((TableAnswerElement) answer) .getRowsList().stream() .map(row -> row.getFlow(TracerouteAnswerer.COL_FLOW)) .collect(Collectors.toSet()); assertThat(flows, not(empty())); ((TableAnswerElement) answer) .getRowsList().stream() .map(row -> row.getFlow(TracerouteAnswerer.COL_FLOW)) .collect(Collectors.toSet()); assertThat(flows, not(empty()));