def METHOD_NAME(mocked_erddapserver, this_fetcher, cacheable=False):
    """Assert a data fetcher.
        This should be used by all tests
    """
    assert isinstance(this_fetcher.to_dataframe(), pd.core.frame.DataFrame)
    assert (this_fetcher.N_RECORDS >= 1)  # Make sure we loaded the index file content
    assert (this_fetcher.N_FILES >= 1)  # Make sure we found results
    if cacheable:
        assert is_list_of_strings(this_fetcher.cachepath)