This past week I did some work looking into a bug in simpletest that was holding it back from a 5.0 release. Since a lot of my current work is being done against simpletest a 5.0 release will make it a lot simpler for me to do my work. It looks like there could be some bugs in the simpletest browser with regards to cookie and session handling.
I've also been working on the loadtest module stats display. Every time you run a test the test times are grouped and recorded to the database. Each group of tests has a set of modules, tests, and corresponding durations for the test run times. It's been challenging figuring out the best way to display the data so that it's meaningful and readable. Over the course of building a site there could easily have been dozens of tests run all with varying modules.
I'm just starting to figure out how to define good load tests. The first step is figuring out what kind of metrics are useful to measure. For example:
* do any specific modules cause performance to significantly degrade?
* does sites performance increase as it should when load balancing
Drupal across multiple servers?