@Before
  public void setUp() throws Exception {
    GcpKmsClient.register(Optional.empty(), Optional.of(GCP_CREDENTIALS_FILE));
    AeadConfig.register();
  }
Integration tests for Tink's GcpKmsClient with the real GCP Cloud KMS.
java_src/src/test/java/com/google/crypto/tink/integration/gcpkms/GcpKmsIntegrationTest.java