asupersync 0.3.4

//! Conformance tests for lab/* deterministic runtime.
//!
//! This module implements [br-conformance-14] following Pattern 3 (Round-Trip
//! Conformance) and Pattern 4 (Spec-Derived Test Matrix) from the conformance
//! testing harness skill. Tests lab runtime for deterministic behavior,
//! scenario replayability, and snapshot/restore round-trip correctness.
//!
//! # Specification Sources
//!
//! - Lab Runtime Determinism: Chaos injection with deterministic RNG seeding
//! - Scenario Runner Replayability: Identical trace certificates on replay
//! - Snapshot/Restore Round-Trip: State preservation with quiescence proof
//! - FrankenLab Deterministic Testing: Virtual time, oracle filtering, seed exploration
//!
//! # Test Categories
//!
//! ## Chaos Determinism
//! - MUST: Same seed produces identical chaos injection sequences
//! - MUST: Chaos events maintain deterministic ordering across runs
//! - MUST: Cancellation chaos points are reproducible
//! - MUST: Delay chaos maintains temporal relationships
//! - SHOULD: Wakeup storm chaos preserves waker correctness
//!
//! ## Scenario Runner Replayability
//! - MUST: Scenarios execute identically on replay with same seed
//! - MUST: Trace certificates match exactly between runs
//! - MUST: Oracle reports maintain consistency across replay
//! - MUST: Fault injection timing remains deterministic
//! - SHOULD: Complex scenarios with multiple fault types replay correctly
//!
//! ## Snapshot/Restore Round-Trip
//! - MUST: Snapshot → restore preserves runtime state exactly
//! - MUST: Restored runtime reaches quiescence correctly
//! - MUST: Task/region/obligation relationships survive round-trip
//! - MUST: Logical timestamps maintain causal ordering after restore
//! - SHOULD: Large state snapshots round-trip without corruption

#![allow(dead_code)]

use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::time::Duration;

#[cfg(test)]
use proptest::prelude::*;

// ================================================================================================
// Conformance Test Framework
// ================================================================================================

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum RequirementLevel {
    Must,
    Should,
    May,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum TestCategory {
    ChaosDeterminism,
    ScenarioReplayability,
    SnapshotRestore,
    VirtualTime,
    OracleConsistency,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct ConformanceCase {
    pub id: &'static str,
    pub section: &'static str,
    pub level: RequirementLevel,
    pub category: TestCategory,
    pub description: &'static str,
}

#[derive(Debug, Serialize)]
pub enum TestResult {
    Pass,
    Fail { reason: String },
    Skipped { reason: String },
}

// ================================================================================================
// Deterministic Lab Runtime Model
// ================================================================================================

#[derive(Debug, Clone)]
pub struct MockLabRuntime {
    seed: u64,
    virtual_time: Duration,
    chaos_events: Vec<ChaosEvent>,
    scenario_state: ScenarioState,
    snapshot_data: Option<RuntimeSnapshot>,
    deterministic_rng: MockRng,
    oracle_reports: Vec<OracleReport>,
}

#[derive(Debug, Clone)]
pub struct ChaosEvent {
    pub event_type: ChaosEventType,
    pub target_task: u64,
    pub virtual_time: Duration,
    pub sequence: u64,
}

#[derive(Debug, Clone, PartialEq)]
pub enum ChaosEventType {
    Cancellation,
    Delay { duration: Duration },
    IoError { error_code: u32 },
    WakeupStorm { count: u32 },
    BudgetExhaustion,
}

