String pathB = TestUtils.DATA_DIR + "seg/toCombine_b.seg";
SegmentedDataSet dsA = getSegDataSet(pathA);
SegmentedDataSet dsB = getSegDataSet(pathB);
SegmentedDataSource sourceA = new SegmentedDataSource("0123-A", dsA);
SegmentedDataSource sourceB = new SegmentedDataSource("0123-B-1", dsB);
DataSourceTrack trackA = new DataSourceTrack(null, sourceA.getTrackIdentifier(), sourceA.getTrackIdentifier(), sourceA);
DataSourceTrack trackB = new DataSourceTrack(null, sourceB.getTrackIdentifier(), sourceB.getTrackIdentifier(), sourceB);
return new CombinedDataSource(trackA, trackB, operation);
}