I'm planning to use various spring libraries in a mission-critical system. The client asks us to provide unit tests with 70% statement coverage of any code we develop for this project. We're allowed to use open source libraries, but the client wants some information about how much testing has been applied to these libraries, preferably including the unit test coverage achieved. Clearly I'm not going to write my own unit tests for Spring code just to satisfy this, but I was thinking, surely someone has written unit tests for spring libraries. Is there any public information on this (e.g. the test plan or objectives, test code, results)? Has anyone measured the coverage achieved by the tests? I've searched for this info on-line but couldn't find much. Maybe it's somewhere in Spring JIRA system, or the Git hub, or the Gradle build configuration?