def log(self, **kwargs):
        return self
test the return value from barrier.wait
dataset/ETHPy150Open opentracing/opentracing-python/opentracing/span.py/Span.log--crossover with--dataset/ETHPy150Open amrdraz/kodr/app/brython/www/src/Lib/test/lock_tests.py/BarrierTests.test_wait_return