tests.integration.test_thread_safety.test_concurrent_futures_trav_slow

tests.integration.test_thread_safety.test_concurrent_futures_trav_slow(graph_clrs09_22_6, trav)

Ensure reading from a graph is safe across many threads concurrently, 512 times.

Creates a graph, then tries to traverse it in a multi-threaded manner many times to induce any simultaneous-access issues.