一种想法

class TestCase:
    def run(self, result=None):
        if result is None:
        result=self.defaultTestResult()
        result.startTest(self)
        testMethod = getattr(self, self._testMethodName)
        try:
            try:
                self.setUp()
            except KeyboardInterrupt:
                raise
            except:
                result.addError(self, self._exc_info())
                return
 
            ok = False
             
            n = 1
            try:
                while n<=self.repeat or ok is False:
                    try:
                        testMethod()
                        ok = True
                        break
                    except Exception as e:
                        if n == self.repeat:
                            raise self.failureException(str(e))
                    finally:
                        n+=1
            except self.failureException:
                result.addFailure(self, self._exc_info())
            except KeyboardInterrupt:
                raise
            except:
                result.addError(self, self._exc_info())
 
            try:
                self.tearDown()
            except KeyboardInterrupt:
                raise
            except:
                result.addError(self, self._exc_info())
                ok = False
            if ok: result.addSuccess(self)
        finally:
            result.stopTest(self)