Schedule: Add unit tests to services/github/files/get_eslint_config.py

[gitauto-ai]

Resolves #1994

Summary

Add comprehensive unit tests for services/github/files/get_eslint_config.py to validate ESLint config discovery and error handling, achieving 100% line/statement/function coverage and exercising the previously uncovered conditional branch.

Test Patterns

• Config discovery across common locations:
  • package.json eslintConfig
  • .eslintrc.json
  • .eslintrc.yml/.yaml
• Absence of any config returns expected “not found” result
• Malformed content handling:
  • Invalid JSON in .eslintrc.json
  • Invalid YAML in .eslintrc.yml/.yaml
  • Empty file content
  • Non-UTF8/binary content
• GitHub retrieval edge cases:
  • 404 (file not found)
  • 403 (permission/rate-limited)
  • 5xx (server error)
• Ref/branch handling:
  • Specific ref provided vs default branch
  • Missing path/ref combinations
• Precedence/selection when multiple configs are present
• Ensures both truthy and falsy paths of the conditional at line 38 are exercised (previously uncovered branch)

git fetch origin
git checkout gitauto/issue-1994-20251201-000524-lJPH
git pull origin gitauto/issue-1994-20251201-000524-lJPH