### Question:
SFTPPut extends BaseStep implements StepInterface { @VisibleForTesting void checkRemoteFoldernameField( String remoteFoldernameFieldName, SFTPPutData data ) throws KettleStepException { remoteFoldernameFieldName = environmentSubstitute( remoteFoldernameFieldName ); if ( Utils.isEmpty( remoteFoldernameFieldName ) ) { throw new KettleStepException( BaseMessages.getString( PKG, "SFTPPut.Error.RemoteFolderNameFieldMissing" ) ); } data.indexOfRemoteDirectory = getInputRowMeta().indexOfValue( remoteFoldernameFieldName ); if ( data.indexOfRemoteDirectory == -1 ) { throw new KettleStepException( BaseMessages.getString( PKG, "SFTPPut.Error.CanNotFindField", remoteFoldernameFieldName ) ); } } SFTPPut( StepMeta stepMeta, StepDataInterface stepDataInterface, int copyNr, TransMeta transMeta,
    Trans trans ); boolean processRow( StepMetaInterface smi, StepDataInterface sdi ); void dispose( StepMetaInterface smi, StepDataInterface sdi );  }### Answer:
@Test( expected = KettleStepException.class ) public void checkRemoteFoldernameField_NameIsBlank() throws Exception { SFTPPutData data = new SFTPPutData(); step.checkRemoteFoldernameField( "", data ); }
@Test( expected = KettleStepException.class ) public void checkRemoteFoldernameField_NameIsSet_NotFound() throws Exception { step.setInputRowMeta( new RowMeta() ); step.checkRemoteFoldernameField( "remoteFolder", new SFTPPutData() ); }
@Test public void checkRemoteFoldernameField_NameIsSet_Found() throws Exception { RowMeta rowMeta = rowOfStringsMeta( "some field", "remoteFoldernameFieldName" ); step.setInputRowMeta( rowMeta ); SFTPPutData data = new SFTPPutData(); step.checkRemoteFoldernameField( "remoteFoldernameFieldName", data ); assertEquals( 1, data.indexOfRemoteDirectory ); }