Replaces \TestingAccessWrapper (defined in core) with
\Wikimedia\TestingAccessWrapper (defined in the composer package
wikimedia/testing-access-wrapper).
See https://gerrit.wikimedia.org/r/#/q/topic:librarize-testing-access-wrapper
for downstream patches.
The core version of the class is kept around for a while to avoid
circular dependency problems.
Bug: T163434
Change-Id: I52cc257e593da3d6c3b01a909e554a950225aec8
* Match behaviour of MapCacheLRU and ProcessCacheLRU.
* Add missing unit tests for TTL and maxCacheKeys eviction behaviour.
Change-Id: I559eae1cd336274b21728e86775cfbad7e2f2c6d
Follows-up 7cddc22.
Also use PHPUnit_Framework_TestCase as parent instead of MediaWikiTestCase
in preparation for library extraction.
Change-Id: I0e68e56ecf8376b52a59c33ba6dd18b671bdcfc9