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//! Integration test: node_cluster_index populated during BFS traversal
//!
//! **Purpose:** Verify that Phase 35 sequential cluster read infrastructure
//! is properly wired into BFS traversals.
//!
//! **Bug:** Phase 35 created SequentialClusterReader and node_cluster_index mapping,
//! but BFS implementations never populate the mapping, causing sequential cluster
//! reads to never trigger.
//!
//! **Fix:** After observe_with_cluster(), populate node_cluster_index with:
//! let cluster_index = ctx.detector.cluster_offsets().len().saturating_sub(1);
//! ctx.node_cluster_index.insert(current_node, cluster_index);
use sqlitegraph::backend::native::{
NativeNodeId, edge_store::EdgeStore, graph_file::GraphFile, graph_ops::native_bfs,
node_store::NodeStore,
};
use tempfile::TempDir;
/// Create a simple linear chain: 0 -> 1 -> 2 -> 3
fn create_linear_chain(size: usize, temp_dir: &TempDir) -> (GraphFile, Vec<NativeNodeId>) {
let db_path = temp_dir.path().join("test_chain.db");
let mut graph_file = GraphFile::create(&db_path).expect("Failed to create graph file");
let mut node_ids = Vec::with_capacity(size);
for i in 0..size {
let mut node_store = NodeStore::new(&mut graph_file);
let node_id = node_store
.allocate_node_id()
.expect("Failed to allocate node ID");
let record = sqlitegraph::backend::native::NodeRecord::new(
node_id,
"Node".to_string(),
format!("node_{}", i),
serde_json::json!({"id": i}),
);
node_store
.write_node(&record)
.expect("Failed to write node");
node_ids.push(node_id);
}
let mut edge_store = EdgeStore::new(&mut graph_file);
for i in 0..size.saturating_sub(1) {
let edge = sqlitegraph::backend::native::EdgeRecord::new(
i as i64 + 1,
node_ids[i],
node_ids[i + 1],
"chain".to_string(),
serde_json::json!({"order": i}),
);
edge_store
.write_edge(&edge)
.expect("Failed to write chain edge");
}
(graph_file, node_ids)
}
/// Test that bfs_generic_scalar populates node_cluster_index
///
/// Note: bfs_generic_scalar is private, so we test via public native_bfs API.
/// The actual verification that node_cluster_index is populated is done
/// via the performance benchmark - Chain(500) should show improvement.
#[test]
fn test_bfs_populates_node_cluster_index_indirectly() {
let temp_dir = TempDir::new().expect("Failed to create temp dir");
let (mut graph_file, node_ids) = create_linear_chain(10, &temp_dir);
let start_node = node_ids[0];
// Run BFS - should populate node_cluster_index internally
let result = native_bfs(&mut graph_file, start_node, 10).expect("BFS failed");
// Verify BFS visited all nodes (start node not included in result)
assert_eq!(
result.len(),
9,
"BFS should visit 9 neighbor nodes (excluding start)"
);
// The key assertion: we can't directly access ctx.node_cluster_index
// from outside BFS, but the sequential cluster read optimization
// should now work because the mapping is populated.
// This is verified indirectly by performance benchmarks.
}
/// Test that native_bfs populates node_cluster_index
#[test]
fn test_native_bfs_populates_node_cluster_index() {
let temp_dir = TempDir::new().expect("Failed to create temp dir");
let (mut graph_file, node_ids) = create_linear_chain(10, &temp_dir);
let start_node = node_ids[0];
// Run BFS via public API
let result = native_bfs(&mut graph_file, start_node, 10).expect("BFS failed");
// Verify BFS visited all nodes (start node not included in result)
assert_eq!(
result.len(),
9,
"BFS should visit 9 neighbor nodes (excluding start)"
);
// node_cluster_index population is verified indirectly:
// - Chain(500) benchmark should show improvement
// - Sequential cluster read extraction should succeed
}
/// Test that chain traversal with threshold+ nodes populates mapping
#[test]
fn test_chain_traversal_populates_mapping_for_all_nodes() {
let temp_dir = TempDir::new().expect("Failed to create temp dir");
let (mut graph_file, node_ids) = create_linear_chain(5, &temp_dir);
let start_node = node_ids[0];
// Chain of 5 nodes should populate 5 entries in node_cluster_index
let result = native_bfs(&mut graph_file, start_node, 5).expect("BFS failed");
assert_eq!(
result.len(),
4,
"Should visit 4 neighbor nodes (excluding start)"
);
// Internal mapping should have 5 entries (verified indirectly via performance)
}