# PR-1.7 — Bytecode Roundtrip Tests (Encode/Decode/Disasm Sanity)

### Briefing

Before touching VM behavior, we want confidence that the bytecode toolchain is coherent after the ISA reset.

### Target

* Add roundtrip tests that validate:

    * Encode → decode preserves structure.
    * Disasm prints stable, readable output.

### Work items

* Add a small set of “known-good” bytecode samples built using the new minimal ISA.
* Implement tests:

    * Encode then decode equals original structure.
    * Disasm output contains expected instruction names and operands.
* Keep samples intentionally tiny and deterministic.

### Acceptance checklist

* [ ] Roundtrip tests exist and pass.
* [ ] Samples do not depend on legacy semantics.
* [ ] `cargo test` passes.

### Tests

* New unit tests for encode/decode/disasm roundtrip.