Module testing 

In-process workflow simulation, used by orbit test and orbit simulate.

The Simulator runs the real Engine over an in-memory store with a manual clock. It acts as the worker for every task (asking a TaskHandler for each result), starts child workflows like the server does, sends signals as soon as the execution waits for them, and advances durable time (sleeps, retry backoff, timeouts) straight to the next wake-up whenever nothing else can happen, so simulations finish instantly and deterministically.

Structs

MockHandler

The worker used by orbit test: answers from the test’s mocks.

SampleHandler

The worker used by orbit simulate: fixed results and failures by task name, and a generated sample for every other task.

SimulatedExecution

One execution of a finished simulation.

Simulation

Simulator

TaskCall

One task handed to the simulated worker.

TestResult

The outcome of one test.

Enums

TaskOutcome

What the simulated worker does with one task.

Constants

ROOT_EXECUTION_ID

Id of the execution a simulation starts (children get derived ids).

SIMULATION_EPOCH_MS

Simulated time starts at 2026-01-01T00:00:00Z.

Traits

TaskHandler

Functions

run_test

Run one compiled test against workflows (which must include the tested workflow and its children).

sample_value

A deterministic, type-valid sample value (used by orbit simulate for tasks without a mock). name is the field the value is for.

simulate

Run workflow once with handler acting as every worker.