@BeforeClass
  public static void setUp() throws Exception {
    MacConfig.register();
    AesCmacProtoSerialization.register();
    HmacProtoSerialization.register();
    ChunkedMacWrapper.register();
    createTestKeys();
  }
These tests ensure interoperability between the new ChunkedMac implementations and the old Mac
implementations.
java_src/src/test/java/com/google/crypto/tink/mac/ChunkedMacTest.java