def stopTest(self, test):
super().stopTest(test)
new_cwd = safe_getcwd()
if self.old_cwd is None or new_cwd is None \
or self.old_cwd != new_cwd:
raise RuntimeError("working directory changed during test")
def startTest(self, test):
self.old_cwd = safe_getcwd()
super().startTest(test)
