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

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

        assertEquals(
                MavenProject.EMPTY_PROJECT_GROUP_ID + ":" + MavenProject.EMPTY_PROJECT_ARTIFACT_ID + ":jar:"
                        + MavenProject.EMPTY_PROJECT_VERSION,
                project.getId());
    }

    @Test

            }
        }
        return projectLocalRepository;
    }

    private MavenProject getProject(Artifact artifact) {
        return getProject(artifact, getProjects());
    }

    private MavenProject getProject(Artifact artifact, Map<String, Map<String, Map<String, MavenProject>>> projects) {
        return projects.getOrDefault(artifact.getGroupId(), Collections.emptyMap())

        return project;
    }

    private MavenProject getMavenProject(String artifactId) {
        MavenProject mavenProject = new MavenProject();
        mavenProject.setGroupId(GROUP_ID);
        mavenProject.setArtifactId(artifactId);
        mavenProject.setVersion("1.0");
        mavenProject.setPomFile(new File(artifactId, "pom.xml"));
        mavenProject.setCollectedProjects(new ArrayList<>());

        InternalMavenSession session = Mockito.mock(InternalMavenSession.class);
        ArtifactManager artifactManager = Mockito.mock(ArtifactManager.class);
        MavenProject mavenProject = new MavenProject();
        project = new DefaultProject(session, mavenProject);
        artifact = Mockito.mock(ProducedArtifact.class);
        artifactPath = Paths.get("");
        DefaultVersionParser versionParser =

        MavenProject prj = getMavenProject(requireNonNull(project, "project" + " cannot be null"));
        return prj.getSourceRoots();
    }

    @Nonnull
    @Override
    public Stream<SourceRoot> getEnabledSourceRoots(@Nonnull Project project, ProjectScope scope, Language language) {
        MavenProject prj = getMavenProject(requireNonNull(project, "project" + " cannot be null"));

import org.apache.maven.plugin.version.PluginVersionResolver;
import org.apache.maven.project.ExtensionDescriptor;
import org.apache.maven.project.ExtensionDescriptorBuilder;
import org.apache.maven.project.MavenProject;
import org.apache.maven.session.scope.internal.SessionScope;
import org.apache.maven.session.scope.internal.SessionScopeModule;
import org.codehaus.plexus.DefaultPlexusContainer;