assertEquals("1000", project.getVersion(), "version proto-inheritance failed.");

        // draw the NPE.
        project.getId();
    }

    @Test
    void testEmptyConstructor() {
        MavenProject project = new MavenProject();

        assertEquals(
                MavenProject.EMPTY_PROJECT_GROUP_ID + ":" + MavenProject.EMPTY_PROJECT_ARTIFACT_ID + ":jar:"