Object Code Deployment - Writing Move Unit tests

[kshitijc1506]

Discord user ID

kc1506

Describe your question in detail.

Context

I'm using object code deployment. In essence, we deploy our packages to an object instead of a regular account or resource account. The owner of the "code object" has the ability to upgrade the modules in the package.

I'm writing a rewards module, in which I have a function transfer_admin_role.

/// Transfer the code object to a new admin address and change the admin field in RewardsStore. 
    public entry fun transfer_admin_role(admin: &signer, code_object: Object<PackageRegistry>, new_admin: address) acquires RewardStore {
        assert_is_admin(signer::address_of(admin));
        object::transfer(admin, code_object, new_admin);
        let rewards_store = borrow_global_mut<RewardStore>(@rewards);
        rewards_store.admin = new_admin;
    }

I want to write unit tests for this function. In particular, I want to simulate publishing the package, using the event emitted obtain the address of the object. And then convert that address to an instance of the code object and pass that through the transfer_admin_role function in my unit test. Here's some incomplete code to help understand:

fun test_e2e(admin: &signer, claimer_1: &signer, claimer_2: &signer, admin_2: &signer) {
...

  // Prepare the code object metadata and the code modules
  let metadata = PackageMetadata {
      name: ,
      upgrade_policy: ,
      upgrade_number: ,
      source_digest: ,
      manifest: ,
      modules: ,
      deps: ,
      extension: ,
  }
  let metadata_serialized = bcs::to_bytes(&metadata):
  let rewards_code = ;
  
  // Publish the code object with the admin account as owner to simulate publishing package
  object_code_deployment::publish(admin, metadata_serialized, rewards_code);
  let emitted_event = event::emitted_events<Publish>();
  let code_object_addr = emitted_event[0].code_object_addr;
  
  let code_object = object::address_to_object(code_object_addr);
  
  ...
  
  rewards::transfer_admin_role(admin, code_object_addr, admin_2_addr)

My Questions

1. Is there code anyone can point me towards so I can refer to so I can see how PackageMetadata is prepared? Move/Rust/Typescript is fine, anything is helpful. Apparently there are no Move examples calling the object_code_deployment::publish function.
2. It seems like I'd need to take the bytecode from the module and convert to vector<vector<u8>> ? Is there any recommended way to do this?

I don't know if this should be prepared on-chain (most likely not), but I'm not sure how else to test the function.

What error, if any, are you getting?

No response

What have you tried or looked at? Or how can we reproduce the error?

N/A

Which operating system are you using?

macOS

Which SDK or tool are you using? (if any)

N/A

Describe your environment or tooling in detail

Visual Studio Code