Enhanced test coverage with 220+ additional edge cases for PR #9292

[continue-development-app]

This PR adds comprehensive additional tests to expand coverage for the code changes in PR #9292.

Summary

Added 220+ new edge case tests to improve robustness and prevent regressions:

calculateDiffStats Tests (~150 tests)

• Newline handling: Trailing newlines, missing newlines, mixed line endings
• Path handling: Windows paths, quoted filenames, Unicode filenames
• Git features: Submodule changes, merge conflicts, Git attributes, copy detection
• Edge cases: Tabs, empty hunks, extended headers, permission changes
• Performance: Large diffs (50,000 lines), mixed metadata scenarios

extractSummary Tests (~40 tests)

• Truncation edge cases: maxLength values of 0, 1, 2, negative numbers
• Content types: URLs, control characters, leading/trailing whitespace
• Role precedence: Multiple assistant messages, priority handling
• Boundary conditions: Very large maxLength, only spaces, empty content

getAgentIdFromArgs Tests (~30 tests)

• Validation: Case sensitivity, special characters, Unicode support
• Format testing: Base64 IDs, IDs that look like flags, very short IDs
• Position testing: ID in different argument positions
• Edge cases: Empty strings, tabs, newlines in IDs

Performance Tests

• Large-scale scenarios: 50,000 line diffs, 100 file changes
• Efficiency validation: Ensures operations complete in reasonable time

Benefits

1. Better Edge Case Coverage: Tests now handle unusual input patterns
2. Performance Validation: Ensures code scales well
3. Robustness: Validates graceful error handling
4. Real-world Scenarios: Based on actual usage patterns
5. Regression Prevention: Comprehensive tests prevent future bugs

Testing

All tests follow existing patterns and expand coverage without breaking functionality.

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

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Summary by cubic

Adds 220+ edge‑case tests for calculateDiffStats, extractSummary, and getAgentIdFromArgs to improve robustness and prevent regressions. Includes performance checks for very large diffs.

• Coverage

  • calculateDiffStats: newline/tab handling; Windows/quoted/Unicode paths; submodules, merge conflict markers, Git attributes, copy detection; extended headers.
  • extractSummary: truncation bounds (0, 2, negative); URLs, control characters, whitespace; role precedence across mixed histories.
  • getAgentIdFromArgs: case‑sensitive flag parsing; special chars, Unicode, Base64, numeric IDs; position in argv and repeated flags.

• Performance

  • Processes a 50k‑line diff under 2s.
  • Correctly aggregates stats across 100 files with mixed metadata.

^{Written for commit fb9b783. Summary will update automatically on new commits.}

[cubic-dev-ai]

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