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TESTING SUMMARY FOR -o OPTION IMPLEMENTATION
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QUICK START
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Run: make test
Or:  ./tests/test_o_option.sh

RESULTS
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✓ 33/33 tests passing (100%)

TEST CATEGORIES
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1. Basic IPv4 matching (3 tests)
2. Narrowest match selection (4 tests)
3. Batch processing (1 test)
4. IPv6 support (4 tests)
5. Mixed IPv4/IPv6 (1 test)
6. Input methods (1 test)
7. Backward compatibility (2 tests)
8. Edge cases (4 tests)
9. Complex scenarios (2 tests)
10. Pattern ordering (1 test)
11. Newline handling (1 test)
12. Count mode compatibility (1 test)
13. Real-world AWS use case (1 test)
14. Performance with large pattern sets (1 test)
15. IPv4-mapped IPv6 (1 test)
16. AWS tab-delimited format (5 tests)

KEY FEATURES TESTED
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✓ Pattern output instead of IP input
✓ Narrowest match from overlapping ranges
✓ IPv4 and IPv6 pattern matching
✓ Pattern file with comments
✓ stdin and file input methods
✓ Count mode (-c) compatibility
✓ Works correctly with 100+ patterns
✓ Normal mode still works without -o
✓ AWS tab-delimited format with service names

DOCUMENTATION
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TEST_O_OPTION.md         - Detailed testing guide
AWS_TEST_VALIDATION.md   - AWS use case validation
tests/README.md          - Test suite organization
