@Test
    void testFileSource() {
        NullPointerException e = assertThrows(
                NullPointerException.class,
                () -> new FileSource((File) null),
                "Should fail, since you must specify a file");
        assertEquals("file cannot be null", e.getMessage());
    }

    @Test
    void testGetInputStream() throws Exception {

     * verify the path and resolve the artifact if the path actually denotes an existing file. If the path isn't valid,
     * resolution will fail and no attempts to search local/remote repositories are made.
     */
    public static final String LOCAL_PATH = "localPath";

    private MavenArtifactProperties() {
        // hide constructor
    }

     * @return the default value
     */
    @Nonnull
    String defaultValue() default "";

    /**
     * is the parameter required?
     * @return <code>true</code> if the Mojo should fail when the parameter cannot be injected
     */
    boolean required() default false;

    /**
     * Specifies that this parameter cannot be configured directly by the user (as in the case of POM-specified

import java.util.Set;
import java.util.function.Predicate;

import static java.util.stream.Collectors.toSet;

/**
 * Container for storing the request from the user to activate or de-activate certain profiles and optionally fail the
 * build if those profiles do not exist.
 */
public class ProfileActivation {
    private final Map<String, ActivationSettings> activations = new HashMap<>();

    /**

    public boolean isSnapshot() {
        return parent.isSnapshot();
    }

    public void addMetadata(ArtifactMetadata metadata) {
        // ignore. The parent artifact will handle metadata.
        // we must fail silently here to avoid problems with the artifact transformers.
    }

    public Collection<ArtifactMetadata> getMetadataList() {
        return Collections.emptyList();
    }

        projects.add(project2);

        assertThrows(
                DuplicateProjectException.class,
                () -> new ProjectSorter(projects).getSortedProjects(),
                "Duplicate projects should fail");
    }

    @Test
    void testMatchingIdsAndDifferentVersions() throws Exception {
        List<MavenProject> projects = new ArrayList<>();

        legacySupport.setSession(session);
    }

    protected abstract String component();

    /**
     * Return an existing file, not a directory - causes creation to fail.
     *
     * @throws Exception
     */
    protected ArtifactRepository badLocalRepository() throws Exception {
        String path = "target/test-repositories/" + component() + "/bad-local-repository";

        return sb.toString();
    }

    public Artifact find(Artifact artifact) {
        File artifactFile = new File(getBasedir(), pathOf(artifact));

        // We need to set the file here or the resolver will fail with an NPE, not fully equipped to deal
        // with multiple local repository implementations yet.
        artifact.setFile(artifactFile);

        return artifact;
    }

    }

    public static String toRepositoryChecksumPolicy(final String artifactRepositoryPolicy) {
        switch (artifactRepositoryPolicy) {
            case RepositoryPolicy.CHECKSUM_POLICY_FAIL:
                return RepositoryPolicy.CHECKSUM_POLICY_FAIL;
            case RepositoryPolicy.CHECKSUM_POLICY_IGNORE:
                return RepositoryPolicy.CHECKSUM_POLICY_IGNORE;
            case RepositoryPolicy.CHECKSUM_POLICY_WARN:

    void testChecksumVerification() throws Exception {
        ArtifactRepositoryPolicy policy = new ArtifactRepositoryPolicy(
                true, ArtifactRepositoryPolicy.UPDATE_POLICY_ALWAYS, ArtifactRepositoryPolicy.CHECKSUM_POLICY_FAIL);

        ArtifactRepository repo = artifactRepositoryFactory.createArtifactRepository(
                "id", "string://url", new ArtifactRepositoryLayoutStub(), policy, policy);