* test code for a group multipolygon test files which
* represent the same case with different multipolygon variants
*/
private void genericMultipolygonTest(String filename) throws IOException {
MapData mapData = loadMapData(filename);
assertSame(13, mapData.getMapNodes().size());
assertSame(0, mapData.getMapWaySegments().size());
assertSame(1, mapData.getMapAreas().size());
MapArea area = mapData.getMapAreas().iterator().next();
assertSame(2, area.getHoles().size());
assertSame(6, area.getOuterPolygon().size());
assertSame(13, area.getAreaSegments().size());