@Test
public void removeFactMapping() {

    FactMapping retrieved = scesimModelDescriptor.addFactMapping(factIdentifier, expressionIdentifier);
    assertTrue(scesimModelDescriptor.getUnmodifiableFactMappings().contains(retrieved));
    scesimModelDescriptor.removeFactMapping(retrieved);
    assertFalse(scesimModelDescriptor.getUnmodifiableFactMappings().contains(retrieved));
}