import sys, traceback, gc
import unittest

class TC(unittest.TestCase):
    def clInstanceA(self):
        print("TC.clInstanceA", self)
    def clInstanceB(self):
        print("TC.clInstanceB", self)
        ##CLIB / 0
    def clInstanceC(self):
        print("TC.clInstanceC", self)
        ##CLIC / 0
    def setUp(self):
        print("TC.setUp", self)
        self.addCleanup(self.clInstanceA)
        self.addCleanup(self.clInstanceB)
        self.addCleanup(self.clInstanceC)
        ##0 / 0
    def tearDown(self):
        print("TC.tearDown", self)
        ##9 / 0
    @classmethod
    def clClass(self):
        print("TC.clClass", self)
        CLC / 0
    @classmethod
    def setUpClass(cls):
        print("TC.setUpClass", cls)
        cls.addClassCleanup(cls.clClass)
        ##breakpoint()
        ##SUC / 0
    @classmethod
    def tearDownClass(cls):
        print("TC.tearDownClass", cls)
        y = unittest.case._AutoDelRunner(lambda: print("-- delframe TDC"))
        TDC / 0
        print("TC.tearDownClassB", cls)

    def test_0(self):
        print("hello 0")
    def test_1(self):
        print("hello 1")
        self.assertTrue(0)
    def test_2(self):
        print("hello 2")
        2 / 0
    def test_3(self):
        print("hello 3")
        with self.subTest():
            3 / 0  # subTest
        print("hello 3B")

def tearDownModule():
        print("testdbg.tearDownModule")
        ##TDM / 0

x = unittest.case._AutoDelRunner(lambda: print("Del X"))

def clear_sysltb():
    print("clear_sysltb", sys.last_traceback, sys.last_value)
    sys.last_traceback = sys.last_value = sys.last_type = None
    ##gc.collect()
    print("clear_sysltb_EXIT", sys.last_traceback, sys.last_value)

if __name__ == "__main__":
    import atexit
    atexit.register(clear_sysltb)
    sys.stderr = sys.stdout  # to work synchronously w/o '-u' in piped run
    unittest.main()