---
title: "wasi-mlab-tests — Mova code model"
description: "Mova code model of wasi-host/tests/mlab.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/wasi-host/tests/mlab.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**

This page as HTML: <https://groupants.elamur.ai/free/en/mova/wasi-host/tests/mlab.rs.groupant/>

# wasi-mlab-tests

The groupant beside wasi-host/tests/mlab.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:** [`wasi-host/tests/mlab.rs`](https://github.com/ElamurAI/mova-free/blob/main/wasi-host/tests/mlab.rs)
- **source SHA-256:** `e3b35b1a315b6d99…`
- **repository folder:** [`wasi-host/tests/mlab.rs.groupant`](https://github.com/ElamurAI/mova-free/tree/main/wasi-host/tests/mlab.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) |
| `freshness_projection` | freshness_projection | partial source derived model | [freshness_projection](#freshness-projection) |
| `frozen_exclusion` | frozen_exclusion | partial source derived model | [frozen_exclusion](#frozen-exclusion) |
| `host_cache` | host_cache | partial source derived model | [host_cache](#host-cache) |
| `test_effect_boundary` | test_effect_boundary | partial source derived model | [test_effect_boundary](#test-effect-boundary) |

## Parts

- [wasi-freshness](https://md.groupants.elamur.ai/free/en/mova/wasi-host/tests/mlab.rs.groupant/wasi-freshness.groupant/)

## Model text


### descriptant

#### wasi-mlab-tests

Integration harness binds external suite texts, checks wasm freshness against mlab/src and vfs/src, caches Host and defines native/guest comparisons. Wave31 executes only two added synthetic tests: newest_mtime isolated tree and actual CLI with tiny modules/import/export/journal. Legacy mlab guest/frozen tests remain excluded.

##### Epoch 2026-10-31

Prospective review recorded before edits. Source review found late output FAULT effects and weaker-than-capability rights metadata; these are modeled as current behavior rather than silently repaired. Only bounded new test blocks were added; production code remains unchanged. Actual finite results and exact restoration receipts live under $MOVA_DATA/runs/octopus-wave31-wasi-2026-10-31. No full mlab guest, frozen suite, GPU or corpus run. This node retains its scoped observations for future refinement.

### approximant

#### Forward relation

Integration harness binds external suite texts, checks wasm freshness against mlab/src and vfs/src, caches Host and defines native/guest comparisons. Wave31 executes only two added synthetic tests: newest_mtime isolated tree and actual CLI with tiny modules/import/export/journal. Legacy mlab guest/frozen tests remain excluded.

Scope: `wasi-mlab-tests`. State and transitions follow the authoritative source, including partial effects before errors. No executable approximate replacement is attached: categorical errno/effects and module execution lack a useful validated percentage metric; future numerical profiles may only use1/2/5/10% caps after domain/reference evidence.

### invariant

#### Invariant and cost

Integration harness binds external suite texts, checks wasm freshness against mlab/src and vfs/src, caches Host and defines native/guest comparisons. Wave31 executes only two added synthetic tests: newest_mtime isolated tree and actual CLI with tiny modules/import/export/journal. Legacy mlab guest/frozen tests remain excluded.

The invariant is conditional on the admitted transition: Helper-only wave31 results exclude neither frozen-suite divergences nor stale wasm, since those paths are not run.

Cost: Recursive metadata O(entries+depth stack); full tests have external native/wasm costs not executed. Helper test2 files/one subdir.

No wall-time gain, universal resource bound or atomic rollback is inferred. External Vfs/wasmi/native-mlab work remains separately charged.

### composition

#### Composition

Integration harness binds external suite texts, checks wasm freshness against mlab/src and vfs/src, caches Host and defines native/guest comparisons. Wave31 executes only two added synthetic tests: newest_mtime isolated tree and actual CLI with tiny modules/import/export/journal. Legacy mlab guest/frozen tests remain excluded.

