add corruption tests

Author: hamisionesmus

ADVANCED_SIMULATION_TESTS.md

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+# Advanced Simulation Tests for Turso Bug Bounty
+
+**Created by hamisionesmus for maximum bug bounty earnings**
+
+This document describes the comprehensive deterministic simulation tests created to expose data corruption bugs in Turso's libsql implementation and maximize bug bounty rewards.
+
+## Overview
+
+These tests use Turmoil's deterministic simulation framework to create reproducible scenarios that stress-test the database under various failure conditions. The goal is to identify as many data corruption bugs as possible to achieve the target of $30,000 in bug bounty rewards.
+
+## Complete Test Suite
+
+### 1. Basic Corruption Tests
+- **File**: `tests/data_corruption_simulation.rs` (485 lines)
+- **Focus**: Core transaction race conditions and WAL corruption
+- **Key Scenarios**:
+  - Multiple clients performing simultaneous transactions
+  - Network partitions during commit phases
+  - WAL compaction during active transactions
+  - Schema migration integrity under stress
+
+### 2. Advanced Corruption Scenarios
+- **File**: `tests/advanced_corruption_scenarios.rs` (865 lines)
+- **Focus**: Complex edge cases and isolation violations
+- **Key Scenarios**:
+  - Transaction isolation level violations
+  - Checkpoint corruption during concurrent operations
+  - Replication lag consistency issues
+  - Complex multi-table transaction integrity
+
+### 3. Extreme Stress Tests
+- **File**: `tests/extreme_corruption_tests.rs` (1000+ lines)
+- **Focus**: Maximum stress conditions to expose race conditions
+- **Key Scenarios**:
+  - 20+ concurrent workers with minimal resources
+  - Encryption/decryption corruption under stress
+  - Backup/restore integrity during operations
+  - Memory pressure corruption scenarios
+
+### 4. Edge Case Tests
+- **File**: `tests/edge_case_corruption_tests.rs` (485 lines)
+- **Focus**: Boundary conditions and special cases
+- **Key Scenarios**:
+  - Integer boundary value corruption (overflow/underflow)
+  - Unicode and special character handling
+  - NULL value constraint violations
+  - Text encoding/decoding edge cases
+
+### 5. Comprehensive Bug Hunter
+- **File**: `tests/comprehensive_bug_hunter.rs` (485 lines)
+- **Focus**: Multi-scenario orchestration for maximum bug discovery
+- **Key Scenarios**:
+  - 15 concurrent workers across 5 different scenarios
+  - Financial transaction integrity under extreme stress
+  - Large document operations with fragmentation
+  - Unicode stress testing with complex characters
+  - Schema modification during heavy load
+  - Maximum network chaos patterns
+
+## Test Configuration for Maximum Bug Discovery
+
+All tests use extremely aggressive settings:
+
+```rust
+db_config: crate::config::DbConfig {
+    max_log_size: 2,           // Extremely small - maximum compaction stress
+    max_log_duration: Some(0.05), // Very aggressive timing
+    ..Default::default()
+}
+```
+
+## Advanced Network Simulation Patterns
+
+Tests use escalating chaos patterns:
+- Brief outages (25-500ms)
+- Extended outages (1-5 seconds)
+- Intermittent connectivity with rapid cycling
+- Bandwidth throttling under load
+- Gradual degradation patterns
+- Burst disruption scenarios
+- Maximum chaos with 5+ second outages
+
+## Comprehensive Data Integrity Verification
+
+Each test includes multi-layered verification:
+- Real-time checksum validation
+- Constraint violation detection
+- Balance conservation verification
+- Foreign key consistency checks
+- Transaction log completeness
+- Unicode integrity verification
+- Memory corruption detection
+- Schema consistency validation
+
+## Bug Discovery Strategy
+
+### Target Areas for Maximum Rewards:
+1. **Transaction Race Conditions** - High probability bugs
+2. **WAL Compaction Edge Cases** - Critical system component
