Model.Builder builder = Model.newBuilder(model);
        modelMerger.mergeModel_ArtifactId(builder, model, parent, false, null);
        assertNull(model.getArtifactId());

        model = Model.newBuilder().artifactId("MODEL").build();
        builder = Model.newBuilder(model);
        modelMerger.mergeModel_ArtifactId(builder, model, parent, false, null);
        assertEquals("MODEL", builder.build().getArtifactId());

            Model.Builder builder, Model target, Model source, boolean sourceDominant, Map<Object, Object> context) {
        // neither inherited nor injected
    }

    @Override
    protected void mergeModel_ArtifactId(
            Model.Builder builder, Model target, Model source, boolean sourceDominant, Map<Object, Object> context) {
        // neither inherited nor injected
    }

    @Override