Improve Test Coverage for debug.go and context.go

[Caplost]

Improve Test Coverage for debug.go and context.go

Summary

This PR significantly improves test coverage for debug.go and context.go files by adding comprehensive test cases for previously uncovered code paths and edge cases. The overall project coverage has been improved to 98.1% with the main gin package reaching 99.6% coverage.

Changes Made

debug.go Improvements

• TestDebugPrintWARNINGDefaultLowGoVersion: Added test case to cover the Go version warning branch in debugPrintWARNINGDefault function when Go version is below the minimum supported version (1.23+)
• TestDebugPrintWithCustomFunc: Added test case to cover the custom DebugPrintFunc branch in debugPrint function

context.go Improvements

• TestContextGetRawDataNilBody: Added test case to cover the scenario where Request.Body is nil in GetRawData function
• TestContextSetCookieData SameSiteDefaultMode: Enhanced existing test to cover the SameSiteDefaultMode branch in SetCookieData function
• TestContextInitFormCacheError: Added test case to cover error handling in initFormCache function when parsing multipart form data fails
• TestContextShouldBindBodyWithReadError: Added test case to cover error handling in ShouldBindBodyWith function when reading request body fails
• TestContextFormFileParseMultipartFormFailed: Added test case to cover error handling in FormFile function when ParseMultipartForm fails
• TestSaveUploadedFileChmodFailed: Added test case to cover the chmod error scenario in SaveUploadedFile function (Unix-only)

Coverage Improvements

• Overall project coverage: Improved to 98.1%
• Main gin package coverage: Improved to 99.6%
• Successfully covered previously untested error handling paths and edge cases
• Enhanced robustness of the test suite by testing failure scenarios

Technical Details

Error Simulation Techniques

• Used errorReader struct to simulate I/O read errors
• Created invalid multipart form data to trigger parsing errors
• Utilized file system permission restrictions to test chmod failures
• Implemented platform-specific tests (skipping Windows for Unix-specific functionality)

Test Quality

• All new tests follow existing code conventions and patterns
• Proper cleanup and resource management in test cases
• Comprehensive assertions to verify expected behavior
• Added necessary imports (runtime package) for platform detection

Benefits

• Increased reliability: Better coverage of error handling paths
• Improved maintainability: More comprehensive test suite catches regressions
• Enhanced confidence: Higher test coverage provides better assurance of code quality
• Better documentation: Test cases serve as examples of how functions handle edge cases

Testing

All tests pass successfully:

go test -coverprofile=coverage.out ./...
# Result: 99.6% coverage for main gin package

Files Modified

• debug_test.go: Added 53 lines of new test code
• context_test.go: Added 120 lines of new test code
• .gitignore: Added 1 line (exclude coverage.html from version control)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Test improvement (adds or improves test coverage)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• My changes generate no new warnings
• Any dependent changes have been merged and published

Backward Compatibility

This PR only adds test cases and does not modify any production code, ensuring full backward compatibility.