//! Distributed graph database tests
//!
//! Tests for clustering, replication, sharding, and federation.

#[test]
fn test_placeholder_distributed() {
    // TODO: Implement distributed tests when distributed features are available
    assert!(true);
}

// ============================================================================
// Cluster Setup Tests
// ============================================================================

// #[test]
// fn test_three_node_cluster() {
//     // TODO: Set up a 3-node cluster
//     // Verify all nodes can communicate
//     // Verify leader election works
// }

// #[test]
// fn test_cluster_discovery() {
//     // TODO: Test node discovery mechanism
//     // New node should discover existing cluster
// }

// ============================================================================
// Data Sharding Tests
// ============================================================================

// #[test]
// fn test_hash_based_sharding() {
//     // TODO: Test that data is distributed across shards based on hash
//     // Create nodes on different shards
//     // Verify they end up on correct nodes
// }

// #[test]
// fn test_range_based_sharding() {
//     // TODO: Test range-based sharding for ordered data
// }

// #[test]
// fn test_shard_rebalancing() {
//     // TODO: Test automatic rebalancing when adding/removing nodes
// }

// ============================================================================
// Replication Tests
// ============================================================================

// #[test]
// fn test_synchronous_replication() {
//     // TODO: Write to leader, verify data appears on all replicas
//     // before write is acknowledged
// }

// #[test]
// fn test_asynchronous_replication() {
//     // TODO: Write to leader, verify data eventually appears on replicas
// }

// #[test]
// fn test_replica_consistency() {
//     // TODO: Verify all replicas have same data
// }

// #[test]
// fn test_read_from_replica() {
//     // TODO: Verify reads can be served from replicas
// }

// #[test]
// fn test_replica_lag_monitoring() {
//     // TODO: Monitor replication lag
// }

// ============================================================================
// Leader Election Tests
// ============================================================================

// #[test]
// fn test_leader_election_on_startup() {
//     // TODO: Start cluster, verify leader is elected
// }

// #[test]
// fn test_leader_failover() {
//     // TODO: Kill leader, verify new leader is elected
//     // Verify cluster remains available
// }

// #[test]
// fn test_split_brain_prevention() {
//     // TODO: Simulate network partition
//     // Verify that split brain doesn't occur
// }

// ============================================================================
// Distributed Queries
// ============================================================================

// #[test]
// fn test_cross_shard_query() {
//     // TODO: Query that requires data from multiple shards
//     // Verify correct results are returned
// }

// #[test]
// fn test_distributed_aggregation() {
//     // TODO: Aggregation query across shards
//     // COUNT, SUM, etc. should work correctly
// }

// #[test]
// fn test_distributed_traversal() {
//     // TODO: Graph traversal that crosses shard boundaries
// }

// #[test]
// fn test_distributed_shortest_path() {
//     // TODO: Shortest path query where path crosses shards
// }

// ============================================================================
// Distributed Transactions
// ============================================================================

// #[test]
// fn test_two_phase_commit() {
//     // TODO: Transaction spanning multiple shards
//     // Verify 2PC ensures atomicity
// }

// #[test]
// fn test_distributed_deadlock_detection() {
//     // TODO: Create scenario that could cause distributed deadlock
//     // Verify detection and resolution
// }

// #[test]
// fn test_distributed_rollback() {
//     // TODO: Transaction that fails on one shard
//     // Verify all shards roll back
// }

// ============================================================================
// Fault Tolerance Tests
// ============================================================================

// #[test]
// fn test_node_failure_recovery() {
//     // TODO: Kill a node, verify cluster recovers
//     // Data should still be accessible via replicas
// }

// #[test]
// fn test_network_partition_handling() {
//     // TODO: Simulate network partition
//     // Verify cluster handles it gracefully
// }

// #[test]
// fn test_data_recovery_after_crash() {
//     // TODO: Node crashes, then restarts
//     // Verify it can rejoin cluster and catch up
// }

// #[test]
// fn test_quorum_based_operations() {
//     // TODO: Verify operations require quorum
//     // If quorum lost, writes should fail
// }

// ============================================================================
// Federation Tests
// ============================================================================

// #[test]
// fn test_cross_cluster_query() {
//     // TODO: Query that spans multiple independent clusters
// }

// #[test]
// fn test_federated_search() {
//     // TODO: Search across federated clusters
// }

// #[test]
// fn test_cluster_to_cluster_replication() {
//     // TODO: Data replication between clusters
// }

// ============================================================================
// Consistency Tests
// ============================================================================

// #[test]
// fn test_strong_consistency() {
//     // TODO: With strong consistency level, verify linearizability
// }

// #[test]
// fn test_eventual_consistency() {
//     // TODO: With eventual consistency, verify data converges
// }

// #[test]
// fn test_causal_consistency() {
//     // TODO: Verify causal relationships are preserved
// }

// #[test]
// fn test_read_your_writes() {
//     // TODO: Client should always see its own writes
// }

// ============================================================================
// Performance Tests
// ============================================================================

// #[test]
// fn test_horizontal_scalability() {
//     // TODO: Measure throughput with 1, 2, 4, 8 nodes
//     // Verify near-linear scaling
// }

// #[test]
// fn test_load_balancing() {
//     // TODO: Verify load is balanced across nodes
// }

// #[test]
// fn test_hotspot_handling() {
//     // TODO: Create hotspot (frequently accessed data)
//     // Verify system handles it gracefully
// }

// ============================================================================
// Configuration Tests
// ============================================================================

// #[test]
// fn test_replication_factor_configuration() {
//     // TODO: Test different replication factors (1, 2, 3)
// }

// #[test]
// fn test_consistency_level_configuration() {
//     // TODO: Test different consistency levels
// }

// #[test]
// fn test_partition_strategy_configuration() {
//     // TODO: Test different partitioning strategies
// }

// ============================================================================
// Monitoring and Observability
// ============================================================================

// #[test]
// fn test_cluster_health_monitoring() {
//     // TODO: Verify cluster health metrics are available
// }

// #[test]
// fn test_shard_distribution_metrics() {
//     // TODO: Verify we can monitor shard distribution
// }

// #[test]
// fn test_replication_lag_metrics() {
//     // TODO: Verify replication lag is monitored
// }

// ============================================================================
// Backup and Restore
// ============================================================================

// #[test]
// fn test_distributed_backup() {
//     // TODO: Create backup of distributed database
// }

// #[test]
// fn test_distributed_restore() {
//     // TODO: Restore from backup to new cluster
// }

// #[test]
// fn test_point_in_time_recovery() {
//     // TODO: Restore to specific point in time
// }