def METHOD_NAME(bsrn_credentials):
    username, password = bsrn_credentials
    # Test if Warning is given if no files are found for the entire time frame
    with pytest.warns(UserWarning, match='No files'):
        get_bsrn(
            start=pd.Timestamp(1990, 6, 1),
            end=pd.Timestamp(1990, 6, 29),
            station='tam',
            username=username,
            password=password)