@Test
public void testExec_Paris_London() {

    NodeValue v1 = SpatialIndexTestData.PARIS_GEOMETRY_WRAPPER.asNodeValue();
    NodeValue v2 = SpatialIndexTestData.LONDON_GEOMETRY_WRAPPER.asNodeValue();
    NodeValue v3 = NodeValue.makeString(Unit_URI.KILOMETER_URL);
    DistanceFF instance = new DistanceFF();
    double expResult = 343.7713;
    double result = instance.exec(v1, v2, v3).getDouble();
    assertEquals(expResult, result, 0.0001);
}