public String summarize(final ExecutionStep<?> step) {
    return summarize(step, "").summary;
  }
@Test
  public void shouldSummarizeSource() {
    // When:
    final String summary = planSummaryBuilder.summarize(sourceStep);

    // Then:
    assertThat(summary, is(
        " > [ SOURCE ] | Schema: ROWKEY STRING KEY, L0 INTEGER | Logger: QID.src\n"
    ));
  }