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Test Coverage Analysis for BPlusTree3

Currently Running in CI (Fast Tests - ~225 tests)

Core Functionality ✅

  • test_bplus_tree.py - Core B+ tree operations, splits, merges, invariants
  • test_dictionary_api.py - Dict-like interface (get, set, del, etc.)
  • test_iterator.py - Iteration and range queries
  • test_invariant_bug.py - Tree structure invariants
  • test_proper_deletion.py - Deletion edge cases
  • test_single_child_parent.py - Tree structure edge cases
  • test_stress_edge_cases.py - Boundary conditions
  • test_max_occupancy_bug.py - Capacity edge cases

Import & Compatibility ✅

  • test_import_error_fallback.py - C extension fallback
  • test_optimized_bplus_tree.py - Optimization paths
  • test_single_array_int_optimization.py - Performance optimizations

Bug Regression ✅

  • test_fuzz_discovered_patterns.py - Patterns found by fuzzing
  • Various specific bug test files

Currently SKIPPED but should be reliability-critical

Performance & Scale (SKIPPED as "slow") ⚠️

  • test_memory_leaks.py - Memory leak detection (CRITICAL for production)
  • test_performance_benchmarks.py - Performance regression detection
  • test_stress_large_datasets.py - Large scale behavior
  • test_performance_regression.py - Performance monitoring

C Extension Tests (SKIPPED - no C ext) ⚠️

  • test_c_extension*.py - C extension functionality
  • test_data_alignment.py - Memory alignment
  • test_gc_support.py - Garbage collection support
  • test_no_segfaults.py - Crash prevention
  • test_segfault_regression.py - Segfault prevention

Reliability Assessment

What we're testing well ✅

  • Correctness: Core B+ tree algorithms and data structures
  • API compatibility: Dictionary interface works correctly
  • Edge cases: Boundary conditions and known bug patterns
  • Basic functionality: Insert, delete, search, iterate

Critical gaps for production reliability ⚠️

  • Memory leaks: Not tested in CI (could cause production crashes)
  • Performance regressions: Not caught early (could cause user issues)
  • Scale behavior: Unknown how it behaves with large datasets
  • Resource exhaustion: Memory/CPU limits not tested