Add executable candidate resolution property coverage (#533)

[leynos]

Summary

Add generated property coverage for executable candidate contents and lookup
order across UTF-8 layouts, optional CARGO_TARGET_DIR values, and candidate
presence masks.

Strengthen the diagnostic JSON snapshot contract so it proves that generator
version redaction retains unrelated version fields, and document why finite
coverage fully exercises the anchored filter.

Document the generated executable-candidate flow with an accessible Mermaid
sequence diagram in the primary design document.

Closes #533

Review walkthrough

• Start with the executable locator properties, which reconstruct expected candidate paths independently and verifies first-match and missing-diagnostic behaviour.
• Then review the diagnostic JSON test, which keeps version fields before and after the Netsuke generator block visible.
• Review the design-document sequence, which supplies both a screen-reader description and Figure caption.
• Finish with the snapshot testing guide, which records the finite-domain rationale.

Validation

• cargo fmt --all
• make check-fmt
• make markdownlint
• make nixie
• make lint
• make doc-coverage (98.98%)
• cargo test -p test_support netsuke
• cargo test snapshot_filter_preserves_versions_outside_the_generator_block
• make test (2,450 nextest tests; doctests passed)
• coderabbit review --agent --uncommitted --include-untracked --base origin/main (0 findings)
• coderabbit review --agent --uncommitted --base origin/main (design-document update: 0 findings)

References

• Issue #533
• Preceding PR #532
• Lody session

Summary by Sourcery

Expand executable locator and diagnostic snapshot coverage while documenting the candidate-resolution flow and test rationale.

New Features:

• Add generated property coverage for executable candidate path ordering, first-match resolution, optional target directories, and missing-candidate diagnostics across valid UTF-8 layouts.

Bug Fixes:

• Strengthen diagnostic JSON snapshot coverage to ensure unrelated version fields remain visible when generator versions are redacted.

Enhancements:

• Document the executable-candidate resolution flow with an accessible Mermaid sequence diagram and clarify the finite-domain rationale for snapshot filter coverage.
• Clarify the separation between fixed locator regression tests and generated property coverage in the developers' guide.

Documentation:

• Document executable locator property coverage, resolution behavior, and the generated candidate flow in the design and developer documentation.
• Explain why the fixed diagnostic snapshot fully exercises the anchored filter while property tests vary valid generator versions.

Tests:

• Add property tests covering candidate contents and lookup order across profiles, target triples, optional CARGO_TARGET_DIR values, and all candidate presence masks.
• Extend diagnostic JSON snapshot coverage to preserve version fields outside the Netsuke generator block.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0fb27d3 and 1aeea2c.

📒 Files selected for processing (3)

• docs/developers-guide.md
• docs/netsuke-design.md
• test_support/src/netsuke/locator/tests/locator_property_tests.rs

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Summary

• Add proptest coverage for executable candidate generation and lookup ordering across valid UTF-8 layouts, optional CARGO_TARGET_DIR, and candidate-presence masks.
• Verify primary, profile-fallback, target-triple-fallback, and missing-candidate cases, including complete missing-candidate diagnostics.
• Strengthen diagnostic JSON snapshot coverage to preserve unrelated version fields while redacting only the Netsuke generator version.
• Document the finite coverage rationale for the anchored filter in Snapshot testing in Netsuke.
• Add locator guidance and an accessible Mermaid sequence diagram in Netsuke design.
• Run formatting, linting, documentation checks, focused tests, workspace tests, doctests, and CodeRabbit reviews.

Walkthrough

The changes add property-based tests for Netsuke executable candidate generation and lookup diagnostics. They also extend diagnostic JSON snapshot coverage and documentation to verify that only the Netsuke generator version is redacted.

Changes

Validation coverage

Layer / File(s)	Summary
Executable lookup property coverage test_support/src/netsuke/..., docs/netsuke-design.md, docs/developers-guide.md	Add generators and property tests for candidate paths, lookup order, target directories, first-match selection, and missing-candidate diagnostics. Wire the tests into the Netsuke locator test module and document the coverage.
Diagnostic snapshot filter validation src/diagnostic_json_tests.rs, docs/snapshot-testing-in-netsuke-using-insta.md	Preserve an unrelated schema.version value while redacting the Netsuke generator version. Document the anchored regular expression and finite fixture coverage.