#[derive(Debug, Clone)]
pub struct ScenarioState {
    pub scenario_id: String,
    pub execution_trace: Vec<TraceEvent>,
    pub fault_events: Vec<FaultEvent>,
    pub oracle_checks: HashMap<String, bool>,
    pub replay_count: u32,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RuntimeSnapshot {
    pub timestamp: Duration,
    pub task_states: HashMap<u64, TaskState>,
    pub region_tree: HashMap<u64, RegionState>,
    pub obligation_map: HashMap<u64, ObligationState>,
    pub logical_clocks: HashMap<u64, u64>,
    pub quiescence_proof: QuiescenceProof,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TaskState {
    pub task_id: u64,
    pub region_id: u64,
    pub status: TaskStatus,
    pub logical_time: u64,
    pub cancellation_token: Option<u64>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum TaskStatus {
    Scheduled,
    Running,
    Waiting,
    Completed,
    Cancelled,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RegionState {
    pub region_id: u64,
    pub parent_region: Option<u64>,
    pub child_tasks: Vec<u64>,
    pub child_regions: Vec<u64>,
    pub status: RegionStatus,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum RegionStatus {
    Active,
    Closing,
    Closed,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ObligationState {
    pub obligation_id: u64,
    pub task_id: u64,
    pub obligation_type: ObligationType,
    pub status: ObligationStatus,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ObligationType {
    Permit,
    Acknowledgment,
    Lease,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum ObligationStatus {
    Pending,
    Committed,
    Aborted,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QuiescenceProof {
    pub all_regions_closed: bool,
    pub no_pending_tasks: bool,
    pub all_obligations_resolved: bool,
    pub causal_ordering_valid: bool,
}

#[derive(Debug, Clone)]
pub struct TraceEvent {
    pub sequence: u64,
    pub task_id: u64,
    pub event_type: TraceEventType,
    pub logical_time: u64,
    pub virtual_time: Duration,
}

#[derive(Debug, Clone, PartialEq)]
pub enum TraceEventType {
    TaskSpawn,
    TaskComplete,
    TaskCancel,
    RegionCreate,
    RegionClose,
    ObligationCreate,
    ObligationResolve,
    ChaosInjection { chaos_type: ChaosEventType },
}

#[derive(Debug, Clone)]
pub struct FaultEvent {
    pub fault_id: String,
    pub timing: Duration,
    pub fault_type: String,
    pub target: String,
}

#[derive(Debug, Clone)]
pub struct OracleReport {
    pub oracle_name: String,
    pub checks_passed: u32,
    pub checks_failed: u32,
    pub violations: Vec<String>,
}

#[derive(Debug, Clone)]
pub struct MockRng {
    seed: u64,
    state: u64,
}

impl MockRng {
    pub fn new(seed: u64) -> Self {
        Self { seed, state: seed }
    }

    pub fn next(&mut self) -> u64 {
        // Simple LCG for deterministic pseudo-random generation
        self.state = self.state.wrapping_mul(1103515245).wrapping_add(12345);
        self.state
    }

    pub fn next_f64(&mut self) -> f64 {
        (self.next() as f64) / (u64::MAX as f64)
    }

    pub fn next_bool(&mut self, probability: f64) -> bool {
        self.next_f64() < probability
    }
}

impl MockLabRuntime {
    pub fn new(seed: u64) -> Self {
        Self {
            seed,
            virtual_time: Duration::ZERO,
            chaos_events: Vec::new(),
            scenario_state: ScenarioState {
                scenario_id: "default".to_string(),
                execution_trace: Vec::new(),
                fault_events: Vec::new(),
                oracle_checks: HashMap::new(),
                replay_count: 0,
            },
            snapshot_data: None,
            deterministic_rng: MockRng::new(seed),
            oracle_reports: Vec::new(),
        }
    }

    // =============================================================================================
    // Chaos Determinism Implementation
    // =============================================================================================

    pub fn inject_chaos_with_seed(&mut self, chaos_config: &ChaosConfig) -> Vec<ChaosEvent> {
        let mut rng = MockRng::new(self.seed);
        let mut events = Vec::new();
        let mut sequence = 0;

        for _ in 0..chaos_config.max_events {
            if rng.next_bool(chaos_config.injection_probability) {
                let event_type = match rng.next() % 5 {
                    0 => ChaosEventType::Cancellation,
                    1 => ChaosEventType::Delay {
                        duration: Duration::from_millis(rng.next() % 100),
                    },
                    2 => ChaosEventType::IoError {
                        error_code: (rng.next() % 10) as u32,
                    },
                    3 => ChaosEventType::WakeupStorm {
                        count: (rng.next() % 20) as u32 + 1,
                    },
                    _ => ChaosEventType::BudgetExhaustion,
                };

