How to use the covimerage.exceptions.CoverageWrapperException function in covimerage

def source(self):
        try:
            with open(self.filename, 'rb') as f:
                source = f.read()
                try:
                    return source.decode('utf8')
                except UnicodeDecodeError:
                    logger.debug('UnicodeDecodeError in %s for utf8. '
                                 'Trying iso-8859-15.', self.filename)
                    return source.decode('iso-8859-15')
        except FileNotFoundError as exc:
            logger.warning('%s', exc)
            raise coverage.misc.NoSource(str(exc))
        except Exception as exc:
            raise CoverageWrapperException(
                'Could not read source for %s.' % self.filename, orig_exc=exc)

fname, fobj, fstr = get_fname_and_fobj_and_str(self.data_file)
            try:
                if fobj:
                    try:
                        read_fileobj = cov_data.read_fileobj
                    except AttributeError:  # made private in coveragepy 5
                        read_fileobj = cov_data._read_fileobj
                    read_fileobj(fobj)
                else:
                    try:
                        read_file = cov_data.read_file
                    except AttributeError:  # made private in coveragepy 5
                        read_file = cov_data._read_file
                    read_file(fname)
            except coverage.CoverageException as exc:
                raise CoverageWrapperException(
                    'Coverage could not read data_file: %s' % fstr,
                    orig_exc=exc)
        object.__setattr__(self, 'cov_data', cov_data)

def format_message(self):
        """Append information about original exception if any."""
        msg = super(CoverageWrapperException, self).format_message()
        if self.orig_exc:
            return '%s (%s: %s)' % (
                msg,
                self.orig_exc.__class__.__name__,
                self.orig_exc)
        return msg

def wrapper(*args, **kwargs):
        try:
            return f(*args, **kwargs)
        except coverage.CoverageException as exc:
            raise CoverageWrapperException('%s (%s)' % (
                exc, exc.__class__.__name__))
    return wrapper