Suggested labels: Issue

Poem

Add paths and test their order
Check each target and profile border
Select the first executable found
List every missing path when none is around
Preserve unrelated version data
Redact only the Netsuke generator metadata
Keep the snapshot result precise

Merge Risk: ⚪ Minimal · up to 1aeea

This change expands executable-candidate and diagnostic snapshot coverage and documents the related behavior; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 20

✅ Passed checks (20 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change and includes the linked issue number (#533).
Description check	✅ Passed	The description directly covers the property-based tests, diagnostic snapshot coverage, documentation changes, and validation for issue #533.
Linked Issues check	✅ Passed	The changes satisfy issue #533. They add generated coverage for candidate paths, lookup order, target-directory variants, presence masks, fallback selection, and missing-candidate diagnostics. They al…
Out of Scope Changes check	✅ Passed	All changes support the linked issue. The additional diagnostic test updates and documentation explain or verify the required snapshot-filter and executable-resolution behaviour.
Docstring Coverage	✅ Passed	Docstring coverage is 90.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 3 files. (2 skipped: 2 …
Testing (Overall)	✅ Passed	Accept the testing coverage. The diff adds no production locator or snapshot-filter behaviour; it wires in active test modules and adds focused coverage. The property tests independently build expecte…
User-Facing Documentation	✅ Passed	Mark this check PASS. The pull request adds test-only coverage and developer-facing documentation. The locator property module is under #[cfg(test)], and the diagnostic JSON change is in a `#[cfg(te…
Developer Documentation	✅ Passed	Pass the Developer documentation check. The pull request changes only test support, diagnostic test coverage, and documentation. No public API, dependency, build requirement, roadmap item, execplan, o…
Module-Level Documentation	✅ Passed	Accept the change. Every Rust module changed or added by the pull request has module-level documentation. src/diagnostic_json_tests.rs explains the diagnostic-schema test purpose and the anchored-fi…
Testing (Unit And Behavioural)	✅ Passed	PASS. Accept the added coverage. The pull request adds meaningful property tests for candidate paths, optional CARGO_TARGET_DIR, profile and target-triple fallbacks, all candidate-presence masks, fi…
Testing (Property / Proof)	✅ Passed	Pass the testing check. The PR introduces substantive Rust proptest coverage for generated UTF-8 path components, optional CARGO_TARGET_DIR, candidate order, all three-candidate presence masks, fi…
Testing (Compile-Time / Ui)	✅ Passed	Mark the check PASS. The diff introduces no compile-time API or implementation behaviour. It adds a private #[cfg(test)] child module and documentation, so a trybuild test is not applicable. The str…
Unit Architecture	✅ Passed	Keep the architecture unchanged. The diff introduces no production implementation changes. The Rust changes add a diagnostic test, a #[cfg(test)] module declaration, and property tests. The property…
Domain Architecture	✅ Passed	PASS: The pull request changes only documentation and test/support code. The new locator properties live in the private test_support::netsuke::locator module, which already owns filesystem probing a…
Observability	✅ Passed	The pull-request diff from the inferred base changes six files: five documentation or test files and one new property-test module. The Rust diff only adds `snapshot_filter_preserves_versions_outside_t…
Security And Privacy	✅ Passed	Pass the Security and Privacy check. The PR changes documentation and test code only. The new locator module is included under #[cfg(test)]; it uses a mocked CARGO_TARGET_DIR, temporary directorie…
Performance And Resource Use	✅ Passed	PASS: The pull request adds only documentation, a deterministic snapshot fixture, and a #[cfg(test)] property-test module. The production locator algorithm is unchanged. Its candidate list remains c…
Concurrency And State	✅ Passed	Mark this check PASS. Against origin/main, the pull request changes only documentation and synchronous test code. The new locator properties use per-case tempfile::TempDir paths, local MockEnv i…
Architectural Complexity And Maintainability	✅ Passed	Keep this change. The PR adds no production abstraction, trait, service layer, registry, macro, dependency, or public API. It adds one private test child module with a clear boundary for the required …
Rust Compiler Lint Integrity	✅ Passed	Pass the Rust Compiler Lint Integrity check. The PR adds no #[allow] or broad #[expect] lint suppression, no artificial usage anchor, and no new .clone() call. The new property-test module is li…

Full details: Linked Issues check

Explanation

The changes satisfy issue #533. They add generated coverage for candidate paths, lookup order, target-directory variants, presence masks, fallback selection, and missing-candidate diagnostics. They also verify selective version redaction and document finite coverage.

