@Test(expected = ExprEvalException.class)
public void testExec_pos0_fail() {

    NodeValue v1 = NodeValue.makeString("e");
    NodeValue v2 = NodeValue.makeFloat(20.0f);
    ConvertLatLonFF instance = new ConvertLatLonFF();
    NodeValue expResult = NodeValue.makeNode("<http://www.opengis.net/def/crs/EPSG/0/4326> POINT(10.0 20.0)", WKTDatatype.INSTANCE);
    NodeValue result = instance.exec(v1, v2);
    //assertEquals(expResult, result);
}