/**
 * Contract Tests for BenchmarkGraphExpander
 *
 * These tests verify that BenchmarkGraphExpander correctly implements
 * the GraphExpander interface contract, with particular focus on:
 * - Undirected graph edge handling (forward + reverse edges)
 * - Binary search correctness for edge lookup
 * - Lazy adjacency building
 * - Degree calculation consistency
 *
 * Context: The BenchmarkGraphExpander bug (missing reverse edge lookup)
 * caused universal false negatives in coverage metrics. These tests
 * prevent similar bugs by validating adapter implementation correctness.
 */
export {};
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