Full details: Docstring Coverage

Explanation

Docstring coverage is 90.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 3 files. (2 skipped: 2 unsupported.)

Full details: Testing (Overall)

Explanation

Accept the testing coverage. The diff adds no production locator or snapshot-filter behaviour; it wires in active test modules and adds focused coverage. The property tests independently build expected candidate paths, vary UTF-8-safe components and optional CARGO_TARGET_DIR, create real candidate files, verify first-match selection, and check every missing candidate in diagnostics. Existing tests exhaust the three-candidate presence masks and named layouts. The inline snapshot test retains versions outside the Netsuke generator and redacts only the generator version, so it fails for a removed filter, an inverted filter, or broad version redaction.

Full details: User-Facing Documentation

Explanation

Mark this check PASS. The pull request adds test-only coverage and developer-facing documentation. The locator property module is under #[cfg(test)], and the diagnostic JSON change is in a #[cfg(test)] module. No production behaviour or user-facing functionality changes. docs/users-guide.md is unchanged, so no user-guide update is required.

Full details: Developer Documentation

Explanation

Pass the Developer documentation check. The pull request changes only test support, diagnostic test coverage, and documentation. No public API, dependency, build requirement, roadmap item, execplan, or locale-specific documentation changed. docs/developers-guide.md documents the private locator boundary, candidate order, fallback behaviour, and new property-test module. docs/netsuke-design.md records the executable-candidate flow and includes an accessible Mermaid sequence diagram. The snapshot-testing guide and test module document the anchored filter and its finite-coverage rationale. No ADR update is required because the pull request introduces no architectural decision or system-design change.

Full details: Module-Level Documentation

Explanation

Accept the change. Every Rust module changed or added by the pull request has module-level documentation. src/diagnostic_json_tests.rs explains the diagnostic-schema test purpose and the anchored-filter coverage. test_support/src/netsuke/locator/tests/locator_property_tests.rs explains the property-test purpose, utility, and relationship to the fixed tests in locator.rs. The existing locator and nested tests modules also carry documentation that explains their purpose and relationship to test_support::netsuke. The remaining changed files contain documentation only, not Rust modules.

Full details: Testing (Unit And Behavioural)

Explanation

PASS. Accept the added coverage. The pull request adds meaningful property tests for candidate paths, optional CARGO_TARGET_DIR, profile and target-triple fallbacks, all candidate-presence masks, first-match selection, and missing-candidate diagnostics. Existing tests also cover filesystem errors and fixed Cargo layouts. The diagnostic snapshot fixture keeps unrelated version fields before and after the generator block. The diff changes no production behaviour, so no additional end-to-end workflow test is required.

Full details: Testing (Property / Proof)

Explanation

Pass the testing check. The PR introduces substantive Rust proptest coverage for generated UTF-8 path components, optional CARGO_TARGET_DIR, candidate order, all three-candidate presence masks, first-match resolution, and missing-candidate diagnostics. The candidate-list property reconstructs expected paths independently and asserts content and order. The lookup property stages candidates and verifies the first present path or every attempted path in the error. The diagnostic snapshot change uses a focused fixture with unrelated version fields before and after the anchored generator block, with a documented finite-coverage rationale for the single non-branching regular expression. No introduced invariant lacks appropriate property or proof coverage.

Full details: Testing (Compile-Time / Ui)

Explanation

Mark the check PASS. The diff introduces no compile-time API or implementation behaviour. It adds a private #[cfg(test)] child module and documentation, so a trybuild test is not applicable. The structured diagnostic output receives a focused inline insta snapshot: it keeps schema.version and tool.version visible, redacts only the Netsuke generator version, and asserts the generator name. The existing diagnostic snapshots also use the shared version filter. The locator properties use semantic assertions for dynamically generated absolute paths and diagnostics, which avoids brittle snapshots for temporary filenames. No secret or PII redaction is introduced.

