Documentation

Backend-agnostic stress test suite

Test extreme version expectation conflicts 100 concurrent writers all try to use the same ExactVersion cursor. Exactly one should succeed, 99 should fail with ConsistencyError.

Test massive version advancement Advance a stream version 1000 times sequentially, then verify: - Very old cursors are rejected - Mid-journey cursors are rejected - Current cursor still works

Test version skew with stale expectations Create a stream, advance it multiple times, then verify: - Stale cursors from several versions ago are rejected - Current cursor works

High contention test - 50 concurrent writers to same stream with Any expectation All should succeed since Any doesn't require version checking

Test version expectation performance under load Creates 10-20 streams, performs 100 concurrent writes with mixed expectations Verifies reasonable performance (< 5 seconds) and correct success/failure ratios

Test cascading failures with version dependencies Create a chain A -> B -> C, update A, verify old cursor for A is rejected

Test multi-stream atomic operations Create 10 streams, initialize half, try batch with mixed expectations that should fail Verify no partial writes occurred and correct batch succeeds

Test rapid version advancement Advance a stream version 100 times rapidly, verify old cursors are invalid

Test version expectations with connection failures Performs 50 operations with random delays that might cause timeouts Verifies at least some successes despite connection issues

Test version expectation deadlock scenarios Create two streams, start two transactions that lock them in different order Verify both complete within reasonable time (backend should handle deadlocks)