Add comprehensive test coverage for agent metadata updates

[continue-development-app]

Summary

This PR adds comprehensive test coverage for the agent metadata update refactoring in PR #9285.

Closes #9294

Changes

New Test File:

Created a comprehensive test suite with 48 test cases covering:

• ✅ Backward compatibility with old function signature
• ✅ New isComplete and hasChanges functionality
• ✅ Diff stats collection (additions/deletions)
• ✅ Summary extraction from conversation history
• ✅ Session usage tracking (cost, tokens, cache metrics)
• ✅ Combined metadata behavior
• ✅ Error handling and graceful degradation
• ✅ Edge cases and boundary conditions

Enhanced Test File:

Added 16 new test cases for:

• getAgentIdFromArgs - Command line argument parsing
• postAgentMetadata - API client error handling, complex metadata scenarios

Documentation:

Comprehensive documentation describing:

• Test organization and strategy
• Coverage goals and testing principles
• Instructions for running tests
• Future improvement areas

Test Coverage Highlights

Backward Compatibility

Ensures existing code continues to work:

• Old signature: updateAgentMetadata(history)
• New signature: updateAgentMetadata({ history, isComplete })

New Features

Tests the completion tracking functionality:

• isComplete flag is properly set on final update
• hasChanges is correctly determined from git diff

Error Resilience

All error paths are tested:

• Git operations can fail without breaking metadata updates
• Network errors don't crash the agent
• Missing data is handled gracefully
• Errors are logged but never thrown

Mocking Strategy

Comprehensive mocking of dependencies:

• Git operations (getGitDiffSnapshot)
• Metadata utilities (calculateDiffStats, extractSummary)
• Session management (getSessionUsage)
• API client (post)
• Logger (for verification)

Running Tests

cd extensions/cli
npm test -- src/util/exit.test.ts      # Run new tests
npm test -- src/util/metadata.test.ts  # Run enhanced tests
npm test                                # Run all tests

Key Testing Principles

1. Non-Throwing: All functions are tested to catch and log errors, never throw
2. Graceful Degradation: If one metadata collector fails, others continue
3. Backward Compatibility: Old API consumers work unchanged
4. Isolation: Each test is independent with proper setup/teardown
5. Comprehensive: Success paths, error paths, and edge cases all covered

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This task was co-authored by peter-parker and Continue.

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Summary by cubic

Adds comprehensive test coverage for the refactored agent metadata updates, validating backward compatibility, completion flags, diff/summary/usage collection, and error resilience. Improves reliability of metadata posting and prevents regressions.

• Test Coverage

  • New exit.test.ts with 48 cases for legacy/new signatures, isComplete/hasChanges, diff stats, summary, usage, combined behavior, agent ID checks, and error handling.
  • Enhanced metadata.test.ts with 16 cases for getAgentIdFromArgs and postAgentMetadata, including API/auth/network failure handling and complex payloads.
  • Added TEST_COVERAGE.md describing strategy and how to run tests.

• Dependencies

  • Lockfile updates: @aws-sdk/client-bedrock-runtime and @aws-sdk/credential-providers to 3.931.0 in extensions/cli.

^{Written for commit 01e1140. Summary will update automatically on new commits.}

[cubic-dev-ai]

No issues found across 5 files

[continue]

✅ Documentation Review Complete

This PR adds comprehensive test coverage for internal CLI agent metadata functionality. After reviewing the changes:

No documentation updates are needed because:

• ✅ Changes are purely internal test coverage
• ✅ No new user-facing features or APIs
• ✅ No changes to CLI commands, flags, or behavior
• ✅ Existing user-facing documentation already covers agent metadata and monitoring
• ✅ The TEST_COVERAGE.md file is appropriate as internal developer documentation in the source code

The PR appropriately documents the test strategy and coverage within the codebase itself, which is the right place for this type of technical testing documentation.