Full details: Unit Architecture

Explanation

Keep the architecture unchanged. The diff introduces no production implementation changes. The Rust changes add a diagnostic test, a #[cfg(test)] module declaration, and property tests. The property tests pass an injected MockEnv to candidate_paths and netsuke_executable_from; the locator performs only its existing explicit try_is_file read and returns Result. TempDir and touch write only test fixtures before the query. No new command, network call, clock, global state, or hidden dependency is introduced. The documentation changes add no runtime behaviour.

Full details: Domain Architecture

Explanation

PASS: The pull request changes only documentation and test/support code. The new locator properties live in the private test_support::netsuke::locator module, which already owns filesystem probing and injected CARGO_TARGET_DIR handling. The diagnostic change is confined to #[cfg(test)] code. No core domain model, command, repository, adapter boundary, or production domain logic changes. Therefore the pull request introduces no stated domain-architecture failure.

Full details: Observability

Explanation

The pull-request diff from the inferred base changes six files: five documentation or test files and one new property-test module. The Rust diff only adds snapshot_filter_preserves_versions_outside_the_generator_block, registers locator_property_tests, and adds generated test helpers and assertions. No production operational behaviour changes, so no new logs, metrics, tracing, or alerts are required by this check.

Full details: Security And Privacy

Explanation

Pass the Security and Privacy check. The PR changes documentation and test code only. The new locator module is included under #[cfg(test)]; it uses a mocked CARGO_TARGET_DIR, temporary directories, and constrained generated path components. It does not use secrets, credentials, commands, network access, or broader permissions. The diagnostic fixture contains fixed fake version strings and the snapshot test runs only in the test module. The existing locator diagnostic and snapshot-filter implementation are unchanged, so no new exposure or trust-boundary risk is introduced.

Full details: Performance And Resource Use

Explanation

PASS: The pull request adds only documentation, a deterministic snapshot fixture, and a #[cfg(test)] property-test module. The production locator algorithm is unchanged. Its candidate list remains capped at three paths, and its existing lookup loop performs at most three metadata probes. Generated test components are limited to nine characters, the presence mask has eight values, and each test case stages only a bounded number of files. The new diagnostic fixture is a fixed-size string. No unbounded collection, recursive walk, retry loop, process execution, or blocking production hot-path work is introduced.

Full details: Concurrency And State

Explanation

Mark this check PASS. Against origin/main, the pull request changes only documentation and synchronous test code. The new locator properties use per-case tempfile::TempDir paths, local MockEnv instances, and scoped filesystem probes. Structural checks found no spawned tasks, async functions, locks, atomics, channels, or process-wide environment mutation. The tests explicitly verify candidate lookup order, first-match selection, and complete missing-candidate diagnostics. No custom-check failure condition was introduced.

Full details: Architectural Complexity And Maintainability

Explanation

Keep this change. The PR adds no production abstraction, trait, service layer, registry, macro, dependency, or public API. It adds one private test child module with a clear boundary for the required generated locator coverage. The module reuses existing locator fixtures and proptest, while its small generators directly model the required path cases. The snapshot change remains a focused fixture and documentation update. The Mermaid diagram and guide entries document existing behaviour rather than introduce architecture. The diff is clean and adds no dependency edges.

Full details: Rust Compiler Lint Integrity

Explanation

Pass the Rust Compiler Lint Integrity check. The PR adds no #[allow] or broad #[expect] lint suppression, no artificial usage anchor, and no new .clone() call. The new property-test module is limited to #[cfg(test)], and its constants, helpers, imports, and locator functions have real test call sites. The only locator clone is pre-existing in netsuke_executable_from and is unchanged by this PR.

✨ Finishing Touches 💡 1

⚔️ Resolve merge conflicts 💡

• Resolve merge conflict in branch issue-533-add-property-based-coverage-for-executable-candidate-resolution

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-533-add-property-based-coverage-for-executable-candidate-resolution

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Reviewer's Guide

The PR adds property-based coverage for executable locator candidate ordering and first-match behavior across generated UTF-8 layouts, optional CARGO_TARGET_DIR values, and all candidate presence masks. It also strengthens and documents diagnostic snapshot filtering to prove only the Netsuke generator version is redacted while unrelated version fields remain visible.

