private static TestParameters1 parseParametersAlwaysThrows(
      ProtoParametersSerialization serialization) throws GeneralSecurityException {
    throw new GeneralSecurityException("Always throws");
  }
Tests for {@link MutableSerializationRegistry}.

<p>We repeat the main tests in SerializationRegistryTest. There really shouldn't be both classes,
but currently this is what we need, and the other is what we should have.
java_src/src/test/java/com/google/crypto/tink/internal/MutableSerializationRegistryTest.java