docs: Add session notes for 2025-11-04 grammar checker test suite

Documented comprehensive test suite implementation:
- 15 tests covering LanguageTool integration (6 unit + 9 integration)
- Test fixtures with known grammar errors
- Applied quality-engineer.org testing philosophy
- All tests passing and integrated with Makefile

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

1 files changed, 66 insertions, 0 deletions

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 ** 🚀 Current Session Notes
 
+*** 2025-11-04 Session 3 - LanguageTool Grammar Checker Test Suite
+*Time:* ~1 hour
+*Status:* ✅ COMPLETE - Comprehensive test suite with 15 passing tests
+
+*What We Completed:*
+
+1. ✅ **Created Test Fixtures** (tests/fixtures/)
+   - grammar-errors-basic.txt - Common grammar errors (subject-verb, could of, etc.)
+   - grammar-errors-punctuation.txt - Punctuation and spacing issues
+   - grammar-correct.txt - Clean baseline for comparison
+   - Deterministic fixtures for reliable testing
+
+2. ✅ **Unit Tests** (test-flycheck-languagetool-setup.el)
+   - 6 tests verifying LanguageTool installation and setup
+   - Checks binary availability, wrapper script existence
+   - Validates wrapper script structure (shebang, imports)
+   - Tests error handling for missing arguments
+   - All tests pass ✓ (< 1 second)
+
+3. ✅ **Integration Tests** (test-integration-grammar-checking.el)
+   - 9 tests covering end-to-end grammar checking workflow
+   - Tests wrapper script with real LanguageTool execution
+   - Validates flycheck-compatible output format
+   - Normal cases: error detection, output formatting
+   - Boundary cases: empty files, single word, multiple paragraphs
+   - Error cases: nonexistent files, missing arguments
+   - All tests pass ✓ (~35 seconds with real LanguageTool execution)
+
+4. ✅ **Applied Testing Philosophy** from quality-engineer.org
+   - Focus on OUR code (wrapper script), not flycheck internals
+   - Trust external frameworks work correctly
+   - Test real integration with actual LanguageTool execution
+   - Comprehensive docstrings listing integrated components
+   - Clear test categories: Normal, Boundary, Error cases
+   - No over-mocking of domain logic
+
+*Key Decisions:*
+- Don't test flycheck framework internals (trust it works)
+- Test our integration code with real external tools
+- Use real fixtures instead of generated test data
+- Integration tests run slower but provide high confidence
+
+*Files Created:*
+- tests/test-flycheck-languagetool-setup.el
+- tests/test-integration-grammar-checking.el
+- tests/fixtures/grammar-errors-basic.txt
+- tests/fixtures/grammar-errors-punctuation.txt
+- tests/fixtures/grammar-correct.txt
+
+*Makefile Integration:*
+Tests automatically discovered via wildcards:
+- make test-unit (includes our unit test)
+- make test-integration (includes our integration test)
+- make test-file FILE=test-flycheck-languagetool-setup.el
+- make test-file FILE=test-integration-grammar-checking.el
+
+*Test Results:*
+- Unit tests: 6/6 passing
+- Integration tests: 9/9 passing
+- Total: 15/15 tests ✓
+
+*Status:*
+- All code committed and pushed to origin + github ✅
+- Tests run regularly via Makefile ✅
+- Grammar checker fully tested and production-ready ✅
+
 *** 2025-11-04 Session 2 - Emergency Bug Fixes & Modeline Polish
 *Time:* ~30 minutes
 *Status:* ✅ COMPLETE - Fixed async buffer error and improved modeline spacing