MavenProject project = new MavenProject( model, repositorySystem );

        project.setArtifacts( project.createArtifacts( null ) );

        String key = ArtifactUtils.versionlessKey( groupId, artifactId );

        Map artifactMap = project.getArtifactMap();

        assertNotNull( artifactMap, "artifact-map should not be null." );

        assertNotNull(depResults);
        assertEquals(1, depResults.size());
        assertSame(
                depArtifact,
                depResults.get(ArtifactUtils.versionlessKey(depArtifact)),
                "dependency artifact is wrong.");
    }

    @Test
    void testPluginArtifactIdExpressionReference() throws Exception {
        MojoExecution exec = newMojoExecution();