Crate fusee_sim 

Deterministic simulation testing for Fusee.

The real shard runtime, journal machines and Rust SDK run inside one thread under a seeded scheduler. The disk tears writes, loses unflushed data at crashes and fails flushes; messages between shards are delayed and lost with the process. A mock external service logs every call. A seed reproduces a run exactly.

The checkers, after every recovery and at the end:

• every acknowledged start and signal exists;
• a result once reported never changes;
• no external call was made with inputs the recovered journal contradicts (one idempotency key, two different inputs);
• once faults stop, every workflow finishes.

scenario runs your own workflows the same way.

Re-exports

pub use scenario::Scenario;

pub use world::Failure;

pub use world::Report;

pub use world::SimConfig;

pub use world::run_seed;

Modules

disk

A simulated disk.

env

SimEnv: the shard runtime’s I/O on a simulated disk and clock.

rng

A small seeded generator (SplitMix64). Every random choice in a simulation comes from one of these, so a seed reproduces a run exactly.

scenario

Your workflows under the simulator.

world

The simulated world: shards on one machine, a client, an external service, a seeded scheduler and fault injection.

Functions

sleep

Waits d of simulated time, inside a step body under the simulator.