### Question:
MavenModelMerger extends ModelMerger { @Override protected void mergeModel_ModelVersion( Model target, Model source, boolean sourceDominant, Map<Object, Object> context ) { }   static final String CHILD_PATH_ADJUSTMENT; static final String ARTIFACT_ID; }### Answer:
@Test public void testMergeModel_ModelVersion() { Model parent = new Model(); parent.setModelVersion( "4.0.0" ); Model model = new Model(); modelMerger.mergeModel_ModelVersion( model, parent, false, null ); assertNull( model.getModelVersion() ); model.setModelVersion( "5.0.0" ); modelMerger.mergeModel_ModelVersion( model, parent, false, null ); assertEquals( "5.0.0", model.getModelVersion() ); }