public String summarize(final ExecutionStep<?> step) {
    return summarize(step, "").summary;
  }
@Test
  public void shouldThrowOnUnsupportedStepType() {
    // Given:
    final ExecutionStep<?> step = mock(ExecutionStep.class);

    // When:
    assertThrows(
        UnsupportedOperationException.class,
        () -> planSummaryBuilder.summarize(step)
    );
  }