/**
 * Contract Tests for TestGraphExpander
 *
 * These tests verify that TestGraphExpander correctly implements
 * the GraphExpander interface contract, with particular focus on:
 * - Edge array → adjacency list conversion
 * - Factory functions (star, hub, grid, chain)
 * - Degree calculation consistency
 * - Directed vs undirected graph handling
 *
 * TestGraphExpander is a simpler adapter used in unit tests,
 * with direct adjacency list construction rather than lazy loading.
 */
export {};
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