### Question:
S3Repository extends AbstractRepository { S3Repository( S3Client client, String name, String bucket, String prefix, String artifactId, String modelName) { this.client = client; this.name = name; this.bucket = bucket; this.prefix = prefix; this.artifactId = artifactId; this.modelName = modelName; } S3Repository(
            S3Client client,
            String name,
            String bucket,
            String prefix,
            String artifactId,
            String modelName); @Override boolean isRemote(); @Override String getName(); @Override URI getBaseUri(); @Override Metadata locate(MRL mrl); @Override Artifact resolve(MRL mrl, String version, Map<String, String> filter); @Override List<MRL> getResources();  }### Answer:
@Test public void testS3Repository() throws IOException { S3Client client = S3Client.builder() .credentialsProvider(AnonymousCredentialsProvider.create()) .region(Region.US_EAST_1) .build(); Repository.registerRepositoryFactory(new S3RepositoryFactory(client)); Repository repository = Repository.newInstance( "s3", "s3: Assert.assertTrue(repository.isRemote()); URI url = repository.getBaseUri(); Assert.assertEquals( url.toString(), "mlrepo/model/cv/image_classification/ai/djl/mxnet/mlp/0.0.1/"); MRL mrl = MRL.model(Application.UNDEFINED, "ai.djl.localmodelzoo", "mlp"); Artifact artifact = repository.resolve(mrl, "0.0.1", null); Assert.assertNotNull(artifact); repository = Repository.newInstance("s3", "s3: artifact = repository.resolve(mrl, "0.0.1", null); Assert.assertNull(artifact); }