GraphBatch Tests

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These tests cover the engine-backed GraphBatch helper used for bulk graph ingest.

Covered Behavior

1) create vertices and edges

Creates Person vertices through GraphBatch, buffers Knows edges, and verifies the final outgoing traversal from Alice.

2) create_vertices returns RIDs

Verifies that create_vertices(...) returns RID strings for every requested row, including sparse property rows such as None.

3) invalid WAL flush mode

Confirms that invalid wal_flush values fail early with ValueError instead of being silently accepted.

4) parallel flush smoke

Exercises parallel_flush=True and verifies final vertex and edge counts plus graph connectivity.

Why It Matters

GraphBatch is the repository's preferred bulk graph-ingest path from Python, so these tests protect the performance-oriented API surface and its configuration validation behavior.