Sequence diagram for executable candidate resolution

sequenceDiagram
    participant PropertyTest
    participant Locator
    participant Filesystem
    participant Diagnostic

    PropertyTest->>Filesystem: create candidate paths from generated layout
    PropertyTest->>Locator: locate_executable()
    Locator->>Filesystem: check candidates in lookup order
    Filesystem-->>Locator: candidate presence
    alt executable candidate exists
        Locator-->>PropertyTest: first matching path
    else no candidate exists
        Locator->>Diagnostic: build missing-candidate diagnostic
        Diagnostic-->>PropertyTest: missing diagnostic
    end
    PropertyTest->>PropertyTest: verify independently reconstructed result

Loading

Sequence diagram for diagnostic JSON version filtering

sequenceDiagram
    participant Test
    participant SnapshotSettings
    participant Filter
    participant Snapshot

    Test->>SnapshotSettings: diagnostic_json_snapshot_settings()
    SnapshotSettings->>Filter: apply anchored generator-version filter
    Filter->>Filter: redact Netsuke generator version
    Filter-->>Snapshot: filtered diagnostic JSON
    Snapshot-->>Test: snapshot
    Test->>Test: verify unrelated version fields remain visible

Loading

Flow diagram for finite executable locator coverage

flowchart LR
    Layout["Generated UTF-8 layout"] --> TargetDir["Optional CARGO_TARGET_DIR"]
    TargetDir --> Mask["Candidate presence mask"]
    Mask --> Candidates["Executable candidates in lookup order"]
    Candidates --> FirstMatch["First present candidate"]
    Candidates --> Missing["No candidate diagnostic"]

Loading

File-Level Changes

Change	Details	Files
Adds generated property coverage for executable candidate construction and resolution across UTF-8 layouts, target-directory configurations, and candidate presence combinations.	Generates valid root, profile, target-triple, and optional target-directory components. Independently reconstructs and verifies documented candidate ordering and contents. Uses three-bit presence masks to verify first-present resolution and missing-candidate diagnostics.	test_support/src/netsuke/locator/tests/locator_property_tests.rs test_support/src/netsuke/locator.rs
Strengthens diagnostic JSON snapshot coverage to verify version redaction is scoped to the Netsuke generator block.	Adds an unrelated schema version before the generator block and preserves it in the snapshot. Documents that the anchored, non-branching filter is fully exercised by the fixed example.	src/diagnostic_json_tests.rs docs/snapshot-testing-in-netsuke-using-insta.md

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#533	Add substantive property-based coverage for executable candidate generation and lookup ordering across generated UTF-8 path components, optional CARGO_TARGET_DIR values, candidate-presence combinations, and missing-candidate diagnostics.	✅
#533	Verify that executable resolution selects the first existing candidate according to the documented primary, profile-fallback, and target-triple-fallback order, while asserting the generated candidate paths.	✅
#533	Add focused coverage or a justified finite-coverage explanation for diagnostic JSON filtering, proving that only the Netsuke generator version is redacted and unrelated version fields are preserved.	✅

Possibly linked issues

• Add property-based coverage for executable candidate resolution #533: The PR adds the requested proptest coverage and validates selective generator-version redaction, directly addressing issue Add property-based coverage for executable candidate resolution #533.

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Inline comments:
In `@docs/netsuke-design.md`:
- Line 2332: Update the PropertyTest-to-Locator diagram label to replace
locate_executable() with the actual relevant API name, netsuke_executable_from
or netsuke_executable, or describe the operation without a function-call name;
keep the diagram aligned with the implementation.

In `@test_support/src/netsuke/locator/tests/locator_property_tests.rs`:
- Around line 32-35: Update target_dir_component or the presence-mask property
test so layouts where the triple fallback aliases the primary candidate,
especially target directory component "build", are excluded from this mask
model. Preserve the existing first_present expectation for non-aliased candidate
layouts.

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ℹ️ Review info

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Configuration used: Organization UI

Review profile: ASSERTIVE

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Run ID: 55a8fc86-3b93-4c9e-8f80-d7589c480768

📥 Commits

Reviewing files that changed from the base of the PR and between ef205b6 and 0fb27d3.

📒 Files selected for processing (5)

• docs/netsuke-design.md
• docs/snapshot-testing-in-netsuke-using-insta.md
• src/diagnostic_json_tests.rs
• test_support/src/netsuke/locator.rs
• test_support/src/netsuke/locator/tests/locator_property_tests.rs

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