[QA] Test for concurrent ocm sharing

[saw-jan]

Original: #10971 (comment)

...are there by any chance some concurrency tests already? Something like creating two OCM shares at "the same time" (I'm not sure if we need / can achieve exact same time execution). I'd be curios if we could see something like race condition situations with the current single file JSON backend if we send multiple requests at once.

Similar to owncloud/QA#828 but only do multiple concurrent shares by a user. Currently, our test infrastructure doesn't support parallel requests (at least using scenario steps). But it should be possible to do the parallel requests in php.

Parallel requests example:

ocis/tests/acceptance/bootstrap/Provisioning.php

Lines 592 to 606 in 210f337

	$body = GraphHelper::prepareCreateUserPayload(
	$attributesToCreateUser['userid'],
	$attributesToCreateUser['password'],
	$attributesToCreateUser['email'],
	$attributesToCreateUser['displayname']
	);
	$request = GraphHelper::createRequest(
	$this->getBaseUrl(),
	$this->getStepLineRef(),
	"POST",
	'users',
	$body,
	);
	// Add the request to the $requests array so that they can be sent in parallel.
	$requests[] = $request;

Open Task:

• implement concurrent multiple ocm sharing [tests-only][full-ci] added test to share resources concurrently to federated user #11039
  • From serverA, create more than two shares parallely
  • From serverB, check that all shares are available with correct permissions