privatestaticclassOnePointCursorextendsGeometryCursor {privatebooleanflag =true;OnePointCursor() {}publicGeometrynext() {if (flag) {flag =false;returnnewPoint(1.2,3.4);      }elsereturnnull;    }publicintgetGeometryID() {thrownewUnsupportedOperationException();    }  }@TestpublicstaticvoidtestOnePoint() {GeometryCursorgeomCursor =newOnePointCursor();GeometryCursorconvexResult =OperatorConvexHull.local().execute(geomCursor,true,null);Geometryresult =convexResult.next();System.err.println(result);// {"rings":[]}assertFalse(result.isEmpty());// junit.framework.AssertionFailedError  }