I'm attaching a file with some unit tests for Lib/trace.py module in Python 2.7. Currently the unit tests check the API only, for line counting, func call counting and function caller relationships, because these can be tested through the API, without capturing stdout and resulting coverage files. All in all, these features are given a pretty good coverage.

I've named the file test_trace_module.py because test_trace.py hasn't yet been renamed in 2.7 and I don't want to get into the naming mess.

More tests can (and will) be added, but this is a start.