Pending timers using fakeAsync

[Undestor]

Describe the bug

After updating @apollo/client (from v.3.8.10 to v.3.9.xx) we have pending timers in our tests using fakeAsync. I am not 100% sure if this is a problem which only occurs using the testing utils (apollo-angular/testing).

To Reproduce
The following code snippet has no pending timers using @apollo/client v.3.8.10. After updating to v.3.9.xx is has 3 pending timers.

it('should have no pending timers', fakeAsync(() => {
    const apollo = TestBed.inject(Apollo)
    apollo
	    .query<SomeQueryType>({
		    query: SomeQuery,
		    variables: { id: someUuid },
		    errorPolicy: 'all',
	    })
	    .subscribe(() => console.log('value changed'))
    apolloCtrl.expectOne(extractOperationNameFromQuery(SomeQuery)).flush(SomeQueryPayload)
    tick()
}))

Expected behavior

There should be no timers pending

Environment:

- @angular/cli@17.3.0
- @angular/core@17.3.3
- @apollo/client@3.9.11
- apollo-angular@6.0.0
- graphql@16.8.1
- typescript@5.4.4

Additional context

[PowerKiKi]

I experienced the same behavior change. But since apollo-angular did not change anything, I expect this should be reported to @apollo/client, not here.

In the meantime, you can use flush(); at the end of your tests, as a workaround to discard those pending timers.