                let event = ChaosEvent {
                    event_type,
                    target_task: rng.next() % 100,
                    virtual_time: self.virtual_time,
                    sequence,
                };

                events.push(event.clone());
                sequence += 1;
            }
        }

        self.chaos_events.extend(events.clone());
        events
    }

    pub fn verify_chaos_determinism(&self, other: &Self) -> bool {
        if self.seed != other.seed {
            return false;
        }

        if self.chaos_events.len() != other.chaos_events.len() {
            return false;
        }

        for (a, b) in self.chaos_events.iter().zip(other.chaos_events.iter()) {
            if a.event_type != b.event_type
                || a.target_task != b.target_task
                || a.sequence != b.sequence
            {
                return false;
            }
        }

        true
    }

    // =============================================================================================
    // Scenario Runner Replayability Implementation
    // =============================================================================================

    pub fn run_scenario(&mut self, scenario: &TestScenario) -> ScenarioResult {
        self.scenario_state.scenario_id = scenario.id.clone();
        self.scenario_state.fault_events = scenario.fault_events.clone();
        self.scenario_state.replay_count += 1;

        let mut trace_events = Vec::new();
        let mut oracle_checks = HashMap::new();
        let mut rng = MockRng::new(self.seed);

        // Execute scenario steps with deterministic behavior.
        for (i, fault) in scenario.fault_events.iter().enumerate() {
            let trace_event = TraceEvent {
                sequence: i as u64,
                task_id: rng.next() % 10,
                event_type: match fault.fault_type.as_str() {
                    "cancel" => TraceEventType::TaskCancel,
                    "delay" => TraceEventType::ChaosInjection {
                        chaos_type: ChaosEventType::Delay {
                            duration: fault.timing,
                        },
                    },
                    _ => TraceEventType::TaskSpawn,
                },
                logical_time: i as u64 * 1000,
                virtual_time: fault.timing,
            };
            trace_events.push(trace_event);

            // Execute oracle checks.
            oracle_checks.insert(format!("oracle_{}", i), rng.next_bool(0.9));
        }

        self.scenario_state.execution_trace = trace_events.clone();
        self.scenario_state.oracle_checks = oracle_checks.clone();

        ScenarioResult {
            scenario_id: scenario.id.clone(),
            execution_trace: trace_events,
            oracle_checks,
            replay_count: self.scenario_state.replay_count,
            trace_certificate: self.generate_trace_certificate(),
        }
    }

    pub fn generate_trace_certificate(&self) -> String {
        use std::collections::hash_map::DefaultHasher;
        use std::hash::{Hash, Hasher};

        let mut hasher = DefaultHasher::new();

        // Hash the execution trace in a deterministic way
        for event in &self.scenario_state.execution_trace {
            event.sequence.hash(&mut hasher);
            event.task_id.hash(&mut hasher);
            event.logical_time.hash(&mut hasher);
            // Hash event type
            match &event.event_type {
                TraceEventType::TaskSpawn => 0u8.hash(&mut hasher),
                TraceEventType::TaskComplete => 1u8.hash(&mut hasher),
                TraceEventType::TaskCancel => 2u8.hash(&mut hasher),
                TraceEventType::RegionCreate => 3u8.hash(&mut hasher),
                TraceEventType::RegionClose => 4u8.hash(&mut hasher),
                TraceEventType::ObligationCreate => 5u8.hash(&mut hasher),
                TraceEventType::ObligationResolve => 6u8.hash(&mut hasher),
                TraceEventType::ChaosInjection { .. } => 7u8.hash(&mut hasher),
            }
        }

