public List<StepMeta> findPreviousSteps( StepMeta stepMeta ) {
    return findPreviousSteps( stepMeta, true );
  }
@Test
  public void findPreviousStepsNullMeta( ) {
    TransMeta transMeta = new TransMeta( new Variables() );
    List<StepMeta> result = transMeta.findPreviousSteps( null, false );

    assertThat( 0, equalTo( result.size() ) );
    assertThat( result, equalTo( new ArrayList<>() ) );
  }