Finalizes the command's options.

        Args:
          self (CoverageCommand): the ``CoverageCommand`` instance

        Returns:
          ``None``

def finalize_options(self):
        """Finalizes the command's options.

        Args:
          self (CoverageCommand): the ``CoverageCommand`` instance

        Returns:
          ``None``
        """
        self.cwd = os.path.abspath(os.path.dirname(__file__))
        self.test_dir = os.path.join(self.cwd, 'tests')