        // Hash oracle results in key order so replay certificates do not depend on HashMap iteration.
        let mut oracle_checks: Vec<_> = self.scenario_state.oracle_checks.iter().collect();
        oracle_checks.sort_by(|(left, _), (right, _)| left.cmp(right));
        for (key, value) in oracle_checks {
            key.hash(&mut hasher);
            value.hash(&mut hasher);
        }

        format!("trace_cert_{:016x}", hasher.finish())
    }

    // =============================================================================================
    // Snapshot/Restore Round-Trip Implementation
    // =============================================================================================

    pub fn take_snapshot(&self) -> RuntimeSnapshot {
        RuntimeSnapshot {
            timestamp: self.virtual_time,
            task_states: self.generate_sample_task_states(),
            region_tree: self.generate_sample_region_tree(),
            obligation_map: self.generate_sample_obligations(),
            logical_clocks: self.generate_logical_clocks(),
            quiescence_proof: self.validate_quiescence(),
        }
    }

    pub fn restore_from_snapshot(&mut self, snapshot: RuntimeSnapshot) -> Result<(), String> {
        // Validate snapshot structural integrity
        if !self.validate_snapshot_integrity(&snapshot) {
            return Err("Snapshot integrity validation failed".to_string());
        }

        // Restore state from snapshot
        self.virtual_time = snapshot.timestamp;

        // Validate quiescence proof
        if !snapshot.quiescence_proof.all_regions_closed
            || !snapshot.quiescence_proof.no_pending_tasks
            || !snapshot.quiescence_proof.all_obligations_resolved
        {
            return Err("Quiescence proof invalid".to_string());
        }

        // Store snapshot for round-trip verification
        self.snapshot_data = Some(snapshot);

        Ok(())
    }

    pub fn verify_round_trip(&self, original_snapshot: &RuntimeSnapshot) -> bool {
        match &self.snapshot_data {
            Some(restored) => self.compare_snapshots(original_snapshot, restored),
            None => false,
        }
    }

    fn validate_snapshot_integrity(&self, snapshot: &RuntimeSnapshot) -> bool {
        // Validate task-region relationships
        for (_task_id, task_state) in &snapshot.task_states {
            if !snapshot.region_tree.contains_key(&task_state.region_id) {
                return false;
            }
        }

        // Validate obligation-task relationships
        for (_, obligation) in &snapshot.obligation_map {
            if !snapshot.task_states.contains_key(&obligation.task_id) {
                return false;
            }
        }

        // Validate region tree acyclicity
        for (region_id, region) in &snapshot.region_tree {
            if let Some(parent_id) = region.parent_region {
                if parent_id == *region_id {
                    return false; // Self-parent cycle
                }
            }
        }

        true
    }

    fn compare_snapshots(&self, a: &RuntimeSnapshot, b: &RuntimeSnapshot) -> bool {
        a.timestamp == b.timestamp
            && a.task_states.len() == b.task_states.len()
            && a.region_tree.len() == b.region_tree.len()
            && a.obligation_map.len() == b.obligation_map.len()
            && a.quiescence_proof.all_regions_closed == b.quiescence_proof.all_regions_closed
    }

    fn generate_sample_task_states(&self) -> HashMap<u64, TaskState> {
        let mut tasks = HashMap::new();

        for i in 0..5 {
            tasks.insert(
                i,
                TaskState {
                    task_id: i,
                    region_id: i / 2,
                    status: TaskStatus::Completed,
                    logical_time: i * 1000,
                    cancellation_token: None,
                },
            );
        }

        tasks
    }

    fn generate_sample_region_tree(&self) -> HashMap<u64, RegionState> {
        let mut regions = HashMap::new();

        regions.insert(
            0,
            RegionState {
                region_id: 0,
                parent_region: None,
                child_tasks: vec![0, 1],
                child_regions: vec![1, 2],
                status: RegionStatus::Closed,
            },
        );

        regions.insert(
            1,
            RegionState {
                region_id: 1,
                parent_region: Some(0),
                child_tasks: vec![2, 3],
                child_regions: vec![],
                status: RegionStatus::Closed,
            },
        );

        regions.insert(
            2,
            RegionState {
                region_id: 2,
                parent_region: Some(0),
                child_tasks: vec![4],
                child_regions: vec![],
                status: RegionStatus::Closed,
            },
        );

        regions
    }

    fn generate_sample_obligations(&self) -> HashMap<u64, ObligationState> {
        let mut obligations = HashMap::new();

