Tests added, see the documentation in the tests directory for details. Improved the socket code.

tests/PRE_COMMIT_INTEGRATION.md

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+# Pre-Commit Test Integration
+
+## Overview
+
+The test suite is now automatically executed as part of the pre-commit hook, ensuring all commits maintain code quality and passing tests.
+
+## What Happens on Commit
+
+When you run `git commit`, the pre-commit hook now performs **5 validation steps**:
+
+```
+1. Python syntax validation (all files)
+2. Common issue detection (modified files)
+3. Core module import testing
+4. Test suite execution (37 tests) ← NEW!
+5. Secret/credential detection
+```
+
+## Test Execution
+
+```bash
+4. Running test suite...
+============================= test session starts ==============================
+platform linux -- Python 3.13.7, pytest-8.4.2, pluggy-1.6.0
+rootdir: /home/storm/git/fenrir
+configfile: pytest.ini
+collected 37 items
+
+tests/integration/test_remote_control.py ....................            [ 54%]
+tests/unit/test_settings_validation.py .................                 [100%]
+
+============================== 37 passed in 0.44s ==============================
+✓ All tests passed
+```
+
+**Performance:** Tests complete in **< 1 second**, adding minimal overhead to the commit process.
+
+## Behavior
+
+### ✅ Tests Pass - Commit Allowed
+```bash
+$ git commit -m "Add new feature"
+
+Fenrir Pre-commit Validation
+==================================
+1. Validating Python syntax...
+✓ Syntax validation passed
+
+2. Checking modified files...
+✓ No common issues found
+
+3. Testing core module imports...
+✓ Core module imports successful
+
+4. Running test suite...
+✓ All tests passed (37 passed in 0.44s)
+
+5. Checking for potential secrets...
+✓ No potential secrets found
+
+==================================================
+✓ All pre-commit validations passed
+Commit allowed to proceed
+```
+
+### ❌ Tests Fail - Commit Blocked
+```bash
+$ git commit -m "Broken feature"
+
+Fenrir Pre-commit Validation
+==================================
+[... earlier checks pass ...]
+
+4. Running test suite...
+✗ Test suite failed
+Run: pytest tests/ -v  (to see details)
+
+==================================================
+✗ Pre-commit validation failed
+Commit blocked - please fix issues above
+
+Quick fixes:
+  • Python syntax: python3 tools/validate_syntax.py --fix
+  • Run tests: pytest tests/ -v
+  • Review flagged files manually
+  • Re-run commit after fixes
+```
+
+## Installation
+
+The pre-commit hook is installed via:
+
+```bash
+# One-time setup
+./tools/install_validation_hook.sh
+
+# Or manually
+ln -sf ../../tools/pre-commit-hook .git/hooks/pre-commit
+```
+
+## Requirements
+
+### Required
+- Python 3.7+
+- Git repository
+
+### Optional but Recommended
+- `pytest` - For running tests (gracefully skipped if not installed)
+
+If pytest is not installed, you'll see:
+```
+4. Running test suite...
+⚠ pytest not installed - skipping tests
+  Install with: pip install pytest
+  Or full test suite: pip install -r tests/requirements.txt
+```
+
+The commit will still proceed, but tests won't run.
+
+## Benefits
+
+1. **Catch bugs early** - Tests run before code reaches the repository
+2. **Maintain quality** - Broken code can't be committed
+3. **Fast feedback** - Tests complete in < 1 second
+4. **Zero overhead** - Gracefully degrades if pytest isn't installed
+5. **Confidence** - Know that all commits pass tests
+
+## Bypassing the Hook
+
+**Not recommended**, but if you need to commit without running tests:
+
+```bash
+# Skip all pre-commit checks (use with caution!)
+git commit --no-verify -m "Emergency hotfix"
+```
+
+**Warning:** Only use `--no-verify` for legitimate emergencies. Bypassing tests defeats their purpose.
+
+## Troubleshooting
+
+### Tests fail on commit but pass manually
+
+```bash
+# Check environment matches
+cd /home/storm/git/fenrir
+pytest tests/ -v
+
+# Verify PYTHONPATH
+echo $PYTHONPATH
+```
+
+### Hook doesn't run tests
+
+```bash
+# Check pytest is installed
+pytest --version
+
+# Install if missing
+pip install pytest
+
+# Or full test dependencies
+pip install -r tests/requirements.txt
+```
+
+### Hook takes too long
+
+The test suite is designed to run in < 1 second. If it's slower:
+
+```bash
+# Check test timing
+pytest tests/ --durations=10
+
+# Look for slow tests (should all be < 100ms)
+```
+
+## Statistics
+
+- **Tests Executed:** 37
+- **Execution Time:** 0.44 seconds
+- **Pass Rate:** 100%
+- **Coverage:** Unit tests (17) + Integration tests (20)
+
+## Future Enhancements
+
+Possible additions to pre-commit validation:
+
+- **Coverage threshold** - Require minimum test coverage percentage
+- **Performance regression** - Warn if tests get slower
+- **Incremental testing** - Only run tests for modified code
+- **Parallel execution** - Use `pytest -n auto` (requires pytest-xdist)
+
+## Related Documentation
+
+- `tests/README.md` - Test strategy overview
+- `tests/TESTING_GUIDE.md` - Comprehensive testing guide
+- `TESTING_SUMMARY.md` - Test implementation summary
+- `tools/pre-commit-hook` - Pre-commit hook source code
+
+## Summary
+
+Adding tests to the pre-commit hook ensures:
+- ✅ All commits have passing tests
+- ✅ Regressions are caught immediately
+- ✅ Code quality is maintained
+- ✅ Minimal performance impact (< 1 second)
+- ✅ Graceful degradation without pytest
+
+**Result:** Higher code quality with virtually zero developer friction.