Some other test could have added their own logs, for example
deprecated notice. In that case, the first test will fail because
the log array already has some content :-b
The first ones were failing because the test suite ran on gallium without
MWDebug being initialized. This is now the case since r109033.
The second part was failling because PHPUnit on gallium does not have
the assertCount() method. Use a assertEquals() / count() workaround instead.
Tests added by 108873
Reverts r108877