        obligations.insert(
            0,
            ObligationState {
                obligation_id: 0,
                task_id: 0,
                obligation_type: ObligationType::Permit,
                status: ObligationStatus::Committed,
            },
        );

        obligations
    }

    fn generate_logical_clocks(&self) -> HashMap<u64, u64> {
        let mut clocks = HashMap::new();
        for i in 0..5 {
            clocks.insert(i, i * 1000);
        }
        clocks
    }

    fn validate_quiescence(&self) -> QuiescenceProof {
        QuiescenceProof {
            all_regions_closed: true,
            no_pending_tasks: true,
            all_obligations_resolved: true,
            causal_ordering_valid: true,
        }
    }
}

// ================================================================================================
// Supporting Types
// ================================================================================================

#[derive(Debug, Clone)]
pub struct ChaosConfig {
    pub max_events: usize,
    pub injection_probability: f64,
    pub enabled_types: Vec<ChaosEventType>,
}

#[derive(Debug, Clone)]
pub struct TestScenario {
    pub id: String,
    pub description: String,
    pub fault_events: Vec<FaultEvent>,
    pub expected_oracles: Vec<String>,
}

#[derive(Debug, Clone)]
pub struct ScenarioResult {
    pub scenario_id: String,
    pub execution_trace: Vec<TraceEvent>,
    pub oracle_checks: HashMap<String, bool>,
    pub replay_count: u32,
    pub trace_certificate: String,
}

// ================================================================================================
// Conformance Test Matrix
// ================================================================================================

const LAB_CONFORMANCE_CASES: &[ConformanceCase] = &[
    // Chaos Determinism Tests
    ConformanceCase {
        id: "LAB-CHAOS-01",
        section: "chaos.determinism",
        level: RequirementLevel::Must,
        category: TestCategory::ChaosDeterminism,
        description: "Same seed produces identical chaos injection sequences",
    },
    ConformanceCase {
        id: "LAB-CHAOS-02",
        section: "chaos.determinism",
        level: RequirementLevel::Must,
        category: TestCategory::ChaosDeterminism,
        description: "Chaos events maintain deterministic ordering across runs",
    },
    ConformanceCase {
        id: "LAB-CHAOS-03",
        section: "chaos.cancellation",
        level: RequirementLevel::Must,
        category: TestCategory::ChaosDeterminism,
        description: "Cancellation chaos points are reproducible",
    },
    // Scenario Replayability Tests
    ConformanceCase {
        id: "LAB-REPLAY-01",
        section: "scenario.replayability",
        level: RequirementLevel::Must,
        category: TestCategory::ScenarioReplayability,
        description: "Scenarios execute identically on replay with same seed",
    },
    ConformanceCase {
        id: "LAB-REPLAY-02",
        section: "scenario.certificates",
        level: RequirementLevel::Must,
        category: TestCategory::ScenarioReplayability,
        description: "Trace certificates match exactly between runs",
    },
    ConformanceCase {
        id: "LAB-REPLAY-03",
        section: "scenario.oracles",
        level: RequirementLevel::Must,
        category: TestCategory::ScenarioReplayability,
        description: "Oracle reports maintain consistency across replay",
    },
    // Snapshot/Restore Tests
    ConformanceCase {
        id: "LAB-SNAPSHOT-01",
        section: "snapshot.roundtrip",
        level: RequirementLevel::Must,
        category: TestCategory::SnapshotRestore,
        description: "Snapshot → restore preserves runtime state exactly",
    },
    ConformanceCase {
        id: "LAB-SNAPSHOT-02",
        section: "snapshot.quiescence",
        level: RequirementLevel::Must,
        category: TestCategory::SnapshotRestore,
        description: "Restored runtime reaches quiescence correctly",
    },
    ConformanceCase {
        id: "LAB-SNAPSHOT-03",
        section: "snapshot.integrity",
        level: RequirementLevel::Must,
        category: TestCategory::SnapshotRestore,
        description: "Task/region/obligation relationships survive round-trip",
    },
];

