test: add baseline test for _tools/licenses/infer

[Planeshifter]

Description

This pull request adds a baseline smoke test to @stdlib/_tools/licenses/infer, the sole package in the @stdlib/_tools/licenses/* namespace that previously lacked a test/ directory.

The fix was produced by a cross-package drift audit over the 11 non-autogenerated members of the namespace. Two drift items were applied to infer:

• A test/test.js exercising typeof infer === 'function', mirroring the boilerplate used by 10 of 11 (91%) siblings.
• A "test": "./test" entry under directories in package.json, mirroring 10 of 11 (91%) siblings.

No other corrections survived filtering: the remaining semantic features either had no clear majority across the namespace or were satisfied by every package.

Namespace summary

• Members analyzed: 11 (all non-autogenerated).
• Features with clear majority (≥75%): test/test.js presence, directories.test presence, lib/index.js presence, lib/main.js presence, examples/index.js presence, errorConstruction = format (9/11; outliers header-regexp and infer do not construct errors at all, so this was treated as a false positive and dropped).
• Features without clear majority (excluded from drift analysis): returnKind (6 value / 5 void), os in package.json (6/11), __stdlib__ in package.json (6/11), directories.doc (8/11), README Notes section (8/11), README CLI section (7/11), per-package signatures and validation prologues (each shape unique to the package).

Per outlier package

_tools/licenses/infer

Added test/test.js with a baseline smoke test verifying the main export is a function (91% of @stdlib/_tools/licenses/* siblings carry this test). Added "test": "./test" to directories in package.json for the same reason — 91% conformance across siblings.

Related Issues

This pull request has no related issues.

Questions

No.

Other

Validation

Three-agent validation was run over the candidate corrections:

• Semantic review: confirmed-drift — the @private JSDoc tag on infer's main function is a documentation tic shared across siblings (licenses, insert-header-file-list, etc.) and does not indicate the package is untestable; the module is exported and documented in README.md as a usage-facing API.
• Cross-reference review: confirmed-drift — no test-runner config, ignore pattern, or external reference depends on the file's absence; infer/package.json shows several signs of being incomplete relative to siblings (missing directories.test), consistent with unintentional drift.
• Structural review: confirmed-drift — infer is structurally identical to its tested siblings (lib/index.js re-exporting lib/main.js, a README.md documenting the API, a bin/cli), and the boilerplate smoke test is universally applicable since module.exports is a function.

Deliberately excluded from this PR:

• The errorConstruction "drift" in header-regexp and infer — both packages either delegate validation to a callee or are internal helpers with no thrown errors. There are no error messages to normalize.
• Features without a clear ≥75% majority (returnKind, os, __stdlib__, directories.doc, README Notes/CLI).
• Per-package signature and validation-prologue differences, which reflect genuine semantic differences in what each package does.

Checklist

• Read, understood, and followed the contributing guidelines.

AI Assistance

• Yes
• No

If you answered "yes" above, how did you use AI assistance?

• Code generation (e.g., when writing an implementation or fixing a bug)
• Test/benchmark generation
• Documentation (including examples)
• Research and understanding

Disclosure

This PR was authored by Claude Code as part of an automated cross-package drift detection routine over @stdlib/_tools/licenses/*. The audit identified structural drift via majority vote across 11 sibling packages; the proposed correction was validated by three independent reviewer agents (semantic, cross-reference, structural) before being applied. A human maintainer should promote out of draft after review.

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@stdlib-js/reviewers

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Generated by Claude Code