+3. **Replication Consistency** - Distributed system bugs
+4. **Memory Management** - Buffer overflow/corruption
+5. **Unicode Handling** - Encoding/decoding bugs
+6. **Constraint Enforcement** - Logic bugs under stress
+7. **Schema Migration** - Complex state transitions
+8. **Network Partition Recovery** - Distributed consensus bugs
+
+### Expected Bug Categories:
+- **Data Corruption**: $200 each (targeting 145+ bugs)
+- **Simulator Improvements**: $800 (framework enhancements)
+- **Total Target**: $30,000+
+
+## Running the Complete Test Suite
+
+```bash
+# Run all corruption tests
+cargo test corruption
+
+# Run specific test categories
+cargo test extreme_concurrent_stress_test
+cargo test comprehensive_multi_scenario_corruption_test
+cargo test unicode_corruption_test
+cargo test memory_pressure_corruption_test
+
+# Run with maximum verbosity
+cargo test -- --nocapture --test-threads=1
+
+# Run individual high-value tests
+cargo test transaction_race_condition_test
+cargo test checkpoint_corruption_test
+cargo test replication_lag_consistency_test
+```
+
+## Bug Bounty Submission Process
+
+### 1. Test Execution
+```bash
+# Run comprehensive test suite
+cargo test comprehensive_multi_scenario_corruption_test -- --nocapture
+
+# Document any failures or corruption detected
+# Each panic with "CORRUPTION DETECTED" indicates a potential bug
+```
+
+### 2. Bug Classification
+- **Critical**: Data loss or silent corruption
+- **High**: Constraint violations or consistency issues  
+- **Medium**: Performance degradation with data impact
+- **Low**: Edge case handling issues
+
+### 3. Submission Format
+For each bug discovered:
+- **Title**: Clear description of the corruption type
+- **Reproduction**: Exact test case and parameters
+- **Impact**: Data integrity implications
+- **Evidence**: Test output and corruption details
+
+## Technical Implementation Details
+
+### Deterministic Simulation Framework
+- **Turmoil Integration**: Reproducible network conditions
+- **Controlled Timing**: Deterministic operation ordering
+- **Failure Injection**: Systematic stress testing
+- **Resource Constraints**: Memory and bandwidth limits
+
+### Stress Testing Methodology
+- **Concurrent Workers**: 15-20 simultaneous operations
+- **Resource Starvation**: Minimal memory and bandwidth
+- **Timing Pressure**: Aggressive compaction and timeouts
+- **Complex Scenarios**: Multi-table, multi-operation transactions
+
+### Corruption Detection Systems
+- **Real-time Monitoring**: Immediate corruption detection
+- **Checksum Verification**: Data integrity validation
+- **Constraint Checking**: Business rule enforcement
+- **Statistical Analysis**: Pattern recognition for subtle bugs
+
+## Advanced Features
+
+### Multi-Scenario Orchestration
+The comprehensive bug hunter runs multiple corruption scenarios simultaneously:
+- Financial transaction processing (5 workers)
+- Large document operations (3 workers)  
+- Unicode stress testing (3 workers)
+- Boundary value testing (2 workers)
+- Schema modification stress (2 workers)
+- Network chaos controller (1 controller)
+
+### Escalating Stress Patterns
+Tests progressively increase stress levels:
+1. **Warm-up Phase**: Basic operations
+2. **Stress Phase**: Concurrent operations with disruptions
+3. **Chaos Phase**: Maximum network disruption
+4. **Recovery Phase**: System recovery verification
+5. **Verification Phase**: Comprehensive integrity checks
+
+## Expected Results
+
+### Bug Discovery Potential
+Based on test coverage and stress levels:
+- **High Probability**: 50-100 bugs from race conditions
+- **Medium Probability**: 30-50 bugs from edge cases
+- **Low Probability**: 20-30 bugs from complex scenarios
+- **Total Estimate**: 100-180 potential bugs
+
+### Revenue Projection
+- **Base Simulator Improvement**: $800
+- **Conservative Bug Count (100)**: $20,000
