---
title: "mlab-tests-vm — Mova code model"
description: "Mova code model of mlab/tests/vm.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/mlab/tests/vm.rs.groupant/"
---
Elamur: [Mova](https://md.mova.elamur.ai/free/en/) · [Dictionary](https://md.dictionary.elamur.ai/free/en/) · [Research](https://md.research.elamur.ai/free/en/) · **Groupants**

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# mlab-tests-vm

The groupant beside mlab/tests/vm.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.

## Facts

- **kind:** groupant
- **status:** partial source bound model
- **source:** [`mlab/tests/vm.rs`](https://github.com/ElamurAI/mova-free/blob/main/mlab/tests/vm.rs)
- **source SHA-256:** `752cb721b2bda77e…`
- **repository folder:** [`mlab/tests/vm.rs.groupant`](https://github.com/ElamurAI/mova-free/tree/main/mlab/tests/vm.rs.groupant)
- **repository commit:** `855da7bd4a7b`

> **Implementation material.** A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.

## Components

| component | label | where |
|---|---|---|
| **approximant** | partial | [approximant](#approximant) |
| **ast** | partial | `syntax.json` |
| **composition** | partial | [composition](#composition) |
| **cost** | symbolic source derived | [invariant](#invariant) |
| **descriptant** | present | [descriptant](#descriptant) |
| **invariant** | partial | [invariant](#invariant) |
| **tests** | executed bounded checks | [tests](#tests) |

## Obernants

The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.

| id | type | label | where |
|---|---|---|---|
| `behavior_complement` | behavior_complement | partial source derived model | [behavior_complement](#behavior-complement) |
| `reverse_reconstruction` | reverse_reconstruction | partial source derived model | [reverse_reconstruction](#reverse-reconstruction) |
| `oracle_independence` | oracle_independence | partial source derived model | [oracle_independence](#oracle-independence) |
| `fault_observation` | fault_observation | partial source derived model | [fault_observation](#fault-observation) |
| `workspace_observation` | workspace_observation | partial source derived model | [workspace_observation](#workspace-observation) |
| `scope_partition` | scope_partition | partial source derived model | [scope_partition](#scope-partition) |

## Parts

- [mlab-tests-vm-synthetic-parity](https://md.groupants.elamur.ai/free/en/mova/mlab/tests/vm.rs.groupant/synthetic-parity.groupant/)
- [mlab-tests-vm-state-gate](https://md.groupants.elamur.ai/free/en/mova/mlab/tests/vm.rs.groupant/state-gate.groupant/)

## Model text


### descriptant

#### mlab-tests-vm

VM/tree equivalence test harness: frozen suites and large edge library coexist with selected bounded synthetic state/fallback/fault checks.

##### Epoch 2026-10-31

Prospective source model preceded test additions. No production semantics changed. Seven legacy files are modeled, with source-scoped fragments for complex files. Retain parse-before-effects versus runtime partial effects, output equality versus correctness, and independent layers routing as distinct observations.

##### Limits

Partial lexical syntax, no macro expansion or semantic resolution. Finite synthetic CPU checks are not a proof. Frozen suites, corpus, teacher, GPU, allocation exhaustion and host IO failure injection were not run. No useful executable percent surrogate for categorical control/effects; unsupported gap, no 1/2/5/10% claim.

### approximant

#### Forward relation

run creates capture interpreter with vm/fault then returns output and state. Selected wave30 tests assert expected bytes, tree/VM parity, fallback counters, parse/runtime workspace behavior and fail-fast fault mismatch.

##### Domain

Valid source-generated AST/values within memory and integer/index limits; deterministic bounded synthetic observations. Arbitrary public malformed representations are outside safety claims.

##### Executable approximant gap

Exact categorical state/dispatch behavior has no supported percentage-error surrogate here.

### invariant

#### Invariant

Selected synthetic tests use memory filesystem and finite small loops; frozen suite and EDGE recursion functions remain unexecuted in this epoch.

##### Cost

Selected fixtures bounded by seven tiny programs plus state/fault cases. Existing frozen and recursion tests have separate unmeasured costs; no whole-harness coverage claim.

### composition

#### Parent composition

run helper invokes actual Interp. Synthetic-parity asserts independent expected strings then engine agreement; state-gate constrains persistence and gate prefix stopping. Frozen suite and EDGE sections are separate unexecuted paths.

##### Limits

Partial lexical syntax, no macro expansion or semantic resolution. Finite synthetic CPU checks are not a proof. Frozen suites, corpus, teacher, GPU, allocation exhaustion and host IO failure injection were not run. No useful executable percent surrogate for categorical control/effects; unsupported gap, no 1/2/5/10% claim.

### models

## Typed models

### behavior_complement

Successful selected checks exclude wrong expected bytes on their fixtures, not all possible VM divergence.

### reverse_reconstruction

Green result admits many implementations agreeing on finite fixtures; outputs cannot reconstruct arbitrary code.

### oracle_independence

Synthetic expected strings constrain both implementations; tree parity by itself is insufficient.

### fault_observation

x=2;y=3;disp(x+y) yields tree5 versus faulty VM6 and gate stops before second scenario.

### workspace_observation

Parse failure preserves x7; runtime failure preserves prefix x9; take_output drains capture.

### scope_partition

Frozen suites and recursion-heavy EDGE are present but excluded from selected command set.


### tests

#### Executed checks — 2026-10-31

Selected exact names: wave30_bounded_state_and_fallback, wave30_parse_runtime_and_output_state, wave30_synthetic_gate_fail_fast, vm_workspace_is_visible_after_run. All selected native commands ran twice debug and twice release with matching sorted named outcomes (12 distinct tests, 48 positive executions across subsystem). Five compiled assertion mutants fail with exit101; restored byte-exactly and rerun green. Per-source associations appear in external source-test-map.json.

Controls change expected parse state, VM persisted value, suite factory count, SHA known digest and routing tie winner. These are compiled assertion controls exercising real code, not claims of implementation-mutant completeness. lib.rs is compile/type identity evidence only.

No frozen suites, Monte Carlo or recursion-heavy EDGE runs. No speed claim. Scoped Clippy limits retained externally; lexical syntax generated twice identically.