warning-producing tests #27
Description
It may be useful, especially for writing tests which are to be run by someone else to test for conformance, to have tests which never fail, but may produce a warning if the behaviour is not the expected.
This may be a special case of a more general "diagnostic" test, which does not fail but may report information about what it learned about the behaviour when running the test. For example, execution time, output, memory usage, platform dependent behaviour, actual implementation of unspecified behaviour, etc.