jest-fake-timers

Upstream: https://github.com/facebook/jest/tree/v27.4.7/packages/jest-fake-timers

Fake timers implementation for Jest Roblox. Activated via jest.useFakeTimers(). The API is aligned with Jest's "modern" fake timers, but the implementation is built natively for the Roblox engine.

Mocked timers

• delay, tick, time
• os.time, os.clock
• task.delay, task.cancel, task.wait
• DateTime.now

Engine frame time

Jest Roblox fake timers support a configurable engine frame time via jest.setEngineFrameTime(ms). By default this is 0 (continuous time). When set, timers are processed in batches delineated by frame boundaries — a timer fires in the first frame after its scheduled time.