Remove the $wgCaches[CACHE_DB] = false; line added in
r74552.
It produces an strange failure when going out of ParserTest::setUp() scope.
(eg. $parserMemc becoming back false instead of a FakeMemcached, related to
using a reference in $wgMemc = &wfGetMainCache() )
Can be checked when running phpunit.php includes/ParserOptionsTest.php
See
https://bugzilla.wikimedia.org/show_bug.cgi?id=26244#c4
No errors found in sqlite without it.