Module testing 

Deterministic test doubles: a virtual clock and a single-threaded runtime that runs the cache’s detached work to quiescence on demand (feature test-util).

The cache’s detached work and timers go through Runtime, so a single-threaded pool can run every task to quiescence after each command (the causally-ready-v1 settlement of the formal replay) and deliver timers only when a test advances the clock.

Structs

Absent

The test-only absent value of confirmed-mismatch warnings.

StepRuntime

The test runtime handle: collects tasks for the pool and registers timers on the virtual clock.

TestExecutor

The controlled executor of one test: a single-threaded pool plus the clock and runtime handle every cache instance under test shares.

VirtualClock

Virtual wall, elapsed and scheduler clocks. Scheduler time is what timers are registered against; it moves only when a history delivers timers, so a silent shift never fires a deliberately held timer.

Constants

ABSENT_MARKER

The name Absent serializes as a unit struct.

WALL_EPOCH_MS

Epoch of every controlled history: 2026-09-08T12:00:00.000Z.

Functions

grid_clock

The production SystemClock built over a VirtualClock.