// ================================================================================================
// Conformance Tests
// ================================================================================================

#[cfg(test)]
mod tests {
    use super::*;

    fn run_conformance_test(case: &ConformanceCase) -> TestResult {
        match case.id {
            "LAB-CHAOS-01" => test_chaos_determinism_identical_sequences(),
            "LAB-CHAOS-02" => test_chaos_determinism_ordering(),
            "LAB-CHAOS-03" => test_chaos_cancellation_reproducibility(),
            "LAB-REPLAY-01" => test_scenario_replay_identity(),
            "LAB-REPLAY-02" => test_trace_certificate_matching(),
            "LAB-REPLAY-03" => test_oracle_consistency(),
            "LAB-SNAPSHOT-01" => test_snapshot_restore_round_trip(),
            "LAB-SNAPSHOT-02" => test_snapshot_quiescence_preservation(),
            "LAB-SNAPSHOT-03" => test_snapshot_relationship_integrity(),
            _ => TestResult::Skipped {
                reason: "No registered lab conformance case for this id".to_string(),
            },
        }
    }

    fn test_chaos_determinism_identical_sequences() -> TestResult {
        let seed = 42;
        let chaos_config = ChaosConfig {
            max_events: 10,
            injection_probability: 0.8,
            enabled_types: vec![
                ChaosEventType::Cancellation,
                ChaosEventType::Delay {
                    duration: Duration::from_millis(1),
                },
            ],
        };

        let mut runtime1 = MockLabRuntime::new(seed);
        let mut runtime2 = MockLabRuntime::new(seed);

        let events1 = runtime1.inject_chaos_with_seed(&chaos_config);
        let events2 = runtime2.inject_chaos_with_seed(&chaos_config);

        if runtime1.verify_chaos_determinism(&runtime2) {
            TestResult::Pass
        } else {
            TestResult::Fail {
                reason: format!(
                    "Chaos sequences differ: {} vs {} events",
                    events1.len(),
                    events2.len()
                ),
            }
        }
    }

    fn test_chaos_determinism_ordering() -> TestResult {
        let seed = 123;
        let chaos_config = ChaosConfig {
            max_events: 5,
            injection_probability: 1.0, // Always inject for predictable results
            enabled_types: vec![ChaosEventType::Cancellation],
        };

        let mut runtime = MockLabRuntime::new(seed);
        let events = runtime.inject_chaos_with_seed(&chaos_config);

        // Verify sequence ordering
        for window in events.windows(2) {
            if window[0].sequence >= window[1].sequence {
                return TestResult::Fail {
                    reason: "Chaos events not properly ordered by sequence".to_string(),
                };
            }
        }

        TestResult::Pass
    }

    fn test_chaos_cancellation_reproducibility() -> TestResult {
        let seed = 789;
        let chaos_config = ChaosConfig {
            max_events: 3,
            injection_probability: 1.0,
            enabled_types: vec![ChaosEventType::Cancellation],
        };

        let mut runtime1 = MockLabRuntime::new(seed);
        let mut runtime2 = MockLabRuntime::new(seed);

        let events1 = runtime1.inject_chaos_with_seed(&chaos_config);
        let events2 = runtime2.inject_chaos_with_seed(&chaos_config);

        // Check that cancellation events target same tasks
        for (e1, e2) in events1.iter().zip(events2.iter()) {
            if e1.target_task != e2.target_task || e1.event_type != e2.event_type {
                return TestResult::Fail {
                    reason: "Cancellation chaos not reproducible across runs".to_string(),
                };
            }
        }

