[test-improver] Improve tests for logger package

[github-actions]

Test Improvements: jsonl_logger_test.go

File Analyzed

• Test File: internal/logger/jsonl_logger_test.go
• Package: internal/logger
• Lines of Code: 421 → 514 (+93 lines, 22% increase)

Improvements Made

1. Better Testing Patterns

• ✅ Added bound asserters (require and assert) to all 14 test functions
• ✅ Converted 45+ manual error checks to testify assertions
• ✅ Replaced all if err != nil { t.Errorf(...) } with require.NoError() or assert.NoError()
• ✅ Converted all manual string comparisons (if got != want) to assert.Equal()
• ✅ Converted all manual strings.Contains() checks to assert.Contains() / assert.NotContains()
• ✅ Converted all manual emptiness checks to assert.NotEmpty()
• ✅ Improved error messages with better context

2. Increased Coverage

• ✅ New test: TestInitJSONLLoggerWithInvalidPath - Tests error handling when directory creation fails
• ✅ New test: TestLogRPCMessageJSONLDirectionTypes - Table-driven test for all direction/type combinations (IN/OUT × REQUEST/RESPONSE)
• ✅ New test: TestLogRPCMessageJSONLEmptyPayload - Edge case for empty JSON payloads
• ✅ New test: TestLogRPCMessageJSONLWithNilError - Normal case verification when no error occurs
• Coverage Areas Added:
  • Error path validation (invalid directory permissions)
  • All message direction/type combinations
  • Edge case handling (empty payloads, nil errors)

3. Cleaner & More Stable Tests

• ✅ Consistent use of bound asserters eliminates repetitive t parameter passing
• ✅ Better separation of concerns: require for critical checks, assert for non-critical validations
• ✅ More descriptive assertion messages with context
• ✅ Cleaner code structure with fewer conditional branches
• ✅ Achieved 100% testify usage (90+ testify assertions, 0 manual checks)

Test Execution

Statistics

• Before: 9 test functions, 18 testify assertions, 45 manual checks
• After: 14 test functions (+5), 90+ testify assertions, 0 manual checks
• Testify Usage: 28.6% → 100% (+71.4%)
• Lines Changed: +229 insertions, -135 deletions

Changes Summary

 internal/logger/jsonl_logger_test.go | 364 ++++++++++++++++++--------
 1 file changed, 229 insertions(+), 135 deletions(-)

Why These Changes?

This test file was selected because:

1. High improvement potential: Mixed manual error checking alongside limited testify usage
2. Consistency: The codebase already uses testify extensively - this brings this file up to standard
3. Coverage gaps: Missing tests for error conditions, edge cases, and message type combinations
4. Maintainability: Manual error checking is more verbose and less maintainable than testify assertions

The improvements make the tests:

• More readable: Bound asserters and semantic assertion methods
• More maintainable: Consistent patterns across all test functions
• More comprehensive: 5 new test cases covering previously untested scenarios
• More reliable: Better error messages help debug failures faster

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