@Test
public void testExec_OSGB() {

    NodeValue v1 = NodeValue.makeNode("<http://www.opengis.net/def/crs/EPSG/0/27700> POINT(0.0 0.0)", WKTDatatype.INSTANCE);
    NodeValue v2 = NodeValue.makeNode("<http://www.opengis.net/def/crs/EPSG/0/27700> POINT(10000.0 0.0)", WKTDatatype.INSTANCE);
    NodeValue v3 = NodeValue.makeString(Unit_URI.KILOMETER_URL);
    DistanceFF instance = new DistanceFF();
    double expResult = 10;
    double result = instance.exec(v1, v2, v3).getDouble();
    assertEquals(expResult, result, 0.0001);
}