MockTimers

Mocking timers is a technique commonly used in software testing to simulate and control the behavior of timers, such as setInterval and setTimeout, without actually waiting for the specified time intervals.

The MockTimers API also allows for mocking of the Date constructor and setImmediate/clearImmediate functions.

The MockTracker provides a top-level timers export which is a MockTimers instance.

Since

v20.4.0

Constructors

MockTimers

constructor()

Functions

enable

fun enable(options: MockTimersOptions = definedExternally)

Enables timer mocking for the specified timers.

reset

fun reset()

This function restores the default behavior of all mocks that were previously created by this MockTimers instance and disassociates the mocks from the MockTracker instance.

runAll

fun runAll()

Triggers all pending mocked timers immediately. If the Date object is also mocked, it will also advance the Date object to the furthest timer's time.

setTime

fun setTime(time: Number)

You can use the .setTime() method to manually move the mocked date to another time. This method only accepts a positive integer. Note: This method will execute any mocked timers that are in the past from the new time. In the below example we are setting a new time for the mocked date.

tick

fun tick(milliseconds: Number)

Advances time for all mocked timers.