test: increase code coverage to 100%

[shenxianpeng]

Summary

Increases test coverage from 66% to 100% by adding comprehensive tests for all code paths in commit_check_mcp.server.

Changes

New test coverage for:

• _normalize_config — non-dict input raises ValueError
• _normalize_repo_path — non-string, empty, non-existent, file-path inputs
• _normalize_config_path — non-string, empty, non-existent, non-file inputs
• _working_directory — actual chdir/restore behavior with a real path
• _validate_message — real commit-check engine calls (passing and failing)
• _validate_branch — real engine call with branch name
• _validate_push — real engine enforcement of no_force_push rule
• _validate_author — all branches: both name+email, only name, only email, neither
• _validate_all — all combinations: message, branch, author name, author email
• All MCP tool error paths — empty/non-string inputs raise proper errors
• validate_repository_state — all flag combinations, overall fail status
• describe_validation_rules — config override merging
• server_health — returns all expected keys
• main() — entry point invokes mcp.run(transport="stdio")

Retained existing tests

All original tests are preserved (and improved where needed), including:

• Push safety rule enforcement with mocked _run_checks
• Config merging with repo defaults
• Config path resolution relative to repo
• Repository state with combined checks

Details

• 65 tests total (up from 11)
• 100% statement coverage on server.py and __init__.py
• No source code changes — only test file additions
• All tests pass cleanly

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7fcddd2e-d1cf-44c4-9ac7-ef31e02ec486

📥 Commits

Reviewing files that changed from the base of the PR and between aede8c3 and 547e4a3.

📒 Files selected for processing (1)

• tests/test_server.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/100-percent-test-coverage

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (aede8c3) to head (547e4a3).

Additional details and impacted files

@@             Coverage Diff              @@
##             main       #14       +/-   ##
============================================
+ Coverage   66.02%   100.00%   +33.97%     
============================================
  Files           2         2               
  Lines         209       209               
============================================
+ Hits          138       209       +71     
+ Misses         71         0       -71     

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