Elamur Groupantswasi-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
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 |
| ast | partial | syntax.json |
| composition | partial | composition |
| cost | symbolic source derived | invariant |
| descriptant | present | descriptant |
| invariant | partial | invariant |
| tests | executed bounded checks | 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 |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
freshness_projection | freshness_projection | partial source derived model | freshness_projection |
frozen_exclusion | frozen_exclusion | partial source derived model | frozen_exclusion |
host_cache | host_cache | partial source derived model | host_cache |
test_effect_boundary | test_effect_boundary | partial source derived model | test_effect_boundary |
Parts
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.
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