@Override
    public TestPrimitiveB wrap(final PrimitiveSet<TestPrimitiveA> primitives) {
      return new TestPrimitiveB();
    }
Tests that key parsing via the serialization registry works as expected.

<p>NOTE: This adds a parser to the MutableSerializationRegistry, which no other test uses.
java_src/src/test/java/com/google/crypto/tink/KeysetHandleTest.java