Abort following tests if one failed.

pyUnittest_Testcase.py

class SomeTestcases(TestCase):
	_continueTesting = True

	def setUp(self) -> None:
		"""Check for every test, if tests should continue."""
		if not self.__class__._continueTesting:
			self.skipTest("No reason to go on.")

	def fail(self, msg: Any = ...) -> NoReturn:
		self.__class__._continueTesting = False
		super().fail(msg)

  def test_Init(self) -> None:
    # ...
    
    if condition:
      self.fail("this is why")