The python's unittest library executes the tests in alphabetical order to override this behaviour and execute tests in (defined) order. Use `unittest.main(testLoader=SequentialTestCaseLoader())` to trigger execution.

sequential_testcase_loader.py

import unittest

class SequentialTestCaseLoader(unittest.TestLoader):
    """
    The python's unittest library executes the tests in alphabetical order 
    to override this behaviour and execute tests in (defined) order. 
    Use `unittest.main(testLoader=SequentialTestCaseLoader())` to 
    the trigger execution.
    """
    def getTestCaseNames(self, tcCls):
        tcnames = super().getTestCaseNames(tcCls)
        tc_mtds = list(tcCls.__dict__.keys())
        tcnames.sort(key=tc_mtds.index)
        return tcnames