Failing test: X-Pack Jest Tests.x-pack/plugins/task_manager/server/lib - Bulk Operation Buffer createBuffer() batch updates can be customised to execute after a certain period

[kibanamachine]

A test failed on a tracked branch

Error: expect(jest.fn()).toHaveBeenCalledTimes(expected)

Expected number of calls: 2
Received number of calls: 1
    at setTimeout (/dev/shm/workspace/kibana/x-pack/plugins/task_manager/server/lib/bulk_operation_buffer.test.ts:83:32)
    at Timeout.callback [as _onTimeout] (/dev/shm/workspace/kibana/node_modules/jsdom/lib/jsdom/browser/Window.js:661:19)
    at ontimeout (timers.js:436:11)
    at tryOnTimeout (timers.js:300:5)
    at listOnTimeout (timers.js:263:5)
    at Timer.processTimers (timers.js:223:10)

First failure: Jenkins Build

[elasticmachine]

Pinging @elastic/kibana-test-triage (failed-test)

[spalger]

14 Failures between PRs and master

Skipped

master: 8305d9f
7.x/7.10: 5ee3467

Attempted to skip this in 7.9 as well but the test is new as of 6378647#diff-7fe4566426f4487b3314a1020b6e0cba cc @gmmorris

[elasticmachine]

Pinging @elastic/kibana-alerting-services (Team:Alerting Services)

[mikecote]

Looks like usage of fake clocks will help with the flakiness.

[gmmorris]

Sadly fake clocks don't seem to work with Rxjs operators... annoyingly.

I'm trying to find a better way of testing this...

[spalger]

Maybe you want to customize the Rxjs scheduler in the tests?

[gmmorris]

I've simplified the tests... hoping that'll be enough 😬
If it isn't then I'll go down that route.