edge-case-coveragelisted

# Edge Case Coverage Systematically identify and handle boundary conditions. ## Decision Tree: Which Edge Case Category? ``` What kind of edge case are you looking for? ├─ Input validation? → Check null, wrong type, empty, overflow, malformed ├─ Boundary values? → Check 0, 1, min, max, just-above, just-below ├─ State transitions? → Check uninitialized, concurrent, stale, partial ├─ Resource limits? → Check timeout, OOM, disk full, connection pool exhaustion ├─ Network failures? → Check offline, slow, partial failure, retry exhaustion ├─ Permission issues? → Check unauthorized, expired, revoked, insufficient scope └─ Multi-system interaction? → Check race conditions, ordering, idempotency ``` ## Edge Case Categories | Category | Examples | Detection Heuristic | |----------|----------|---------------------| | Boundary | 0, 1, max, min, empty | Any numeric or size parameter | | Input | null, undefined, wrong type | Any external-facing function | | State | uninitialized, concurrent, stale | Any stateful operation | | Resource | timeout, no memory, disk full | Any I/O or long-running operation | | Network | offline, slow, partial failure | Any remote call | | Permission | unauthorized, expired, revoked | Any auth-gated operation | ## Boundary Analysis ### Numeric Boundaries ``` Value: age ├── Below min: -1 ├── At min: 0 ├── Just above min: 1 ├── Normal: 25 ├── Just below max: 119 ├── At max: 120 └── Above max: 121 ``` ### String Boundaries ``` Value: username ├── Empty: ""