@Test
  public void testWrap_wrapAsEncryptOnly() throws Exception {
    // Check that Registry.wrap can be assigned to an EncryptOnly (as there's a suppress warning).
    EncryptOnly encrypt = Registry.wrap(createAeadPrimitiveSet(), EncryptOnly.class);
    assertThat(encrypt).isNotNull();
  }
Returns the type URL that identifies the key type of keys managed by this KeyManager.
java_src/src/test/java/com/google/crypto/tink/RegistryTest.java