We first adopted Jasmine for our internal JavaScript tests in ArangoDB (https://www.arangodb.com) to replace the ancient and inconvenient framework we were using before. It worked, kinda, but it was a mess. We still needed something to expose to developers wishing to test their own apps in the DB and doing that with Jasmine proved to be pretty much impossible.

It was extremely straightforward to integrate with Mocha, though. We just needed to stub out some of the node.js-specific code and provide a very small wrapper to provide our own module loader and reporting plugins. There is an active effort to split up Mocha into multiple modules in order to make it more portable, which would make the stubbing unnecessary, too.