def startTest(self, test):
        super(Reporter, self).startTest(test)
        if self._startTime is None:
            self._startTime = self._getTime()
        self._warningCache = set()
Return compute node stats from all child cells.
dataset/ETHPy150Open twisted/twisted/twisted/trial/reporter.py/Reporter.startTest--crossover with--dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/cells/messaging.py/MessageRunner.compute_node_stats