In PHP 8.2 and later, setting a value to an undeclared class property is
deprecated and emits a deprecation notice.
So we need to add missing class properties that still need to be declared.
At the test_transaction_with_events() I changed $this->_called into $called local var,
since the $called is used inside the anonymous function I added the third param as
a variable passed by reference so the last assert can get the newest value.
81a5016ec7