        TestResult::Pass
    }

    fn test_scenario_replay_identity() -> TestResult {
        let seed = 456;
        let mut runtime = MockLabRuntime::new(seed);

        let scenario = TestScenario {
            id: "test_scenario".to_string(),
            description: "Test scenario for replay".to_string(),
            fault_events: vec![
                FaultEvent {
                    fault_id: "fault1".to_string(),
                    timing: Duration::from_millis(100),
                    fault_type: "cancel".to_string(),
                    target: "task1".to_string(),
                },
                FaultEvent {
                    fault_id: "fault2".to_string(),
                    timing: Duration::from_millis(200),
                    fault_type: "delay".to_string(),
                    target: "task2".to_string(),
                },
            ],
            expected_oracles: vec!["oracle_1".to_string(), "oracle_2".to_string()],
        };

        let result1 = runtime.run_scenario(&scenario);
        let result2 = runtime.run_scenario(&scenario);

        if result1.trace_certificate == result2.trace_certificate {
            TestResult::Pass
        } else {
            TestResult::Fail {
                reason: "Scenario replay produced different results".to_string(),
            }
        }
    }

    fn test_trace_certificate_matching() -> TestResult {
        let seed = 999;
        let mut runtime1 = MockLabRuntime::new(seed);
        let mut runtime2 = MockLabRuntime::new(seed);

        let scenario = TestScenario {
            id: "cert_test".to_string(),
            description: "Certificate test".to_string(),
            fault_events: vec![FaultEvent {
                fault_id: "cert_fault".to_string(),
                timing: Duration::from_millis(50),
                fault_type: "cancel".to_string(),
                target: "task_cert".to_string(),
            }],
            expected_oracles: vec!["cert_oracle".to_string()],
        };

        let result1 = runtime1.run_scenario(&scenario);
        let result2 = runtime2.run_scenario(&scenario);

        if result1.trace_certificate == result2.trace_certificate {
            TestResult::Pass
        } else {
            TestResult::Fail {
                reason: format!(
                    "Trace certificates don't match: {} vs {}",
                    result1.trace_certificate, result2.trace_certificate
                ),
            }
        }
    }

    fn test_oracle_consistency() -> TestResult {
        let seed = 111;
        let mut runtime = MockLabRuntime::new(seed);

        let scenario = TestScenario {
            id: "oracle_test".to_string(),
            description: "Oracle consistency test".to_string(),
            fault_events: vec![FaultEvent {
                fault_id: "oracle_fault".to_string(),
                timing: Duration::from_millis(75),
                fault_type: "delay".to_string(),
                target: "task_oracle".to_string(),
            }],
            expected_oracles: vec!["consistency_oracle".to_string()],
        };

        let result1 = runtime.run_scenario(&scenario);
        let result2 = runtime.run_scenario(&scenario);

        // Compare oracle check results
        if result1.oracle_checks == result2.oracle_checks {
            TestResult::Pass
        } else {
            TestResult::Fail {
                reason: "Oracle results inconsistent across replays".to_string(),
            }
        }
    }

    fn test_snapshot_restore_round_trip() -> TestResult {
        let seed = 222;
        let runtime = MockLabRuntime::new(seed);

        let snapshot = runtime.take_snapshot();
        let mut restored_runtime = MockLabRuntime::new(seed);

        match restored_runtime.restore_from_snapshot(snapshot.clone()) {
            Ok(()) => {
                if restored_runtime.verify_round_trip(&snapshot) {
                    TestResult::Pass
                } else {
                    TestResult::Fail {
                        reason: "Round-trip verification failed".to_string(),
                    }
                }
            }
            Err(e) => TestResult::Fail {
                reason: format!("Snapshot restoration failed: {}", e),
            },
        }
    }

    fn test_snapshot_quiescence_preservation() -> TestResult {
        let seed = 333;
        let runtime = MockLabRuntime::new(seed);

        let snapshot = runtime.take_snapshot();

        if snapshot.quiescence_proof.all_regions_closed
            && snapshot.quiescence_proof.no_pending_tasks
            && snapshot.quiescence_proof.all_obligations_resolved
            && snapshot.quiescence_proof.causal_ordering_valid
        {
            TestResult::Pass
        } else {
            TestResult::Fail {
                reason: "Quiescence proof invalid in snapshot".to_string(),
            }
        }
    }

    fn test_snapshot_relationship_integrity() -> TestResult {
        let seed = 444;
        let runtime = MockLabRuntime::new(seed);

        let snapshot = runtime.take_snapshot();

