Christopher Jones has posted a new item today concerning code coverage and the OCI8 drivers in the latest release of PHP - version 5.2 - including some of the stats.
A week or so ago he [Nuno Lopes] enabled oci8 tests on PHP's Test and Code Coverage Analysis system. The PHP 5.2 Code Coverage numbers are in good shape for the oci8 extension. The work done on re-factoring the extension and its subsequent maintenance mostly by Antony Dovgal is commendable.
The resulting report shows the oci8 drivers topping the charts of amount of coverage with the SQLite drivers following in second place (later, he found the Berkly DB coverage came in second with 76.8%).