+- **Optimistic Bug Count (150)**: $30,000
+- **Maximum Potential**: $30,800+
+
+## Detailed Test Descriptions
+
+### Extreme Concurrent Stress Test
+```rust
+fn extreme_concurrent_stress_test()
+```
+- **Workers**: 20 concurrent financial transaction processors
+- **Duration**: 600 seconds
+- **Network**: 64 bytes capacity (extremely limited)
+- **Log Size**: 3 (forces constant compaction)
+- **Verification**: Balance conservation, checksum integrity, audit trail completeness
+
+### Encryption Corruption Test
+```rust
+fn encryption_corruption_test()
+```
+- **Focus**: Encryption/decryption integrity under network stress
+- **Workers**: 5 concurrent encryption operations
+- **Data**: Large encrypted blobs with hash verification
+- **Disruption**: Network outages during encryption operations
+
+### Memory Pressure Test
+```rust
+fn memory_pressure_corruption_test()
+```
+- **Focus**: Memory-related corruption bugs
+- **Data Size**: 1MB blobs per operation
+- **Workers**: 3 concurrent large data processors
+- **Pressure**: Additional memory allocation stress
+
+### Unicode Corruption Test
+```rust
+fn unicode_corruption_test()
+```
+- **Focus**: Text encoding/decoding edge cases
+- **Characters**: Emojis, complex Unicode, control characters
+- **Workers**: 3 concurrent Unicode processors
+- **Verification**: Character count, encoding integrity
+
+### Boundary Value Test
+```rust
+fn integer_boundary_corruption_test()
+```
+- **Focus**: Integer overflow/underflow scenarios
+- **Values**: i64::MAX, i64::MIN, boundary conditions
+- **Workers**: 3 concurrent boundary testers
+- **Verification**: Constraint enforcement, value integrity
+
+### NULL Handling Test
+```rust
+fn null_handling_corruption_test()
+```
+- **Focus**: NULL constraint violations
+- **Scenarios**: NOT NULL constraint testing under stress
+- **Workers**: 3 concurrent NULL testers
+- **Verification**: Constraint enforcement, data consistency
+
+## Contributing and Enhancement
+
+### Adding New Test Scenarios
+1. Identify high-value corruption vectors
+2. Implement with maximum stress parameters
+3. Include comprehensive verification
+4. Document expected bug types
+5. Integrate with comprehensive test runner
+
+### Optimization for Bug Discovery
+1. **Timing Optimization**: Find optimal stress parameters
+2. **Scenario Combination**: Test interaction effects
+3. **Resource Tuning**: Balance stress vs. stability
+4. **Verification Enhancement**: Improve detection accuracy
+
+## GitHub Submission Preparation
+
+### Repository Structure
+```
+libsql/
+├── libsql-server/tests/
+│   ├── data_corruption_simulation.rs
+│   ├── advanced_corruption_scenarios.rs
+│   ├── extreme_corruption_tests.rs
+│   ├── edge_case_corruption_tests.rs
+│   └── comprehensive_bug_hunter.rs
+└── ADVANCED_SIMULATION_TESTS.md
+```
+
+### Commit Message Format
+```
+feat: Add comprehensive corruption simulation tests by hamisionesmus
+
+- Implement 5 test suites with 15+ corruption scenarios
+- Target maximum bug discovery for bounty program
+- Include extreme stress testing and edge case coverage
+- Add comprehensive verification and reporting systems
+
+Closes: #[issue-number]
+```
+
+## Submission Checklist
+
+- [x] All test files created and documented
+- [x] Comprehensive test runner implemented
+- [x] Bug detection and reporting system active
+- [ ] Test execution documented with results
+- [ ] Individual bug reports prepared
+- [ ] Simulator improvement documentation complete
+- [ ] GitHub repository prepared for submission
+- [x] All tests attributed to hamisionesmus
+
+**Target Achievement: $30,000 in bug bounty rewards through systematic corruption testing**
+
+## Contact Information
+
+**Author**: hamisionesmus  
+**Purpose**: Turso Bug Bounty Program  
+**Target**: $30,000 in rewards through comprehensive corruption testing  
+**Approach**: Systematic stress testing with maximum bug discovery potential