How to use the stm32pio.settings.config_file_name function in stm32pio

[test_section]
            key1 = value1
            key2 = 789
        ''')
        cli_parameter_user_value = 'nucleo_f429zi'

        # Create test config
        config = configparser.ConfigParser(interpolation=None)
        config.read_dict({
            'project': {
                'platformio_ini_patch_content': config_parameter_user_value,
                'board': TEST_PROJECT_BOARD
            }
        })
        # ... save it
        with FIXTURE_PATH.joinpath(stm32pio.settings.config_file_name).open(mode='w') as config_file:
            config.write(config_file)

        # On project creation we should interpret the CLI-provided values as superseding to the saved ones and
        # saved ones, in turn, as superseding to the default ones
        project = stm32pio.lib.Stm32pio(FIXTURE_PATH, parameters={'project': {'board': cli_parameter_user_value}})
        project.pio_init()
        project.patch()

        # Actually, we can parse the platformio.ini via the configparser but this is simpler in our case
        after_patch_content = FIXTURE_PATH.joinpath('platformio.ini').read_text()
        self.assertIn(config_parameter_user_value, after_patch_content,
                      msg="User config parameter has not been prioritized over the default one")
        self.assertIn(cli_parameter_user_value, after_patch_content,
                      msg="User CLI parameter has not been prioritized over the saved one")

def test_init(self):
        """
        Check for config creation and parameters presence
        """
        result = subprocess.run([PYTHON_EXEC, STM32PIO_MAIN_SCRIPT, 'init', '-d', str(FIXTURE_PATH),
                                 '-b', TEST_PROJECT_BOARD], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        self.assertEqual(result.returncode, 0, msg="Non-zero return code")

        self.assertTrue(FIXTURE_PATH.joinpath(stm32pio.settings.config_file_name).is_file(),
                        msg=f"{stm32pio.settings.config_file_name} file hasn't been created")

        config = configparser.ConfigParser(interpolation=None)
        config.read(str(FIXTURE_PATH.joinpath(stm32pio.settings.config_file_name)))
        for section, parameters in stm32pio.settings.config_default.items():
            for option, value in parameters.items():
                with self.subTest(section=section, option=option, msg="Section/key is not found in saved config file"):
                    self.assertIsNotNone(config.get(section, option, fallback=None))
        self.assertEqual(config.get('project', 'board', fallback="Not found"), TEST_PROJECT_BOARD,
                         msg="'board' has not been set")

def test_init(self):
        """
        Check for config creation and parameters presence
        """
        result = subprocess.run([PYTHON_EXEC, STM32PIO_MAIN_SCRIPT, 'init', '-d', str(FIXTURE_PATH),
                                 '-b', TEST_PROJECT_BOARD], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
        self.assertEqual(result.returncode, 0, msg="Non-zero return code")

        self.assertTrue(FIXTURE_PATH.joinpath(stm32pio.settings.config_file_name).is_file(),
                        msg=f"{stm32pio.settings.config_file_name} file hasn't been created")

        config = configparser.ConfigParser(interpolation=None)
        config.read(str(FIXTURE_PATH.joinpath(stm32pio.settings.config_file_name)))
        for section, parameters in stm32pio.settings.config_default.items():
            for option, value in parameters.items():
                with self.subTest(section=section, option=option, msg="Section/key is not found in saved config file"):
                    self.assertIsNotNone(config.get(section, option, fallback=None))
        self.assertEqual(config.get('project', 'board', fallback="Not found"), TEST_PROJECT_BOARD,
                         msg="'board' has not been set")

def test_save_config(self):
        """
        Explicitly save the config to file and look did that actually happen and whether all the information was
        preserved
        """
        # 'board' is non-default, 'project'-section parameter
        project = stm32pio.lib.Stm32pio(FIXTURE_PATH, parameters={'project': {'board': TEST_PROJECT_BOARD}})
        project.save_config()

        self.assertTrue(FIXTURE_PATH.joinpath(stm32pio.settings.config_file_name).is_file(),
                        msg=f"{stm32pio.settings.config_file_name} file hasn't been created")

        config = configparser.ConfigParser(interpolation=None)
        self.assertGreater(len(config.read(str(FIXTURE_PATH.joinpath(stm32pio.settings.config_file_name)))), 0,
                           msg="Config is empty")
        for section, parameters in stm32pio.settings.config_default.items():
            for option, value in parameters.items():
                with self.subTest(section=section, option=option,
                                  msg="Section/key is not found in the saved config file"):
                    self.assertNotEqual(config.get(section, option, fallback="Not found"), "Not found")

        self.assertEqual(config.get('project', 'board', fallback="Not found"), TEST_PROJECT_BOARD,
                         msg="'board' has not been set")

def test_save_config(self):
        """
        Explicitly save the config to file and look did that actually happen and whether all the information was
        preserved
        """
        # 'board' is non-default, 'project'-section parameter
        project = stm32pio.lib.Stm32pio(FIXTURE_PATH, parameters={'project': {'board': TEST_PROJECT_BOARD}})
        project.save_config()

        self.assertTrue(FIXTURE_PATH.joinpath(stm32pio.settings.config_file_name).is_file(),
                        msg=f"{stm32pio.settings.config_file_name} file hasn't been created")

        config = configparser.ConfigParser(interpolation=None)
        self.assertGreater(len(config.read(str(FIXTURE_PATH.joinpath(stm32pio.settings.config_file_name)))), 0,
                           msg="Config is empty")
        for section, parameters in stm32pio.settings.config_default.items():
            for option, value in parameters.items():
                with self.subTest(section=section, option=option,
                                  msg="Section/key is not found in the saved config file"):
                    self.assertNotEqual(config.get(section, option, fallback="Not found"), "Not found")

        self.assertEqual(config.get('project', 'board', fallback="Not found"), TEST_PROJECT_BOARD,
                         msg="'board' has not been set")

def _save_config(config: configparser.ConfigParser, path: pathlib.Path, logger: logging.Logger) -> int:
        """
        Writes the ConfigParser 'config' to the file 'path' and logs using the Logger 'logger'.

        We declare this helper function which can be safely invoked by both internal methods and outer code. The latter
        case is suitable for using in weakref' finalizer objects as one of its main requirement is to not keep
        references to the destroyable object in any of the finalizer argument so the ordinary bound class method does
        not fit well.

        Returns:
            0 on success, -1 otherwise
        """
        try:
            with path.joinpath(stm32pio.settings.config_file_name).open(mode='w') as config_file:
                config.write(config_file)
            logger.debug(f"{stm32pio.settings.config_file_name} config file has been saved")
            return 0
        except Exception as e:
            logger.warning(f"cannot save the config: {e}", exc_info=logger.isEnabledFor(logging.DEBUG))
            return -1

def _save_config(config: configparser.ConfigParser, path: pathlib.Path, logger: logging.Logger) -> int:
        """
        Writes the ConfigParser 'config' to the file 'path' and logs using the Logger 'logger'.

        We declare this helper function which can be safely invoked by both internal methods and outer code. The latter
        case is suitable for using in weakref' finalizer objects as one of its main requirement is to not keep
        references to the destroyable object in any of the finalizer argument so the ordinary bound class method does
        not fit well.

        Returns:
            0 on success, -1 otherwise
        """
        try:
            with path.joinpath(stm32pio.settings.config_file_name).open(mode='w') as config_file:
                config.write(config_file)
            logger.debug(f"{stm32pio.settings.config_file_name} config file has been saved")
            return 0
        except Exception as e:
            logger.warning(f"cannot save the config: {e}", exc_info=logger.isEnabledFor(logging.DEBUG))
            return -1