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I am adding 2.7. It is ok to add tests to the stable series release AFAIK. Moreover, I believe the unittests should be written for 2.7 first. Since 3.x port of trace was done without the benefit of a test suite, it is likely that there are many differences in behavior that should be eliminated. (See issue9317.)
Please start with fine-graned "white-box" API tests. These are easier because you don't need to set up external scripts, capture output, etc. Just create a Trace object in setUp and call its various methods in test cases.