How to use the etlhelper.exceptions.ETLHelperDbParamsError function in etlhelper

def test_db_params_from_environment_not_set(monkeypatch):
    """
    Test missing db params from environment settings.
    """
    # Arrange
    monkeypatch.delenv('TEST_DBTYPE', raising=False)

    # Act
    with pytest.raises(ETLHelperDbParamsError,
                       match=r".*environment variable is not set.*"):
        DbParams.from_environment(prefix='TEST_')

def test_db_params_validate_params():
    with pytest.raises(ETLHelperDbParamsError, match=r'.* not in valid types .*'):
        DbParams(dbtype='not valid')

def from_environment(cls, prefix='ETLHelper_'):
        """
        Create DbParams object from parameters specified by environment
        variables e.g. ETLHelper_dbtype, ETLHelper_host, ETLHelper_port, etc.
        :param prefix: str, prefix to environment variable names
        """
        dbparams_keys = [key for key in os.environ if key.startswith(prefix)]
        dbparams_from_env = {key.replace(prefix, '').lower(): os.environ[key]
                             for key in dbparams_keys}

        # Ensure dbtype has been set
        dbtype_var = f'{prefix}dbtype'
        if 'dbtype' not in dbparams_from_env:
            msg = f"{dbtype_var} environment variable is not set"
            raise ETLHelperDbParamsError(msg)

        return cls(**dbparams_from_env)

:raises ETLHelperParamsError: Error if params are invalid
        """
        # Get a set of the attributes to compare against required attributes.
        given = set(self.keys())

        try:
            required_params = DB_HELPER_FACTORY.from_dbtype(self.dbtype).required_params
        except ETLHelperHelperError:
            msg = f'{self.dbtype} not in valid types ({DB_HELPER_FACTORY.helpers.keys()})'
            raise ETLHelperDbParamsError(msg)

        unset_params = (given ^ required_params) & required_params
        if unset_params:
            msg = f'{unset_params} not set. Required parameters are {required_params}'
            raise ETLHelperDbParamsError(msg)