        // Verify task-region relationships
        for (task_id, task_state) in &snapshot.task_states {
            if !snapshot.region_tree.contains_key(&task_state.region_id) {
                return TestResult::Fail {
                    reason: format!(
                        "Task {} references non-existent region {}",
                        task_id, task_state.region_id
                    ),
                };
            }
        }

        // Verify obligation-task relationships
        for (obligation_id, obligation) in &snapshot.obligation_map {
            if !snapshot.task_states.contains_key(&obligation.task_id) {
                return TestResult::Fail {
                    reason: format!(
                        "Obligation {} references non-existent task {}",
                        obligation_id, obligation.task_id
                    ),
                };
            }
        }

        TestResult::Pass
    }

    #[test]
    fn lab_conformance_full_suite() {
        let mut pass_count = 0;
        let mut fail_count = 0;
        let mut skip_count = 0;

        for case in LAB_CONFORMANCE_CASES {
            let result = run_conformance_test(case);
            match result {
                TestResult::Pass => {
                    pass_count += 1;
                    println!("✓ {}: {}", case.id, case.description);
                }
                TestResult::Fail { reason } => {
                    fail_count += 1;
                    println!("✗ {}: {} - {}", case.id, case.description, reason);
                }
                TestResult::Skipped { reason } => {
                    skip_count += 1;
                    println!("⚠ {}: {} - {}", case.id, case.description, reason);
                }
            }
        }

        let total = pass_count + fail_count + skip_count;
        println!(
            "\nLab Conformance Results: {}/{} passed, {} failed, {} skipped",
            pass_count, total, fail_count, skip_count
        );

        // Require 100% MUST compliance
        let must_cases: Vec<_> = LAB_CONFORMANCE_CASES
            .iter()
            .filter(|c| c.level == RequirementLevel::Must)
            .collect();

        let mut must_failures = 0;
        for case in &must_cases {
            if let TestResult::Fail { .. } = run_conformance_test(case) {
                must_failures += 1;
            }
        }

        assert_eq!(
            must_failures, 0,
            "{} MUST requirements failed",
            must_failures
        );
    }

    // Property-based testing
    proptest! {
        #[test]
        fn prop_chaos_determinism(seed in 0u64..10000, max_events in 1usize..50) {
            let chaos_config = ChaosConfig {
                max_events,
                injection_probability: 0.5,
                enabled_types: vec![ChaosEventType::Cancellation, ChaosEventType::Delay { duration: Duration::from_millis(1) }],
            };

            let mut runtime1 = MockLabRuntime::new(seed);
            let mut runtime2 = MockLabRuntime::new(seed);

            runtime1.inject_chaos_with_seed(&chaos_config);
            runtime2.inject_chaos_with_seed(&chaos_config);

            prop_assert!(runtime1.verify_chaos_determinism(&runtime2));
        }

        #[test]
        fn prop_snapshot_round_trip(seed in 0u64..10000) {
            let runtime = MockLabRuntime::new(seed);
            let snapshot = runtime.take_snapshot();
            let mut restored_runtime = MockLabRuntime::new(seed);

            let restore_result = restored_runtime.restore_from_snapshot(snapshot.clone());
            prop_assert!(restore_result.is_ok());
            prop_assert!(restored_runtime.verify_round_trip(&snapshot));
        }

        #[test]
        fn prop_scenario_replay_consistency(seed in 0u64..10000, fault_count in 1usize..10) {
            let mut runtime = MockLabRuntime::new(seed);

            let scenario = TestScenario {
                id: format!("prop_test_{}", seed),
                description: "Property-based test scenario".to_string(),
                fault_events: (0..fault_count).map(|i| FaultEvent {
                    fault_id: format!("fault_{}", i),
                    timing: Duration::from_millis((i as u64) * 50),
                    fault_type: "cancel".to_string(),
                    target: format!("task_{}", i),
                }).collect(),
                expected_oracles: vec![],
            };

            let result1 = runtime.run_scenario(&scenario);
            let result2 = runtime.run_scenario(&scenario);

            prop_assert_eq!(result1.trace_certificate, result2.trace_certificate);
        }
    }
}