@Test
public void testGetParameterValues() {

    ParameterValueGroup pvg = transform.getParameterValues();
    
    // Descriptor is the same as provider's
    assertEquals(pvg.getDescriptor(), NTv2Transform.Provider.PARAMETERS);
    // One single value
    assertEquals(pvg.values().size(), 1);
    
    // Value accessible through its identifiers
    Object value = pvg.parameter("8656").getValue();
    assertTrue(value instanceof URI);
    assertEquals(value.toString(), TEST_GRID);
    value = pvg.parameter("Latitude and longitude difference file").getValue();
    assertTrue(value instanceof URI);
    assertEquals(value.toString(), TEST_GRID);
}