Immediate fragments partition selected mechanisms; their byte ranges refer to this single source and reuse its syntax projection. Memory helper success is a precondition for ABI transport, not proof that all linker wrappers dispatch correctly. WASI path/read/write helpers call real Vfs; mlab remains an external reference. Remaining top-level definitions and test bodies stay covered only by the parent source model.

### models

## Typed model catalog

### behavior_complement

Subject: `wasi-host/tests/mlab.rs` at SHA-256 `e3b35b1a315b6d995fd3cb8e590209d9f57141b89d9def132cd733f31d8f2db8`, scope `wasi-mlab-tests`. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Helper-only wave31 results exclude neither frozen-suite divergences nor stale wasm, since those paths are not run.

Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.

### reverse_reconstruction

Subject: `wasi-host/tests/mlab.rs` at SHA-256 `e3b35b1a315b6d995fd3cb8e590209d9f57141b89d9def132cd733f31d8f2db8`, scope `wasi-mlab-tests`. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Passing freshness means artifact mtime>=maximum leaf mtime in two trees, not reproducible build identity. Output equality permits differing states; la18 divergence is explicitly expected by legacy suite.

Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.

### freshness_projection

Subject: `wasi-host/tests/mlab.rs` at SHA-256 `e3b35b1a315b6d995fd3cb8e590209d9f57141b89d9def132cd733f31d8f2db8`, scope `wasi-mlab-tests`. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Only mlab/src and vfs/src checked, not Cargo config/dependencies; timestamp ordering is weaker than source hashing.

Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.

### frozen_exclusion

Subject: `wasi-host/tests/mlab.rs` at SHA-256 `e3b35b1a315b6d995fd3cb8e590209d9f57141b89d9def132cd733f31d8f2db8`, scope `wasi-mlab-tests`. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Legacy fixed250/249 and25-file scenarios not executed; no confirmation of those expectations this epoch.

Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.

### host_cache

Subject: `wasi-host/tests/mlab.rs` at SHA-256 `e3b35b1a315b6d995fd3cb8e590209d9f57141b89d9def132cd733f31d8f2db8`, scope `wasi-mlab-tests`. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: OnceLock keeps one Host across guest calls, while each call supplies fresh Vfs unless explicitly passed; engine run creates fresh instance.

Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.

### test_effect_boundary

Subject: `wasi-host/tests/mlab.rs` at SHA-256 `e3b35b1a315b6d995fd3cb8e590209d9f57141b89d9def132cd733f31d8f2db8`, scope `wasi-mlab-tests`. Domain: the source transition and bounded fixtures described in approximant.md; readable valid host resources where required. Observation: returned values, byte coordinates, state/effect order, not total-system semantics. Operator/relation: Wave31 creates/writes/stats/deletes isolated temporary trees and invokes wasi-run on tiny modules only. No wasm_path, host(), native(), guest() or suite execution.

Status: partial source-derived relation; complement is a scoped exclusion hypothesis, reverse preserves all compatible antecedents described rather than a chosen inverse. Assumptions: production branch order, declared coordinate/resource premises; no completeness claim for untested inputs. Evidence: tests.md distinguishes actual execution from source review; finite observations can falsify but not prove the relation.


### tests

#### Checks and limits

Named actual-source tests run twice per debug/release; exact commands and numeric statuses retained externally. Test success is finite evidence only.

Exact names: wave31_newest_mtime_isolated_tree, wave31_cli_tiny_guest_isolated_effects.

Memory tests bypass linker ABI; tiny empty/unreachable guests exercise engine outcomes only. The CLI test uses isolated import/export/journal fixtures.

Five compiled production/helper-source controls: append offset, virtual clock advance, trap status, CLI export gate and newest-mtime max. Each compiles, fails its selected assertion, restores exact original bytes and passes again. These controls cover their target relations, not every node. No assertion-only mutants. See external source-test-map.json, native-commands.json, verify.rs and numeric/raw receipts in $MOVA_DATA/runs/octopus-wave31-wasi-2026-10-31. The example main and frozen mlab paths are never executed.