In my previous post I briefly introduced an online public vCO simulator, that can be used for test purpose. To quote the documentation

This simulator has been developed for the Google App Engine platform. Right now it is able to simulate the lifecycle of a small set of reference “workflows”, thus providing a good base for experimentation.

The documentation of the Python bindings uses that simulator, so that running the examples is as simple as a copy/paste operation.

Technically speaking, it works by associating time slots to workflow states, and reconsidering those slots when a new action (like canceling the workflow run) “rewrites” the future. Therefore, there is no notion of “live process”, that could quickly become a limitation.

The simulator itself is free software, released under MIT license. The source code is available here. Hope it can prove useful to someone !