preserves the documented CI-gate behavior when the emitted sample shows a verdict change.

Root cause

The real test diff path prints the diff and throws CLIError(..., 1) when verdictChanged is true. The dry-run path prints a canned sample with verdictChanged: true, but returned successfully before reaching the same exit-1 gate.

Change

• After printing the dry-run sample, throw the same verdict-difference CLIError when sample.verdictChanged is true.
• Update the dry-run unit test to assert both behaviors: JSON output is still emitted offline, and the command rejects with exitCode: 1.

Workflow note

Issue #286 has been claimed with /assign per the contribution workflow.

Validation

• npm test -- src/commands/test.test.ts -t "runDiff"
• npm run typecheck
• npm run lint
• npm run format:check

All checks passed locally on Node v24.15.0 / npm 11.12.1.

Closes #286

[coderabbitai]

Walkthrough

test diff --dry-run now throws exit code 1 when its sample changes verdicts. The regression test captures and validates the emitted JSON, including run identifiers, verdict changes, and changed-step status transitions.

Changes

Dry-run verdict gate

Layer / File(s)	Summary
Enforce and validate dry-run exit behavior src/commands/test.ts, src/commands/test.test.ts	The dry-run path throws CLIError with exit code 1 when verdictChanged is true, while tests validate the JSON output and rejection behavior.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• TestSprite/testsprite-cli#168: Updates the same runDiff dry-run handling and related assertions.

Suggested reviewers: ruili-testsprite, zeshi-du

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR implements the requested dry-run exit-1 gate and adds a regression test for the verdict-change case.
Out of Scope Changes check	✅ Passed	The changes stay focused on the dry-run exit behavior and its test coverage.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: enforcing the diff dry-run exit code behavior.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

✅ This PR is linked to an issue assigned to @zengxm1979 — thanks! The needs-issue label has been removed.