@Override
    public void setUp() throws Exception {
        super.setUp();
        mapper = getMapper("mappings/mapidsameinstance.xml");

        one = new One();
        two = createTwo();
    }
Regression-tests to ensure that mapid is respected even when
the same instance is mapped.

@see <a href="https://github.com/DozerMapper/dozer/issues/238">MappedFieldsTracker does not consider map-id 238</a>
core/src/test/java/com/github/dozermapper/core/functional_tests/MapIdSameInstanceTest.java