---
title: "math-tests-understand — Mova code model"
description: "Mova code model of math/tests/understand.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/math/tests/understand.rs.groupant/"
---
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# math-tests-understand

The groupant beside math/tests/understand.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:** [`math/tests/understand.rs`](https://github.com/ElamurAI/mova-free/blob/main/math/tests/understand.rs)
- **source SHA-256:** `488f55c7cff6abba…`
- **repository folder:** [`math/tests/understand.rs.groupant`](https://github.com/ElamurAI/mova-free/tree/main/math/tests/understand.rs.groupant)
- **repository commit:** `48f2e6f74146`

> **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) |
| **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) |
| `effect_boundary` | effect_boundary | partial source derived model | [effect_boundary](#effect-boundary) |
| `skip_observation` | skip_observation | partial source derived model | [skip_observation](#skip-observation) |
| `temporary_resource` | temporary_resource | partial source derived model | [temporary_resource](#temporary-resource) |
| `validation_scope` | validation_scope | partial source derived model | [validation_scope](#validation-scope) |

## Model text


### descriptant

#### math-tests-understand

Model-gated English fixtures and bounded missing-path guard.

Epoch 2026-10-31: source-derived partial model; prospective hypotheses retained before changes. Existing behavior unchanged except test helper path extraction. New bounded fixtures avoid annotated text/model/corpus/teacher paths. Child scopes use the parent syntax projection; lexical AST has no macro expansion or semantic resolution. Numeric thresholds and adapter differences are observations, not mathematical correctness proofs.

### approximant

#### Forward relation

load resolves path then load_path existence check; missing returns None before Annotator load; present invokes loader and expect. Original tests return on None; frozen TSV read occurs only after successful load.

##### Domain

Original passing early-return tests are skips, not semantic evidence. New test creates fresh empty temp dir, asserts absent child then removes; no environment mutation.

##### Executable approximant gap

No useful measured percentage surrogate is supplied for these categorical parse/search/effect observations. Supported future caps are 1%, 2%, 5%, 10% only, requiring an explicit metric and reference comparison. No speed or accuracy guarantee follows.

### invariant

#### Invariants and cost

Original passing early-return tests are skips, not semantic evidence. New test creates fresh empty temp dir, asserts absent child then removes; no environment mutation.

##### Cost

Metadata check and diagnostic; synthetic test adds directory create/remove. Full original model/annotation/frozen-fixture costs unexecuted.

Allocation failure, deep recursion, malformed public structures and universal numerical bounds are not verified.

### composition

#### Scoped composition

Model-gated English fixtures and bounded missing-path guard.

load resolves path then load_path existence check; missing returns None before Annotator load; present invokes loader and expect. Original tests return on None; frozen TSV read occurs only after successful load.

load_path guards actual Understander load before ans/eval; original full fixtures and suite remain unexecuted. Missing-file guard coverage is not English understanding.

### models

## Typed relations

### behavior_complement

Missing path excludes loading/evaluation/suite read; existing invalid model may panic, untested.

### reverse_reconstruction

None compatible with absent paths and other exists=false causes; output cannot recover model state or parsed text.

### effect_boundary

Existence precedes model load, frozen TSV follows successful load.

### skip_observation

Four original tests may pass by skip; none ran.

### temporary_resource

create_dir is exclusive; prior directory causes failure. Negative assertion control may need cleanup.

### validation_scope

Only exact wave28_missing_path_skips_before_model_load integration filter ran.

### tests

#### Source execution evidence

Safe command: cargo test -p math --test understand wave28_missing_path_skips_before_model_load -- --exact --test-threads=1

Named outcomes (twice debug, twice release; sorted names equal; exits0):

```text
test wave28_missing_path_skips_before_model_load ... ok
```

One compiled assertion control for this source: compilation0, false expectation test101, exact byte restore, focused positive rerun0. These are actual source assertions, not copied implementations or semantic proof. Controls ran before rustfmt-only test-block formatting.

Only actual load_path missing-file branch. Original four English/model/frozen-suite tests excluded.

Strict math lib Clippy reports113 pre-existing production lints. No executable percentage surrogate, speed claim, model/corpus/teacher/GPU/full-school or held-out execution.